Priora heater only works at speed 4

Why does the heater fan only work at speed 4? AvtoVAZ problems

Why does the heater fan only work at speed 4?

The reason for this phenomenon is the resistor through which the stove motor is turned on. Its malfunction can lead to such consequences. Let's first look at how this system works. The speed of the motor is adjusted by reducing the current. The maximum current value corresponds to speed 4. Slower operating speed is ensured by higher resistance, which reduces the current flow. The reason for the failure of low speeds is the inability to switch the resistance. This malfunction is fatal, so the entire part will have to be replaced.

Also, sometimes the fuse, which is located on the resistor body, fails. This problem is resolved by replacing it. For greater reliability, it is better to use a flag fuse.

Kalina's problem

. Before we start talking about replacing the resistor, we should mention one feature that is typical for the Lada Kalina, and is not essentially a malfunction. When you turn on the heater immediately after starting the engine, only speed 4 is available. To be able to turn on the others, set the stove to maximum, and after 5 seconds you can turn on any of the modes. Also on this model there is a weak resistor. You should not turn on the stove until the engine starts; when connecting the starter, there is a high risk of resistor failure.

Part selection

. If you need to change a resistor, then the first difficulty you will encounter is the selection of parts. There are 5 resistor options for the Lada, and you won’t be able to guess which one is worth it. You will have to first remove the part from the car. Installing another resistor may cause problems with the stove.

Technologically, the replacement process is not complicated, but a large number of small operations will have to be performed, which leads to a large loss of time. Replacement is carried out in the following order:

First we disconnect the battery; to do this, just remove the negative terminal;

The windshield frame trim is removed;

The vacuum booster may be in the way, so it's best to remove it. Although, this action is performed at the request of the driver;

Disconnect the block with wires from the resistor;

Remove the resistor. It is secured with a regular screw; unscrewing it will remove the part.

Lada Priora is a product of the domestic automobile industry. This car has earned people's love for its low cost, good quality, and the availability of parts when repairs are needed. Despite good reviews from owners, the car is not without a number of shortcomings. For example, it happens that the Priora stove only works at speed 4. You can go to a service station to find out why the Priora stove switch is not working. But you can wait for your turn for several days, and the problem needs to be solved as quickly as possible.

What to do first

In order not to get buried in the abundance of reasons, it is necessary to act from simple to complex. Leave the frightening thoughts of a broken cylinder head gasket and take a trifling attitude, as if the electric damper actuator has failed. Actually, that's where we'll start.

Check the operation of the climate control shutters

Turn the knob or rocker of the climate system and evaluate the temperature of the incoming air. For example, with “blue all the way” the air should be noticeably cold, and with the maximum red settings it should be warmer.

Immobilized valves will not be able to mix flows according to the specified °C value. Therefore, at any position of the regulator, air will blow at the same temperature. The dampers stop as a result of damaged fasteners or a failed servomotor.

Is the antifreeze level in the expansion tank stable?

Lift the hood, find the “extender” and the boundary marks on it. When cold, the antifreeze level should be between the MIN and MAX marks. If the tank is constantly emptying, look for leaks. You can look at where the coolant goes using the Lada Vesta as an example.

Heater radiators of some cars, for example Lada Kalina, are very sensitive to the amount of antifreeze in the expansion tank. At the slightest leak, the engine heats up, and the stove is cold or barely warm. And in general, when liquid flows out, air comes in and thus the system becomes airy.

Inspect the heater radiator for unobstructed circulation

Find two pipes going to the heater heat exchanger near the engine shield and touch them. The radiator assembly is embedded in a small circle in parallel, which means that the hoses should warm up immediately after starting the engine. It is better to carry out work when the engine is warmed up.

If one of the tubes is cold and the other is warm, the radiator is clogged or airy. First, rule out the presence of a dirt plug: pull off the outlet hose and evaluate the flow - practically nothing will flow out of a clogged radiator installation. Isn't that the point? Then feel free to expel the air.

How to remove an air lock without draining the coolant

It happens that if there is air in a small circuit, the temperature sensor on the dashboard behaves strangely: the needle sometimes jumps. For example, it was at 60°C and instantly became 90-100°C, then returned back. This is explained by the fact that the air heats up noticeably faster than the liquid and to higher temperatures. As a rule, the needle twitches when the system is seriously aired.

