Replacing the heater gearmotor on a VAZ 2110: installation rules. How to change the gear motor of a VAZ-2112 stove with your own hands

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As you know, the heating system in any car plays a huge role. The domestic car production model VAZ 2110 is no exception. If even one element fails, the functionality of the entire system may be impaired.

Today we will talk about the stove gear motor. It is responsible for closing and opening your heater damper in your car. Opening and closing is determined by signals from the heater control system. This way the air inside the cabin can be cooled or heated as needed.

Geared motors for the VAZ 2110 have one important feature. Depending on the year of manufacture, the configuration of this element differs significantly. Therefore, it is important to determine in advance which gearmotor is on your car before making a purchase and replacement.

Causes of failure

If the gear motor fails, then you will not be able to regulate the temperature inside your car by controlling the heating system.
To check the operation of the element, you can supply electricity from the battery directly to the gear motor in the middle position. The functionality of the controller is checked in a similar way. If it breaks, then it also becomes impossible to regulate the temperature.

Failure of a gearmotor (MR) may be due to the following reasons:

The integrity of the electrical circuit has been compromised. This means that there is no voltage supplied to the motor, and therefore the gearmotor is not able to work properly;
A defect has occurred in the autonomous control unit of the stove. Because of this, the gearbox does not provide air at the temperature required by the driver.

Old sample

Reasons why a gearmotor fails

If this element malfunctions, it is completely impossible to control the car's heater. You can check its functionality after setting the heater regulator to the middle position and applying voltage from the vehicle battery to the terminals of the gearbox electric motor. In good condition it should work. If the opposite is observed, it means that the gearmotor controller, which is responsible for regulating the temperature inside the cabin, has failed. Its serviceability is checked by analogy with a gearbox.

MR often breaks down for the following reasons:

A defective place has arisen in the electrical network of the car, due to which the electric motor of the gearmotor of the VAZ-2112 stove no longer receives voltage, and it cannot function as before.
The autonomous heater control unit received any damage during operation, as a result of which the MR can no longer correctly regulate the air supply in accordance with the temperature set by the driver.
The gear motor shaft position sensor has failed.

Main Culprits

Let's try to find the culprit that may be causing the stove to not work.

temperature sensor

Key to 19

If the sensor works well, the damper will move depending on the value set on the regulator. You can check this by removing the deflectors and observing the movement of the damper.

Checking the operation of the coolant sensor at home with a multimeter

Stove controller

To check the operation of this element, you need to pull it out of its socket. Next, you need to turn on the ignition and turn the temperature switch knob. In this case, you should measure what voltage is on the wires in different positions of the regulator (these are brown and pink wires).

Disassembled stove controller

If everything works properly, then voltage on the wires will appear depending on the position of the switch itself. This voltage should subside on its own within 10-15 seconds after turning the regulator knob. If this does not happen, then the controller is acting up. It can only be completely replaced.

Gearmotor

Gear motor diagram with explanation

Due to the fact that it is out of order, the stove on the VAZ-2112 can also malfunction. It is quite difficult to check the operation of this unit. To do this you need to get into the engine compartment. After removing the sound insulation and frill, you will need to remove the wiper drive. There will be two connectors. The connector to which the brown and pink wires fit will be the connector of the gearmotor.

Initially, you need to check if the wires themselves are broken. To do this, you will also have to check the voltage at the gearmotor connector. If the wires are not broken, then there will be voltage.

To check the condition of the gearbox itself, you need to apply a voltage of 12 V to the connector. When it starts to spin, then everything is in order. If this does not happen, the part will have to be completely changed. If the gearbox spins, but the stove does not work, then the reason must be looked for in the wires and connectors. They may be oxidized.

The heater only works in one position

There are several options here. We'll have to check them all.

Test the wires in the controller. They may break or burn out.
The wires in the relay may have come loose. You need to look for the relay block in the engine compartment.
An additional resistor on the heater housing may burn out. It is he who regulates the speed of the fan.

Checking a new device

To check the functionality of the new damper motor, set the heater position to the blue dot on the left handle. After waiting about 20 seconds, you need to start the engine. The test cannot be carried out without a multimeter. It is necessary to measure the resistance between X1.1 and X1.4. If the new damper motor is functioning correctly, the voltage will be 800-1200 Ohms (controllers 1333.3854, 1303.3854, 1313.3854), 3600-5000 Ohms (models 1323.3854).

Now you need to check the operation of the damper at the red mark. In the first case, the resistance should be at the level of 3200-5000 Ohms, and in the second - at the level of 1200-1600. In some cases, the absence of the required indicator indicates a malfunction of the sensor. Due to the design features, this element cannot be changed individually; as a result, the entire gearmotor must be replaced.

Replacement of micromotor gearbox

To replace an element, you will need to perform several not particularly complex activities. Therefore, it is not at all necessary to go to a service station and pay a lot of money for their services.

First of all, remove the frill.
Next, the vacuum brake booster is dismantled.
After this, you still need to remove the pedal assembly.
Now we begin to dismantle the old micro-gearbox along with the plastic component.
A new micromotor gearbox should be installed in place of the damper sector. There you will see a similar square.

Location of the device
Practice shows that replacing a micro-gearbox does not require special skills, a lot of time or excessive effort. However, never forget to be careful.

But in order to install the damper of your micro-geared motor, you will need to invite an assistant.

First, the contacts are connected to the new micro-gearbox, that is, the motor.
By turning the damper counterclockwise, you turn on the cold air supply.
Turn on the ignition and turn the heater control system (SAUO) sensor to the position directly opposite the blue dot of the regulator.
Or you can do the opposite, that is, check the micro-gear motor by installing the sensor opposite the red dot, and turn the damper all the way clockwise.
The micro-gearbox rotates slightly more than required, so for proper installation it is recommended to use a special lubricant for the square.
Install the motor so that the holes for the screws match.
Now you need the help of your friend, since his task will be to turn the temperature regulator and at the same time press the motor inward.
If the squares match, the replacement of the micromotor reducer can be considered successful. Now the air should flow to the desired temperature inside the cabin.
Don't worry if the square doesn't go the full length of the flap you're using. This is normal when the gear motor goes about a third of the way. This installation will not affect the performance of the system in any way.
Now all that remains is to return the screws to their place and twist the micro-gearbox several times - from the blue mark to the red one, and in the reverse order.
These manipulations will allow the stove to remember what operating range the new gearbox has. Therefore, there will be no problems with its performance in the future.

If everything is done carefully and in accordance with the instructions, when you turn the damper, the micromotor reducer of your stove will not move to the required position. By turning on the device in mode with the “A” icon, control and adjustment will be carried out automatically - with an error of no more than 2 degrees.

Installation

To install the gearmotor, you will need a certain set of tools, which include:

Open-end wrench 10 millimeters;
Crosshead screwdriver;
Spanners.

Don't worry if you're new to doing car repairs yourself. There is nothing complicated about replacing a gearmotor.

Remove the windshield wipers from the fuse to gain access to the device. To do this, you need to dismantle the contact nut and then release the frill.
You will have access to the screws.
Two nuts are unscrewed on the sides of the frill, and then the rubber seal is removed from the electric motor compartment of the gearbox.
Disconnect the damper jabot pipeline by disconnecting it.
Remove the screws that hold the gearbox thermal radiators.
The motor is located on the left in the damper gear box, right next to the brake booster.
Next, you need to unscrew the lower mounting screw and remove the electric motor.
The damper assembly should be carried out strictly in the reverse order. Moreover, do this only after the gearmotor has been installed.

Functionality check

Checking the element consists of the following activities:

First, set the left knob to the blue dot position;
Wait about 15 seconds;
Start the engine;
Disconnect the controller from connector X1 and measure the resistance on two contacts - X1.4 and X1.1.

Depending on the type of controller, the indicators must be appropriate.

Test point	Controllers	Resistance indicators
Position on the blue dot	1303.3854, 1313.3854, 1333.3854	800-1200 Ohm
1323.3854	3600-500 Ohm
Position on the red dot	1303.3854, 1313.3854, 1333.3854	3200-5000 Ohm
1323.3854	1200-1600 Ohm

If checking the micromotor gearbox shows no resistance or it does not change during testing, the shaft position sensor has most likely failed. Alas, you won’t be able to purchase it separately, so you will need to completely change the gearbox. And this is a significant expense.

Installation of gear motor

In order to install the gearmotor on a VAZ 2110, you need the following tools: a Phillips screwdriver and a 10-open-end wrench. Replacing and installing a part such as a gearbox does not require special knowledge and skills; even a beginner can cope with such a task.

To gain access to a part such as a micromotor gearbox, you must first remove the windshield wipers from the fuse. To do this, unscrew the contact nut, and then release the frill and access to the screws will open. Unscrew the two nuts on the sides of the frill and remove the rubber seal from the electric motor compartment of the heater gearbox.

First, the pipeline of the heater damper frill on the VAZ 2110 is disconnected, then the screws holding the thermal radiators of the gearbox are unscrewed. The motor is located in the left compartment of the heater damper gearbox on the VAZ 2110, next to the brake booster. You need to unscrew the two bolts at the top.

Then the screw at the bottom is removed and the electric motor is dismantled. The damper is assembled in exactly the reverse order after the gearmotor is installed.

Sequence of actions when installing the VAZ-2112 heater micromotor gearbox

Replacing a faulty element is within the capabilities of every car owner. The sequence of all stages of work is quite simple; the necessary tools for this are included in the standard set of the machine’s first aid kit, so there is absolutely no need to contact a service workshop. So let's get started:

dismantle the frill;
to get to the micromotor gearbox, you need to remove the pedal block and the vacuum brake booster;
remove the faulty micromotor gearbox and its plastic block;
a serviceable element is installed in the damper sector socket.

General information about the heater damper and gearmotor

Replacing a gearmotor in a VAZ 2110

As you know, a car interior heater is capable of filling the interior not only with warm, but also with cold air. The heater damper regulates the speed at which the desired temperature in the car interior is established.