Main elements of the stove

Structurally, the Lada Priora stove is similar to the device installed in the VAZ 2110; let us highlight its characteristics in the mechanical and electrical parts.

Mechanical part:

Air outlet distribution group. It consists of heated shock absorbers for the lower part and windshield, semi-hulls on the left and right, and a shock absorber control lever.
Covering the dashboard with guides provided inside.
Ventilation ducts (located on the left and right). Oval windows and side deflectors are connected.
Heated side window deflectors.
Ventilation deflectors (central and side).
Air duct for heating the “legs” area of the driver and front passenger.
Air duct for heating the rear of the car, where the passengers are.
Spoiler.
Air filter.

Electrical part:

Geared motor for air distribution. It ensures the distribution of air flow across different zones in accordance with the established mode.
Thermometer. Fixed in the ceiling area for more precise temperature control.
Resistance (additional, additional). The rotation speed of the oven fan depends on this. Mounts in the engine compartment.
Heating device controller/control unit. Here the car owner sets the device parameters.
Electric fan. Located in the engine compartment.
Stove radiator (located inside the heating device).
Heating valve motor. Redirects air flow into the cabin.

No heating at idle

It is not for nothing that this issue has been submitted for separate consideration, since it worries many motorists and solving the problem can be much more difficult than one might expect. So, you have a Priora, the heater does not heat up at idle, although when the car is moving, the interior is heated in normal mode. Here you can also identify several possible reasons:

Insufficient coolant level.
Leaks that lead to a decrease in antifreeze levels.
There is an air lock in the system.

If the first two problems can be easily diagnosed and eliminated, then with an air lock the situation is much more complicated. If you have ruled out the first two reasons and the Priora’s stove still does not heat up at idle, you need to eliminate the air lock. You must proceed as follows:

We remove the screen from the engine.
We lower the clamp, after which it is necessary to remove the heating tube for the throttle assembly. We choose any of the two.
Unscrew the cap on the expansion tank. We place a clean rag on the neck and begin to blow into the expansion tank. The air supply should be carried out until coolant begins to pour out of the tube, which was previously removed.
Immediately place the tube on the fitting and carefully tighten the clamp.
Installing the screen.

If the option of blowing out the tank does not suit you, then you can go another way. We warm up the engine so that the pressure in the heating system increases. After some time, we turn off the car and remove the hose from the heating of the throttle assembly. In this case, there is no need to remove the cap from the tank. As a result of high pressure, coolant will be forced through the tube. All that remains is to place the tube on the fitting and tighten the clamp.

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Now the Priora stove should not cause any difficulties; you know how to fix faults, as well as carry out diagnostics and identify the source of the problems. Let the heater in your car always turn on, work properly and provide comfort regardless of the weather outside.

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We carry out comprehensive diagnostics

Removing a faulty heater from a Lada Priora is not so easy. Even experienced motorists cannot cope with this task quickly. To avoid doing such a large amount of work in vain, it is better to first diagnose the heating system. You must proceed as follows:

We probe the channels through which the coolant flows to the heater. They should be warm when the stove is on. In addition, when pressing on the main rubber hoses, resistance should be felt. If resistance is not felt, the pump pump may be faulty. This mechanism is responsible for creating the pressure of fluid flows necessary for normal operation of the heater.
A little secret that may be useful to Lada Priora owners: does the stove blow cold air for a long time and does not warm up as quickly as we would like? Then you can try filling coolant to the bottom mark in the tank. In this case, the liquid will warm up faster. If you practice this method, you will need to constantly check the coolant level.
If a running heater is a source of noise, then we can talk about a problem in the bearing, which is located on the electric fan. This situation cannot be ignored, since in the future the fan may jam and repairs will take place on a much larger scale.
Is the stove not working? Perhaps the problem is hidden in fuse F9 with a rating of 25 A. Its function is to protect the power electrical lines of the heater. A blown fuse must be replaced. If such a situation occurs with enviable consistency, then it is necessary to check all electrical circuits of the heater, the insulation of the windings on the fan and the presence of an overload in the power circuit.

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The dampers don't work

There are situations when shock absorbers do not work and their position does not change on command. In this situation, monitor the condition of the gear motor. Maybe it's out of order.

Oxidation of contacts may cause failure of this element. To solve the problem, remove the casing and clean the contact connections.