Note. Before turning on the heater, all doors and windows of the car must be properly closed to create a high degree of internal tightness. Otherwise, the heater will be ineffective during its operation.

List of main functions of the heating damper gearmotor:

maintaining optimal temperature conditions;
The heater damper gear motor is also responsible for the speed of creating the proper temperature regime;
determines the operating efficiency of the heater itself.

Objective reasons that directly indicate the presence of a malfunction of the heating damper and gear motor:

the heater has stopped filling the car interior with cold or hot air;
after 15-20 minutes of operation of the heater, no change in temperature is observed;

Replacement of gear motor VAZ 2110

the rate at which the car interior is filled with appropriate air is too low and the practical effect of the heater’s operation is almost unnoticeable.

Note. The degree of sound insulation of a car interior is an objective indicator of the degree of insulation. Sometimes the problem of inefficient functioning of the heater lies precisely in the low degree of insulation.

Drive problem

Most often, owners of the domestic “ten” are faced with situations regarding the stove when the regulator does not respond to user manipulations. That is, the regulator does not work. Whatever position you choose, either cold or only hot air comes from the air ducts.

There are different reasons for damper failure.

Causes of failure	Characteristic
Micromotor gearbox jammed	This element is responsible for controlling the damper drive
Problem in the control unit	It should be checked in order to understand whether the micromotor gearbox, the damper, or the control unit is at fault
The plastic dampers have moved from their seat and are jammed, making it impossible to control the stove.	This is typical for the old-style VAZ 2110 heater damper, when plastic was still used for this component.

When the gearbox is functioning, but the damper still does not turn, you can hear characteristic sounds - clicks. This indicates that a square shaft rotates inside the socket.

There is only one way to cure such a malfunction - remove the old damper made of plastic with foam insulation, and replace it with a new, modern one. The new type of damper is made of metal, and the seal for it is made of rubber.

When changing the damper, do not forget to check the functionality of the actuator.

How to replace the gear motor of a new VAZ 2110 stove

Procedure:

It is more convenient to work with the windshield wiper removed, but it is not necessary to dismantle it.
Disconnect the two connectors from the gear motor, which is located on the right side of the brake booster.
Remove the three mounting screws.
Remove the gear motor from the heater housing; the heater damper will fall to the “cold” position.
To install a new gearmotor, turn the shaft slightly toward “warm”; to do this, with the ignition off, set the temperature to “hot” and turn on the ignition for one second.
Check whether the shaft fits and whether the gearmotor can be secured into the slot in the damper drive handle. If necessary, turn the shaft again by briefly turning on the ignition.
If you overdid it, turn the shaft to the “cold” position and repeat the operation from the beginning.

Removing the gear motor of the VAZ-2110 heater

To access the micromotor gearbox of the VAZ-2110 heater, regardless of the year of manufacture of the car, you will need to perform several simple operations.

We remove the wipers. They are fastened with two nuts. Raise the protective caps and unscrew the fastening nuts with a 14 mm wrench.
We dismantle the upper protection of the engine compartment - frill. To do this, unscrew the screws with a Phillips screwdriver, some of which are hidden under round plastic plugs.
We remove the sound insulation of the engine shield. It is secured with screws. To dismantle it, you will need to disconnect the coolant supply pipes.
We disconnect the trapezium of the wipers, which is attached to the body with two nuts.

The vacuum brake booster can be removed, but this operation is not necessary. But then, when unscrewing the screws of the gearmotor, you will need a short screwdriver or a ratchet with a screwdriver attachment.

On the left side in the direction of travel of the car, near the partition of the engine shield above the vacuum booster, there is a micro-reducer for controlling the heater damper of the VAZ-2110. Two chips are connected to it. A more massive feature is nutrition. It supplies voltage to the windings of the electric motor. The smaller chip is a control chip, reads the position of the shaft and sends this information to the control unit. Let's disconnect these chips. The power supply may have a metal fixing bracket. Don't forget to lift it up with a flat screwdriver.

The motor, regardless of design, is attached to the stove body with three screws. Unscrew the screws and remove the motor.

VAZ 2110: heater damper gearmotor and replacing it yourself

Gearmotor on a car

The climate of the car is important for every motorist, since this circumstance directly affects the degree of comfort of both passengers and the driver himself. On the VAZ 2110, the heater damper motor regulates the temperature inside the cabin. Of course, the optimal temperature also depends on the time of year. In this regard, there is a practical need to artificially maintain the required temperature inside the car. Often the gear motor deteriorates and there are reasons for this. On a VAZ 2110, replacing the gear motor can be done on your own, and this will be discussed in the article.

Purpose of the gearmotor and its location

In order for the replacement of the heater gear motor in a VAZ 2110 to be successful, you need to know basic information about the unit. It ensures the closing and opening of the heater damper, the process is carried out using signals from the unit.

The configuration of the gearmotor may differ significantly on VAZ 2110 of different years of manufacture.

Depending on the mode set on the handle, warm or cooled air enters the cabin. The unit is located under the hood on the steering wheel side, it is installed next to the brake booster, so finding it is not difficult.

How to repair or replace the gear motor of a VAZ-2110 stove

Normal operation of the VAZ-2110 stove is impossible without the correct functioning of the gearmotor, which is responsible for opening/closing the damper.

As a result of this interaction, the air that enters the car interior is heated/cooled depending on the situation. Therefore, when a stove gear motor needs to be replaced or repaired, you cannot hesitate.

This work can be done with your own hands, without the help of specialists.

How to detect and determine a malfunction

First of all, the car owner notes the impossibility of changing the temperature of the air supplied through the heating system.

To check the condition of the micro-gearbox, it is necessary to supply electricity from the battery to its motor in the middle position.

The functionality of the controller is checked in the same way, which also affects the ability to regulate the air temperature.

The most obvious sign of a non-working gearmotor is a significant decrease in the rate of heating of the interior. If there is no ventilation regulation at all, then we can talk about problems with the heater wiring.

Problems with the operation of the stove are not always caused by the heater damper motor of the VAZ-2110. You need to know about other reasons so as not to attribute them to a non-working gearbox:

inability of the electrical circuit to transmit voltage to the engine;
malfunction in the autonomous control unit of the heating system.

Replacing the gearmotor

In the case when it is necessary to replace the micro-gearbox, it is necessary to follow the work plan given below, for the implementation of which you will need two Phillips screwdrivers (long and short), and a ten-point open-end wrench.

We remove the windshield wipers from the special fuse, which is presented in the form of a rubber cap. But first you need to unscrew the contact nut using a ten key.
We dismantle the frill, which is located in four plugs, which mostly serve a decorative function.
On the side planes of the frill you can see a couple of nuts that will need to be unscrewed.
We look at the electric motor compartment and find a rubber seal that needs to be removed.
To disconnect the pipeline, you will need to unscrew the screws that hold the thermal radiators from the electric motor.
Next to the brake vacuum booster there is a damper motor, which is mounted on three mounting screws.
At this stage, you can dismantle the electric motor by first removing the smallest block. The larger block has a wire fastening.
We install a new gear motor in place of the damper sector.
To assemble the heating damper, we strictly follow the described plan, but all steps are performed in reverse order.

Important practical points

Some difficulties may be associated with the installation of the micro-gear damper. For this work you need to hire an assistant. First you need to connect the contacts to the new motor.

If the heater damper is turned against the clock, cold air is supplied. This means that you need to turn on the car’s ignition and switch the sensor on the heater control system so that it is located opposite the blue dot.

Checking the micromotor gear can be carried out according to the opposite scheme, which involves turning the damper along the clock mechanism and installing the sensor near the red mark. The micromotor gearbox must turn more than it normally does.

The square can be treated with a special lubricant, which will facilitate installation.

When installing the motor, you need to pay attention to the alignment of the holes for the screws. The invited assistant must turn the temperature regulator and press on the electric motor. If the squares coincide, we can talk about a successful replacement of the gearbox, the operation of which will be carried out at a high level.

In some cases, you can observe incomplete insertion of the square along the length of the damper. You shouldn’t get upset ahead of time, because even if the micromotor reducer is only a third of the way in, its functioning will still be at a high level. The gearbox will need to be turned several more times from one mark to another so that the heating system fixes the operating range.

Gearmotor repair

If, however, you still have a desire to repair the gearmotor, and not just replace it with a new one, then the next part of our article will be of interest to you. It’s worth mentioning right away that the details of the new model are significantly different from their predecessors.

Old style part

First of all, let's look at the principle of repairing gear motors on an old-style VAZ-2110. Such a part may have a plastic or metal body. The first option is much easier to work with, but a gear motor in a metal case will be difficult to remove without denting it.

We already know how to dismantle such an element, so let’s proceed directly to disassembling it and identifying faults. We remove the adapter from the shaft, which is inserted into the damper and serves to transmit rotational energy. You can safely pull it towards yourself, since there is no glue or stoppers here.

Advice

There are latches along the entire perimeter of the case. To deal with them, you need to use flat screwdrivers, which need to be driven between the latch tongue and the body. Raise the eyelet quite a bit and insert a second screwdriver next to the latch. The halves will open due to the turning movement. Similar actions will need to be performed several times throughout the entire body.

You need to make sure that small parts that may get lost do not fall out. We completely remove the second half of the housing, pull it up from the axle and remove the three gears. On the second half of the housing there should be an electric motor with a gear and shaft.

When removing the electric motor, you need to pay attention to the worm gear, at the end of which there is a segment responsible for centering the shaft and holding the pair of gears in mesh. The part is small and can easily get lost. The motor housing has a locking screw that prevents the motor from turning inside the housing.

We remove the motor, remove the gears and segment from the shaft. We carefully inspect all parts for breakage and defects. If nothing like this is found, then we will examine the gearmotor further. In the place where the wires are connected, the motor parts are secured. We unbend it with available tools and release the bottom part.