Carrying out diagnostics and repairs: where to start

Check fluid circulation. It may be insufficient if the pump breaks down or the cooling system is clogged. The thermostat is checked with the engine warmed up to 75 degrees. If the radiator pipe is cold when the engine is hot, then the liquid circulates in a small circle. Replacing the thermostat can help with this breakdown. If the heater works, but blows cold, then the problem may be the formation of an air lock in the engine cooling system.

If the fan works, but pumps air very poorly or weakly, then start diagnosing by checking the cabin filter. It may be contaminated, resulting in insufficient air in the system. Failure is usually preceded by the appearance of an unpleasant smell of dust.

If there is no air flow, you must:

Check the 25 A fuse.
If the fuse is intact, then check the fan itself. It may have malfunctioned. This element cannot be repaired, only changed entirely. It also changes when a whistle or buzz appears.
Sometimes there may be no air flow at only one of the speeds, for example, the first three or fourth. In this case, replace the resistor, it is the one that supplies the resistance incorrectly and stops the fan from working.
Check the heater control unit. If all other parts are working, then the problem may be in it or in the temperature sensor located in the cabin.

Another common problem is when the fan blows cold air instead of warm air. The radiator or damper is to blame for this failure. If the latter opens completely, then look for a problem in the radiator.

If you decide to replace or install an air conditioner, then it is best to purchase it from the Panasonic brand. Unlike another popular brand, Halla, it is quieter. In terms of service life, the air conditioners of these companies are approximately the same, although many car enthusiasts consider Panasonic less reliable. They differ in appearance

If you want to install the same model that was on your car, pay attention to the upper heating line. At Panasonic it is a flexible hose

Fan doesn't work

If upon inspection it turns out that air does not enter the cabin at all, proceed as follows:

Check the serviceability of fuse F9. It may have burned out, causing no voltage to be supplied to the device.
Make sure the fan is working properly. In this case, try to repair or replace it immediately.
Change the resistance if it is causing the fan to malfunction.
Make sure the controller is working.
Clean the fan. There are situations when the device becomes clogged, resulting in it not working or making more noise when rotating.
Burnt out fan relay. If none of the tips discussed above help, check the relay, the appearance of which can be assessed based on maintenance. If something is burned inside, this indicates the need for replacement. After this, the Priora stove fan should start working.
We wrote above about the cabin filter.

If the remaining units of the Priora stove are working normally, the cause may be a malfunction of the temperature sensor.

The Lada Priora stove does not heat well with or without air conditioning

Nowadays, a Lada Priora equipped with an air conditioning system will not surprise anyone. Air conditioning is an additional installation that increases the cost of the car. It may be included in the package, or it can also be purchased after purchasing the car. This car only recently became equipped with air conditioning.

When buying a car, it’s worth considering whether air conditioning is needed in the kit. Suppliers of air conditioners for this car are Panasonic made in Taiwan or Korean Hello. These two types of air conditioners with their parts were developed by contractors and look basically the same in appearance. When replacing a filter or belt in an air conditioner, you need to know its model and filter size.

If you bought a Lada Priora car without air conditioning, then in any case the question of purchasing it will arise later. You can buy an air conditioner from a domestic manufacturer. It is better to install the air conditioner at a service station or a specialized company.

The Lada Priora is in many ways similar to its progenitor, the VAZ of the tenth family, including the design of the heater. The manufacturer decided to leave the operating principle of the stove, replacing only some elements with new ones. At the same time, Lada Priora also inherited familiar problems, for example, when the stove does not heat and blows cold air.

Blows constantly hot

Another situation that may arise when using the Priora stove is that it is impossible to regulate the temperature and only hot air comes out of the system. Rotating the knob has no effect.

If yes, do the following:

Measure the voltage at the control unit (see above).
Measure the voltage at the MMR (geared motor).
When switching to the maximum and minimum voltage, 30V of a certain polarity is displayed, then it drops to 0.
If the quiescent voltage is not 0, but about 5 V, then the fault concerns the control unit.
If the voltage is not normal and the damper does not change position, it is necessary to change the MMR.

How to replace a stove radiator yourself without an air conditioner

What will be needed for replacement? First of all, the following tools:

Screwdrivers, figured and flat.
Wrenches for 8 and 10. (preferably heads with a wrench.)
Thin pliers for removing clamps.