Again, we act carefully and carefully so as not to break or lose anything. Inside there is a permanent magnet, which, due to the magnetic field, holds the motor armature in its place. In order not to cause trouble, you need to take the unit in your hand and press it with your finger on the shaft.

Using the fingers of the other hand, we grab the anchor and separate the motor into parts. Do not grab the windings as they are easily damaged. We see two brushes that are attached to the bottom part. Using a screwdriver, pull the brushes by their holders.

At the end of the armature there is a washer that prevents the brushes from being easily removed. There is no reason to remove the washer.

The armature has three windings, which are subject to careful inspection and ringing with a tester. We also inspect all dismantled elements for critical abrasions, melting, and soot deposits. Reassembling the gearmotor is carried out in the reverse order, carefully and with extreme caution.

New sample part

Dismantling of the new type gearmotor is carried out according to a similar scheme as described above. When the part is in your hands, you need to disassemble the body, which is held in place by clamps. They need to be carefully pryed off with a flat screwdriver.

First of all, you need to examine the motor for any malfunctions. To do this, you need to connect it to the connector located in the engine compartment. The micromotor must be disassembled, for which it will be necessary to bend the pressed side. It is important to note the position in which the cover is located relative to the body.

This will help maintain the correct polarity of the electric motor during assembly.

If you find a fault in the motor, you will need to look for a break. When the part is running, it is necessary to lubricate it and the gears on the gearbox.

note

A silicone-based lubricant is ideal and can be used over a wide temperature range. It may be necessary to replace the damper position sensor; it is worth paying attention to.

Assembly of the part is carried out in strictly reverse order.

Repairing and replacing a heater gear motor is not the easiest job a car owner may encounter. But there is nothing super complicated about this either. If you have the desire, minimal experience and imagination, you can successfully fix the problem with the car heating system and create a comfortable climate in the cabin of your car.

How to detect and determine a malfunction

First of all, the car owner notes the impossibility of changing the temperature of the air supplied through the heating system. To check the condition of the micro-gearbox, it is necessary to supply electricity from the battery to its motor in the middle position. The functionality of the controller is checked in the same way, which also affects the ability to regulate the air temperature.

Problems with the operation of the stove are not always caused by the heater damper motor of the VAZ-2110. You need to know about other reasons so as not to attribute them to a non-working gearbox:

inability of the electrical circuit to transmit voltage to the engine;
malfunction in the autonomous control unit of the heating system.

Dismantling

Disassembled stove
To replace the device, you will have to perform a series of sequential actions. The work is not particularly simple, but doing it yourself is more than possible:

Drain all coolant from the heating system;
Disconnect the battery. To do this, simply remove the negative terminal;
Remove the trim, windshield trim and sound insulation;
Remove the fan from the stove;
Disconnect the vacuum pipe clamps from the heater housing;
Remove the front heater air intake housing. There's definitely no need to rush here. To facilitate dismantling, we recommend removing the dashboard. Inside the cabin, the fasteners that hold the heater are unscrewed, and then raised;
Remove the spring clips, mounting nuts, and front housing;
Disconnect all hoses from the radiator;
Disconnect the rear casing from the heater;
Remove the radiator from the stove.

After these manipulations, you can finally replace the damper.

Functionality check

If you do not want to spend a lot of money on repairing and replacing the device, you need to first check whether such manipulations are required. To do this, you can try to return the displaced damper to its rightful place.

Turn on the ignition;
Switch the regulator to different positions;
Manually move the flap;
This way it can be returned to its original position.

Of course, you first have to dismantle the deflector to gain access to the damper. If this method works, the damper will be able to work again as before, which means it will respond to the regulator.

But this cannot be considered a full-fledged measure for restoring the functionality of the damper, since if the socket is already loosened, the unit will no longer be able to work normally. At first, you will apply the half-measures described above over and over again, but over time you will still have to replace the heater damper on the VAZ 2110.

Pay attention to the conditions under which the damper can be operated. If this happens only manually with the ignition on and the regulator turned to the extreme position, then the cause of the breakdown lies in the micromotor gearbox. Other suspects are the microfan with temperature sensor and the control unit.

If any of these components stops working normally or is completely out of order, then the heater damper will not work on the VAZ 2110. Only its replacement is required. Ignoring the problem will result in even greater repair costs in the future.

Repair/replacement of the micro motor of the VAZ 2110 heater damper gearbox

One of the most common problems with the VAZ 2110, we would even say a “standard” malfunction, is the stove of this car. In our case, the air flow was constantly hot (perhaps constantly cold), and there was no reaction to changes in the position of the stove lever. This is due to the specific design of the heating in the VAZ 2110. It is designed in such a way that there is no tap for supplying coolant to the radiator, and the flow temperature is regulated by operating an air damper (outdoor/radiator). That is, coolant is constantly supplied to the heater radiator.

The entire DIY repair process is described in this photo instruction. And if you are interested in other reasons why the VAZ 2110 stove does not work, read our article.