And, of course, some materials and devices:

Container for coolant from the system.
New radiator.
Foam rubber adhesive strips for the radiator of the Priora stove.
2 liters of coolant. (same brand as in the system.)
Rags.

Having prepared such an arsenal, you can begin this interesting operation of replacing the heat exchanger.

Process description

Place the car level. This is necessary to completely drain the coolant from the radiator of the Priora stove. Place a container for liquid under the bottom of the car. It must be installed in the area of the radiator drain hole of the cooling system. On the right side (along the direction of the car, or on the left, if you stand near the hood). Next you need:

Unscrew the screw cap and allow the liquid to drain. When the pressure weakens, open the cap of the expansion tank. Wait for the drain to drain and tighten the plug. Disconnect the negative battery terminal. You can begin dismantling the protection. It's called frill.
First, the windshield wipers are removed. Using a 13mm wrench, unscrew the fastening nuts and remove the brush holders. After this, remove the rubber seal.
Unscrew the fastening screws. There are 6 of them on top and 7 along the bottom edge.

Now remove both halves of the plastic frill. After unscrewing the fasteners, remove the fabric protection of the glass niche in which the stove is installed.

Now comes the most crucial moment. Most craftsmen, when replacing this part, immediately disconnect the pipes going to the radiator of the Priora stove. However, there is a risk of dousing the heater parts with coolant. There is a more interesting and safer option.

Removing the stove

Now that the frill and protection have been removed, access to the heater is completely open. First of all, you need to disconnect the electrical connectors:

Micromotor gearbox for damper drive. 2 connectors.
Electric fan. 1 connector.
Resistor. 1 connector.

Now unscrew the fastening of the heater body to the car body. One 10mm nut secures the eye on the stove body to the right wing. 8 secures the top to the stud at the top. And two nuts at the bottom.

Once the fasteners are removed, the fun begins. Using a flat screwdriver, remove the 3 screws securing the radiator to the body

You need to act carefully so as not to break off the side, thin pressure relief pipe. After that, remove the screws holding the 2 parts of the heater housing. Move the left part with the fan motor a little to the left, disconnecting them, and pull it out

Move the left part with the fan motor a little to the left, disconnecting them, and pull it out.

After this, you can begin to remove the second half with the radiator. Hold the pipes with your hand and begin to remove the body to the left. When it comes off, set it aside.

After releasing the clamps from the pipes, remove them from the radiator.

Installation (replacement) of a new radiator

There are two options here. You can simply replace it by putting the part in place of the old one, before installing the housing. But it is better to install the radiator in the removed half before attaching the pipes.

Having decorated the heat exchanger of the stove with foam, install it in the niche of the housing and secure it with screws. Place the half in place and secure all 3 pipes in place. Tighten the clamps.

Carefully reassemble the heater in reverse order. Add coolant to normal level. Start the engine and wait for the cooling fan to operate. Press the accelerator pedal and hold the speed at about 2,000 rpm for a couple of minutes. This is necessary to eliminate a possible air lock. Turn on the heater and check its operation in all modes. All! Well, the necessary work has been done.

Video on the topic of replacing the heater radiator on a Priora without air conditioning.

One of the reasons for poor heater performance is the heater radiator. During the operation of the car, it begins to leak and is no longer able to transfer the required amount of heat to the interior. Depending on the year of manufacture and configuration of the Lada Priora, the process of removing the stove (radiator) can vary greatly.

The stove does not turn on

In a situation where the Priora stove does not turn on, there can be two explanations: a blown fuse, a fan motor, a controller malfunction, or oxidation of the contacts in the connectors.

After checking the fuse, proceed as follows:

Open the hood and on the left side (looking at the windshield) remove the sealing rubber at the top left.
Remove the four screws to remove the cover.
Locate the fuser connector somewhere near the third holder.
Turn on the ignition.
Try tightening the connector and notice whether the heater works or not.

Damage to the connector is a real plague for Priores, so do not rush to immediately change the control unit or other elements until you check the fuse and the quality of the contact connections.

Operating principle of the stove

The heater is controlled by a controller, from which a signal is received to turn on the stove. The driver sets the temperature in the cabin. If the temperature sensor detects that the temperature has dropped below the set level, the controller sends a signal to change the opening width of the stove damper. In some cases, an electronic failure occurs; instead of hot air, cold air is supplied.