The first step is to determine the cause of the problem. In almost 90% of cases, the culprit of a “not working stove” or a “constantly working” stove is the air duct damper, or rather its micro gearbox, due to the specific design of the heating on the VAZ 2110.

Therefore, we disassemble the nozzles on the central console, i.e. we take them off.

Next, use the lever to regulate the air supply (we move it to the extreme left and extreme right positions), you need to see if the damper moves.

In our case, the damper really does not respond to the movement of the lever, and it is stuck in one extreme right position.

The image shows the correct operation of the damper. If the damper reacts to the movement of the damper, and if warm or cold air is blowing, then you need to look for a fault in the radiator area.

You can very simply analyze how the automatic control system unit works. Is the control voltage supplied to the gear motor from the automatic control system? Here's the diagram

We connect the tester to terminals x1.2 (pink) and x1.8 (brown). Turn on the ignition. When you move the temperature knob to the highest position, a control voltage of 10 Volts should appear for 10-15 seconds. Further, with each change in the position of the temperature handle to the side position, the polarity of the control voltage should change. In cases where there is no voltage at all, then the automatic control system is not working.

In cases where the stove operates only in extreme positions or there is a suspicion that the gearbox is working properly and its shaft rotates in the damper seat, it is easy to check the serviceability of the damper position sensor. When moving the temperature knob to its extreme positions, the resistance between contacts x1.1 (green) and x1.4 (blue with a purple stripe) should change.

Result: the automatic control system is working properly, it supplies the micro-geared motor with voltage, but the damper does not respond to it.

We dismantle the wipers, unscrew the bolts shown by the arrows. We also unscrew the 2 nuts that are located on the sides. Carefully remove the plastic hook from the hole in the body and remove the frill.

Next, to make it more convenient to remove and install the frill, we cut the tube that serves to supply the washer and insert into it a tube from a cylinder with foam.

Gearbox location.

The gearbox can be removed from this position. It is secured with 3 bolts.

The gearbox has been removed from the vehicle.

Next we proceed to disassemble it.

Using a flat-head screwdriver, carefully bend the latches and separate the two halves.

We connect power from the automatic control system to the motor connector and test whether the motor is working?

In any case, remove the motor and disassemble it.

Trouble-shooting

Checking the cabin air temperature sensor

You can check the serviceability yourself; special skills are not required. Carefully remove the sensor from its original place. We find the contacts on the back side. Using a multimeter, apply a voltage of 1.2V. We set the regulators of the automatic heater control system to the “Min”, “Max” positions. The motor should not be activated.

The second method is to turn off the cabin air sensor. Check fan speed settings. The first speed (“A”) should be inactive.

Video: Heater VAZ 2110, 11, 12. Design and principle of operation.

Checking the proper operation of the automatic control system

The proper operation is checked with a multimeter. The voltage at the terminals of the pink and brown wires is measured, the ignition is activated. Smoothly turn the temperature regulator; the arrow on the multimeter display should show an increase in voltage.

On old-style heaters, at maximum voltage, the controller value remains unchanged. Take this into account so as not to make hasty conclusions about the malfunction of a particular unit.

The cause of controller malfunction may also be deformed dampers. To verify this and eliminate the breakdown, we disassemble the heater.

Prevention of the damper of the heating system of VAZ 2112

To be precise, two dampers are subject to inspection; this is the number of them present in the VAZ 2112. The cold air intake is regulated in the upper part. In the lower part, warm (hot) air is supplied to the car interior. Due to wear on the drive mechanism, the damper opens halfway or partially, the air flow is reduced, and the interior is not heated sufficiently.

Reasons for failure:

biting, jamming during operation, due to the lack of a sufficient amount of lubricant;
a lot of debris, moisture, sand, dirt, which contributed to jamming;
failure of the gear motor damper cable;
numerous layers, rust, corrosion.

The old and new dampers differ only in the type of sealing ring. In the old ones it is plastic with foam rubber, in the new ones it is a metal seal with rubber. If you can’t hear the movement of the “curtain”, move it, set it in motion, after first removing the deflectors from the central part of the dashboard with a flat-tip screwdriver. Be careful, as the plastic casing of the console is damaged.

Metal ones are better and more practical, but they are afraid of moisture, rust, and deposits. Plastic ones, on the contrary, are deformed from heat and elevated temperatures.

The second way to check the performance of the damper: if the windshield heats hot air, but the sides or legs are warm, there is a malfunction. There is no air flow - the microdetector has failed. This is the drive mechanism.

Defective damper micro-reducer

Diagnostics is permissible if you have a special device - an ohmmeter. It is designed to measure resistance in an electrical circuit. In old-style controllers, the indicators are in the range of 750 - 1250 Ohms, in new ones - 3400 - 5100 Ohms.

Troubleshooting occurs as follows: we start the power unit, set the temperature to o, wait 15 - 20 seconds, turn it off. We disconnect the controllers, measure the resistance with the ignition on between contacts X1.4 and X1.1.