The controller also regulates the number of fan revolutions. It sends a signal to an additional resistor, which, in turn, adjusts the operation of the fan using the built-in resistance. The resistor may not be used at all - then the fan runs at maximum speed. Thus, it acts as a “brake” for this node. If the resistor breaks, the fan may not start at all.

The driver can control which direction the air flow will be directed. To do this, he needs to set the value on the dashboard. The control regulators bark a command to move the dampers.

Principle of operation

To understand the reasons why the stove in Priora does not work, you need to know the principle of its operation. The same system occurs here as in the “tens”.

The air flow from the heater is directed to the distributor, where it directs the air, taking into account the position of the dampers.

Car owners can choose one of three places:

Heated/blown windshield.
Ventilation.
Direct flow to the feet of people in the rear or front seats.

You can choose an intermediate position of the blinds, for example, to direct air into the windows and ventilate.

The position of the dampers changes independently as you move the knob on the main damper panel. When airflow/heating is turned on, airflow is directed through ducts to the desired areas.

Each of these channels is located separately, which eliminates the mixing of different air flows.

The air duct for heating the “forehead” has blades that distribute the air flow over the entire internal surface. There are special openings for heated windows, through which the driver looks into the side rear-view mirrors.

They are equipped with special structures that distribute the flow in the desired direction. You will not be able to make changes here.

In the distribution part of the system there is a small space in the shape of the letter "P". It is located between the edges of the flap, which is why air is constantly supplied to the glass regardless of position.

When selecting the ventilation mode, the air flow is directed into the ventilation duct combined with the main and side dampers. Air distribution on the sides occurs thanks to a special spoiler.

When choosing the foot heating option, the air flow is directed down the air duct, which is opened by a special shock absorber. The heated air then reaches the feet of the driver and passengers.

In the electrical part, the Priora stove operates according to the following algorithm:

The temperature sensor located in the cabin sends a signal to the control unit.
If there is a difference between the set temperature and the actual temperature, the controller sends a command to the gear motor.
The latter closes or opens the stove damper to supply the necessary air (cooled, heated).
After selecting the fan speed, the control unit sends a command to the resistance in the motor section. To set the maximum speed, no resistance is used at all.

In addition, the driver controls the Priora stove, choosing the desired amount and direction of the air flow.

Schematic diagram of the Lada Priora cooling system.

Other heating system faults

The Priora has a heating system installed. It seems to be a reputable Japanese company, but for some reason problems with its climate control system arise more often than others. What this is connected with is unclear. For example, in the hot summer, the fan always has to be turned on at maximum speed in order to have at least some cooling effect.

You understand that this mode does not contribute to long-term operation. Another common problem is a malfunction of the operating modes for switching airflow from feet to glass or face. This is usually due to a breakdown of the gear motor or stove control controller.

Another snag is that the stove only works at 4th speed. There are also several reasons for this. There may be a problem with the resistor or the heater control unit.

To summarize, we can say the following: if you are not a car repair specialist, then you are guaranteed a constant visit to the service station. Don’t forget that many replacement parts for a Priora are simply impossible to find; they only need to be ordered from dealers, and this is an additional wait.

Malfunctions of the interior temperature sensor

We mentioned the temperature sensor in the cabin above. It is placed in a lampshade on the ceiling. When the heater is turned on, the controller checks the readings of this device and decides whether to turn it on or off.

Thanks to the sensor, an optimal microclimate is maintained in the car.

To check its functionality, do the following:

Close all car windows and doors.
Set the temperature two degrees higher than the current setting.
Place a thermometer near the sensor.
Wait for the fan to turn off and compare the values (set and real).

If the controller does not respond to sensor readings, the sensor is faulty and requires replacement.

Clogged filter

Experienced Prior owners have developed an algorithm of actions to find out where the heating system is leaking.

First approach

Before all checks, you need to make sure that the fan is working - it would be unreasonable to go deeper if the main element does not spin. The next steps are as follows.

The engine heats up to the desired temperature;
The pipes leading to the heater are probed. Both are hot - okay, one is at ambient temperature - which means there is no filler circulation;
The hood opens, the tap is located and turns to another position. If it gets stuck, you will have to immediately soak it with WD-40.
The system is checked for leaks. The detected ones are eliminated: a constant lack of coolant is also the cause of cold airflow;
The tap is working, there is no leak - the plug is removed from the tank and the liquid level is checked. Often an air lock forms in the tank; in this case, the coolant is topped up to normal, and the gas pedal is pressed sharply several times. The fluid circulation will resume and squeeze the plug out of the reservoir;
To make the last step more effective, it is better to drive the front end onto the nearest hillock so that the car’s radiator is lower than the stove radiator.

Second approach

When (or if) both pipes are filled with hot liquid, we move on to the dampers.

Again you will have to climb under the hood, this time to observe the operation of the damper;
If it is warped or jammed, you can try to gently shake it with your hand from inside the cabin. To do this, remove the central deflector and unscrew the plastic guides to reach the stuck element. Access is only possible for a thin limb, so it is advisable to invite a female person to the procedure if she does not mind;
If there are serious problems with the damper (the fastenings have rusted, the plastic has warped due to temperature or it has cracked), alas, you will be faced with difficult work: you will have to disassemble half of the heating system.

Third approach

The microreducer is a complete headache. First, its status is checked:

The left handle is moved to the “min” position. After a 15-second wait, the engine starts;
The controller that monitors the self-propelled guns is disconnected;
The tester measures readings
on both contacts. The resistance should be 800-1200 Ohms for units 1303.3854; 1313.3854 and 1333.3854; for controller 1323.3854 the norm is 3600-5000;
The same operation is carried out in the “max” position. Now the data is in the range of 3200-3500 for the first group and 1200-1600 for 1323.3854;
If there is no resistance or its unchangeability, the track on the sensor has been erased. It is not sold separately, so you will have to change the entire MMR. It is clear that not all the reasons why the stove does not work and cold air blows on a Priora can be eliminated on your own.

However, by following the above recommendations, you will at least understand what is preventing you from driving comfortably. And also estimate upcoming expenses. For example, if you have to change the entire SAUO unit, you will have to pay about 1.5 thousand rubles for it. plus the work of an electrician.

Why does the heater fan only work at speed 4? AvtoVAZ problems

Download PDF

Many car enthusiasts will be curious to know why the heater fan only works at speed 4. Typically, owners of domestic cars of the “tenth” family, as well as people operating Kalinas and Prioras, face this problem. Such a breakdown always occurs unexpectedly and causes some inconvenience. If at a frost of -30° the malfunction does not cause any special problems, then at higher temperatures the driver has to choose whether to drive in the cold or in a steam room. This has a negative impact on comfort. Therefore, you need to know how to properly fix this problem. In practice, this is not too difficult. Although you will have to tinker with restoring the functionality of the stove.

The heater engine on the Priora either works or doesn't work

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I read the forum here!! Maybe the filter needs to be changed!! or something else!! In principle, I was going to figure it out this weekend with the help of a book!! Be sure to write!! It’s just that winter is coming, it’s going to be cold! It either works or it doesn’t!

funny link you sent!! on my own topic!! But how do you know which sample? car VAZ 21101 March 2006

Judging by the year 11 but to be on the safe side.

How many speed adjustments are there on the climate control? 0 A 1 2 3 - 10 heater 0 1 2 3 4 - 11 heater

For clarity, you can read what they write in the FAQ and follow all the links, many questions will disappear by themselves, but for now if you have an SAUO controller 1323.3854 https://www.ae.ru/enthusiast/ Then exactly 11

according to speeds 0-1-2-3-4 if 11 then what could this mean? I read the link, a lot of interesting things! but I didn’t find any symptoms like mine!!

about 15,500 passed. The stove was in use all this time! in the summer for the cold, but now for the warmth more often! but also when and how. At first it turned on after a while, but now it doesn’t work well! described the symptoms!! It feels like something is stopping her from working! It’s rumbling and it feels like the fan can’t spin up!!

If the stove starts to dim slowly, then most likely it is a micromotor gearbox. I was blowing hot and not blowing, you turn the handle of the self-propelled gun, it started working 20 times. I bought a new micromotor-reducer, changed it and everything worked right away, the old one was out for 3 years, the new one is already 4 months old, everything is humming, it blows the air you want. It’s not difficult to change, but you still have to remove the frill, have a short Phillips screwdriver to replace the micromotor, and at the same time the filter The interior can be changed with the frill removed.