At maximum temperature, the ohmmeter shows up to 5.0 Ohms on the new one or 1.6 Ohms on the old one. The absence of resistance indicates a malfunction: failure of the micro-gear sensor. More often, the tracks wear out, the wiring becomes damaged, and the fuse blows. To replace the micro-reducer, the stove is disassembled.

Fan runs at one speed

If the motor rotates only in the first two speed modes, then look for the reason in the resistor. It's faulty. Activation only at the third speed indicates “direct” operation, bypassing resistors. The reason is worn tracks on the switch, temperature controller.

Diagnosis of resistance resistor

The resistor design contains two spirals: the first with a resistance of 0.23 Ohms, the second with 0.82 Ohms. When both spirals are activated, the fan operates at the first speed; when one is activated, the motor operates at the second speed. When starting directly without a resistor, third gear is activated.

The most common causes of breakdowns of the VAZ 2112 stove are low levels of antifreeze, air in the system, malfunctions of the thermostat and pump.

Diagnostics, repair and replacement

You can check the gearmotor immediately after dismantling. You need to apply 12 volts to the contacts of the power connector. The easiest way is to take this voltage from the battery. We put two wires on the battery and connect them to the connector contacts. The gearmotor shaft should begin to rotate. When the polarity changes, the shaft movement must be reversed.

If this does not happen, disassemble the gear motor. If the servo drive operates, then the problem is in the control unit or wiring.

You can only disassemble the micromotor gearbox of a new type on your own. The plastic case is held on by clamps and can be easily separated into two halves with little effort.

After disassembly, we try to rotate the worm of the electric motor shaft with our fingers. If it rotates easily, then the mechanical part is working properly. Inspect the gear teeth. The recesses in the top cover for the gear shafts must be intact, without chips or ellipsoidal wear.

We try to apply voltage to the motor directly, past the chip. In some cases, a break is observed precisely in this area. If even after applying voltage directly nothing happens, the repair of the gear motor of the VAZ-2110 stove can be stopped at this point. The motor is faulty. It will be necessary to install a new motor or completely replace the gear motor, which is usually done due to the lack of suitable electric motors on sale.

Video: The stove on the VAZ 2110 does not heat up? Replacing the heater damper gearmotor

Replacing the gear motor of the VAZ 2110 stove of the new model, like the old one, is carried out in the reverse order of dismantling.

The only recommendation at the installation stage is to check the functionality of the new part. There are cases where even new spare parts had defects. And if you purchased a used servo drive, checking is required.

The test scheme is the same as at the diagnostic stage: we simply apply voltage to the windings of the gearmotor and change the polarity. The motor spins, the rod turns - we install the gear motor in its place.

Purpose and design of the gearmotor

The VAZ 2110 heater gear motor (or servo drive) is used for automated control of the interior heater damper. The heater damper regulates the temperature of the air supplied to the vehicle interior. This innovation from AvtoVAZ replaced the outdated cable system used to control the heater damper in classic models.

The VAZ-2110 gear motor is available in two versions: new and old. The old-style motor is metal, with a rod for connecting to the damper drive. The new type of gearmotor is plastic, with a shaft shank that connects directly to the damper mechanism.

The design of the gearmotor is simple. A motor, housed in a plastic or metal case, with a rated voltage of 12 volts, rotates a system of toothed plastic gears. The purpose of this system is to reduce the speed of the output shaft and increase the torque on it. The output shaft acts on the thrust or damper drive.

The heater drive is controlled by an electronic control unit, which is located on the dashboard under the heater control knobs. The motor is reversed by changing the polarity of the supplied voltage. Feedback to the control unit is provided by a position sensor.

The gear motor of the VAZ-2110 stove is located on the left side of the engine compartment under the upper plastic protection. Attached to the stove body with three screws.

Important practical points

Some difficulties may be associated with the installation of the micro-gear damper. For this work you need to hire an assistant. First you need to connect the contacts to the new motor. If the heater damper is turned against the clock, cold air is supplied. This means that you need to turn on the car’s ignition and switch the sensor on the heater control system so that it is located opposite the blue dot. Checking the micromotor gear can be carried out according to the opposite scheme, which involves turning the damper along the clock mechanism and installing the sensor near the red mark. The micromotor gearbox must turn more than it normally does. The square can be treated with a special lubricant, which will facilitate installation.

Replacing MR on ten

The owner of a VAZ car does not have to visit a car repair shop and pay for work that is not at all difficult to do with your own hands. For this you will need:

dismantle the frill;
remove the vacuum brake booster;
dismantle the pedal assembly;
remove the micro-gearbox. The device is dismantled along with the plastic element;
installation of a new device.

Most motorists note that replacing the gear motor of a VAZ 2110 stove is done quite quickly and does not require professional skills.