If air does not blow from the nozzles at all, or the filter is clogged or the fan dies.

Thank you, I will definitely try to redo all this!! I just wish I could find something else somewhere!! I hope everything is written in the book!!

Source

Only speeds 1 and 4 work

Often such a malfunction occurs when the stove switch only sends commands in extreme positions. The cause of the rupture is often additional resistance, which reduces the rotation speed of the combustion device.

A resistor is a block in which the fourth speed is direct and without braking. The device is located in the heater housing on the left and is secured with a pair of screws.

In a situation where the first three positions do not work, and only the 4th one works, the cause may be a failure of the resistor (mentioned above) or a failure of the heating and ventilation system control unit. The last defect is more common.

Below are the elements responsible for the operation of the Lada Priora stove.

1 of 6 — +

1 2 3 4 5 6.

Auto-assistance

In order to find a malfunction in the operation of the interior heater of a Lada Priora car, you need to know its structure and the location of individual heater components. On a Priora, the heater radiator will always be hot when the engine is running, since it is directly connected to the engine cooling system. And so that air pockets do not form in it, the radiator tank, using a hose, is connected to the expansion tank of the cooling system. This means that for this reason there will no longer be a malfunction.

The air entering the cabin passes through the air filter. If the filter is heavily soiled, due to untimely replacement, the air flow will become very weak, which will lead to fogging of the windshields and poor visibility in the direction of travel. To replace it you will have to open the hood of the car. The filter is located in front of the cabin heater fan.

The fan, together with the filter and the air flow control flap, are located in the engine compartment. They are located on the right side, under the windshield trim. The heater radiator is located in the cabin, under the front panel. There is also a temperature sensor, it can be found on the ceiling of the cabin, under the ceiling cover, and a control unit for the heater operation, its place is on the console.

You need to start troubleshooting the Priora stove by checking the coolant level in the expansion tank. It should be between the minimum and maximum marks when the engine is cold. It would also be a good idea to check the operation of the thermostat. To do this, just touch the upper pipe going to the radiator of the cooling system on a warm engine. It should be hot.

In the cold season, the temperature in the cabin is set by the driver using the corresponding knob on the control unit by turning it to the desired position. Thus, it sends a command to the temperature sensor, which must, through the control unit, activate the mini-motor-gearbox that controls the air flow damper. If cold air blows from the nozzles or is not at the temperature set by the driver, then the culprit will be the air damper, since it is in the wrong position. But you need to look for a fault either in the ceiling temperature sensor or in the mini-motor-gearbox, by replacing them with known good ones.

Whether or not a fan is working can be determined by the noise it makes. If the fan does not operate in any of the 4 modes, check the integrity of the 25 amp fuse F9 located in the mounting block

If one mode fails, you should pay attention to the heater resistor. It can be found next to the fan itself

If the commutator brushes are worn out, the fan motor will also not work. A characteristic smell will notify you of a short circuit in the armature winding. In this case, the fan motor will have to be replaced with a new one.

In addition to the above-mentioned malfunctions, the reason why the stove does not work may be the lack of contacts in the blocks of the wire bundles involved in the power supply of these devices. Knowing the structure of the Priora stove, the driver can find some faults on his own. If you don’t have enough knowledge, you will have to contact electricians.

Repairing fan and radiator

Often the heater regulator on a Priora does not work due to the fact that a large amount of dust or other small dirt particles has entered the heat exchanger. Over time, contaminants get inside heating devices. This cannot but affect the performance of the entire system. Air masses do not warm up well. You may note that the oven only works in position 4. In case of contamination, you can simply replace the entire radiator. You need to remove the device from the power unit side. Do not forget to first drain the antifreeze from the cooling system, disconnect the windshield wipers and wires, dismantle the fan completely and remove the entire radiator by removing the pipes leading to it.

The stove does not work on the Lada Priora (reasons and repairs)

With the onset of cold weather, the first malfunctions of the Lada Priora heater begin to appear. Situations may be different; in one case there may be problems with the fan, in another with the dampers, etc. Today we will tell you how to properly repair a stove on a Priora with your own hands.

Engine cooling system problems?

As practice shows, most problems with the Priora stove occur due to the ESD (engine cooling system).