But when performing work, you need to adhere to the sequence of actions and accuracy. The installation of the device itself can be done by hand. If you need to install a damper, you cannot do without the assistance of an assistant. To do this you need:

connect the wires to the new gearbox;
turn on the cold air supply. To do this, the damper must be turned counterclockwise;
turn the ignition key, and then set the ACS sensor to the position pointing to the blue dot;
You can do the exact opposite. So, turn the damper clockwise until it stops, and point the sensor at the red dot;
for proper installation it is necessary to use a special lubricant, since the gearbox rotates more than required;
Next, you need to install the gearbox so that the mounting holes coincide;
at the next stage you cannot do without help. The partner must turn the temperature regulator and at the same time press on the gearbox;
sometimes the square does not extend the entire length of the damper, but approximately 75%. This is considered normal and does not affect the functionality of the system;
After this, you need to tighten the screws. Then you should scroll the gearbox from the blue dot to the red dot and back. Such operations are necessary for the device to remember the operating range. Now the air at the required temperature should enter the cabin.

If all the work is done correctly, the system will control the temperature automatically. In this case, the error should be no more than 2 degrees.

Photo report of the work completed

Now information for those who are used to looking at everything in pictures. This is what our heater damper control motor looks like:

After access to the gear motor of the VAZ 2110 stove is gained, it is necessary to disconnect the two plugs with the power wires. This is clearly shown in the photo below.

After this, you need to unscrew the three screws securing the heater damper motor, which are shown in the picture with arrows:

Unscrew everything using a short screwdriver:

And after that, take the gear motor out, pulling it gently to the side:

Installation proceeds in reverse order. As for the cost of this part, for the old-style VAZ 2110 the heater damper gearmotor can be purchased at a price of 1,500 rubles, but the new model is much cheaper - about 800 rubles.

Weak warm air supply

The air flow is warm enough, but the pressure is insufficient. In such a situation, the following malfunctions are possible:

The cabin filter is dirty. In this case, you need to clean it from dust with a vacuum cleaner. If this cannot be done, then it is better to replace it.
The stove radiator is clogged. In addition to dust, both insects and leaves create plugs. Small particles can be blown out using compressed air. To remove large dirt, you need to remove the grill and wash it.

Insufficient air pressure may be due to a leaking radiator

This problem is determined very simply - if you constantly add antifreeze or antifreeze, then pay attention to the condition of this unit in the car. To eliminate this malfunction, you will need to gain access to the radiator and remove it along with the heater

The practice of soldering the heatsink is unreliable. It is better to install a new part so as not to disassemble half of the front end later.

Assembly

When installing a new damper, be sure to make sure that the fork located on its axis is clearly engaged with the lever. If the flap is in the raised position, you did everything right. Otherwise, it will be impossible to control the device, so you can forget about restoring the functionality of the stove.

Damper location

After this, reverse the assembly procedure according to the dismantling steps. Refill the system with coolant and check that the new damper is in place. It is important to ensure that there are no leaks and that the hose connections are not tight.

Turn on the stove and check how the heater behaves. If everything is normal, you have carried out competent and successful work, for which we congratulate you.

Replacement

The preparatory process begins with removing the wiper arms.

It is necessary to unscrew the nut securing each lever, as shown below;

Installing a new element and assembling the heater is carried out in the reverse order. The replacement is complete, all that remains is to check the functionality of the damper after repair.

Detection and causes of malfunction

The main indicator of gearmotor failure is the inability to regulate the air temperature of the car heater. You can check the performance of the micromotor gearbox by supplying electricity from the battery to its motor in the middle position. In the same way, you can check the functionality of the controller, the failure of which also leads to the impossibility of temperature control.

The following defects may be the cause of gearmotor failure:

violation of the integrity of the electrical circuit, that is, the supplied voltage does not flow to the engine, the gearmotor cannot function correctly;
a defect in the autonomous heater control unit, as a result of which the reducer does not supply air at the required temperature.

The following material will help to identify the causes of malfunctions of the VAZ 2110 stove: https://vazweb.ru/desyatka/otoplenie/neispravnosti-pechki.html

Heater diagram VAZ 2110

Malfunctions and their causes, primary diagnosis

There are several malfunctions due to which the gear motor of the VAZ-2110 stove does not work or does not respond correctly to changes in the position of the handle.

If the ECU sends an incorrect signal or does not supply power to the servo at all, the damper will not work properly. This malfunction manifests itself in a complete failure of the damper drive (hot or cold air always blows from the deflectors) or its partial functionality (when some modes are turned on, nothing changes or the damper goes to its extreme position).
Lost contact. Oxidation or broken wiring will naturally damage the micromotor gearbox of the stove drive.
Switch electronics failure. A switch is the simplest set of contacts that alternately close when the handle is turned. Its malfunction manifests itself in the “loss” of one or more modes.
Motor burnout. Rare malfunction. It is observed in damp weather when the seal of the housing is broken or after a power surge in the on-board network.
Gearbox jamming. Plastic gears sometimes jam due to misalignment or foreign bodies getting between the teeth.
Drive failure. In old-style servos, the thrust breaks off; in new motors, the edges of the drive shaft are folded. This breakdown only involves replacing the micromotor gearbox of the VAZ-2110 stove.