In this case, the procedure is as follows:

We check the coolant level in the expansion tank so that it is between the “MIN” and “MAX” marks. If coolant has to be added all the time, then the cooling system is leaking somewhere. You should carefully inspect all pipes for leaks, and also tighten the clamps. By the way, in order for warm air to flow into the cabin faster, many car enthusiasts in winter specially add coolant only to the “MIN” mark. After all, the less liquid there is in the system, the faster it will heat up.

We check the coolant circulation in the SOD, paying attention to the expansion tank. Video example:

Video example:

If there is no antifreeze circulation, or it is not sufficient, then the pump may be faulty (it should be replaced) or the cooling system may be clogged.

Checking the thermostat. We warm up the engine to 75 degrees and feel the upper radiator pipe (in diagram No. 13), if it is cold, then the coolant circulates only in a small circle, the thermostat should be replaced with a new one.

If the stove blows cold air, then the reason may be airing of the SOD.

Problems with the heater elements of Lada Priora?

The stove on a Priora does not heat up when the cooling system is working? Then you should first understand the principle of its operation:

The heater control unit (HCU) receives a signal from the interior temperature sensor (installed in the interior lamp) and compares it with the temperature set by the driver. If the difference is greater than a certain value (for example, more than 2 degrees), then the ACS unit sends a control signal to the heater damper motor (MMR), which controls the heater dampers (opens or closes the air supply from the heater radiator).

If the heater only blows cold or hot air, regardless of the regulator (knobs) on the heater unit, this means the heater dampers are not working and there may be several reasons for this. Start by checking the overhead interior temperature sensor.

After this, pay attention to the MMR; it happens that its resistor layer or gear teeth are erased. If the stove on a Priora does not blow or blows but very badly, then start by checking the cabin filter

If there is no flow at all, then check the heater fuse (F9 at 25A). If this is not the reason, then the heater fan may not be working and should be replaced. It is also changed when the stove whistles or hums.

If the stove on a Priora does not blow or blows very badly, then start by checking the cabin filter. If there is no flow at all, then check the heater fuse (F9 at 25A). If this is not the reason, then the heater fan may not be working and should be replaced. It is also changed when the stove whistles or hums.

Let us recall that in the previous article we provided reviews from owners about the liftback grant. This car is a worthy replacement for the slightly outdated Lada Granta.

Don’t forget about the heater resistor, which affects the speed of the heater fan (for example, the 4th speed of the heater does not work).

If the heater is blowing cold air instead of hot air and you have made sure that the damper opens completely, allowing air to flow through the radiator, then the problem is most likely in the heater core.

Another reason for the malfunction of the stove may be the Priora heater control unit itself, but do not rush to buy a replacement without making sure that the actions are correct (this applies not only to the ACS unit, but also to other elements of the stove).

The easiest way to find out why the stove is not working properly is to replace the part with a working one and check its functionality. It is not necessary to buy a new part; you can ask a friend for a known working part, or negotiate with the seller, leaving a deposit.

Note that if you decide to make your car more comfortable and warmer, you can install heated seats or make your own heated steering wheel on a Prior. We talked in detail about this tuning, so you shouldn’t have any problems.

Thus, we examined all the elements of the Lada Priora stove. Proceed in the order of the article, moving from simple to complex, and then you will certainly be able to repair the Priora heater yourself.

Temperature sensor and control unit

Switching may be difficult due to malfunctions in the temperature sensor located inside the car. You can find it in the lampshade on the ceiling of the cabin. The regulator changes the mode, transmitting data on the air temperature in the cabin to the gearbox. Depending on the temperature, the damper closes or opens. The serviceability of this element of the heating system affects the correct operation of the stove.

Heating a car depends on the operation of the entire heating control unit. It is in it that the distribution of air jets occurs, the strength of the direction of air flows to one or another part of the cabin is determined, and the temperature value is determined. It is better if the reason for the failure is the resistance of the Priora stove, since it is difficult to repair the unit. To make sure that the reason for the incorrect heating operation is in the unit, you need to remove your unit and replace it with one that is in working condition.

In cars with air conditioning, the speed controller often fails. In the event of a breakdown, the heating system does not work or turns on only in the maximum position. Such a breakdown occurs when the oven operates for a long time with the damper in the closed position. This is where overheating occurs.

Finding the cause of a malfunction of the stove in a Lada Priora car is not difficult if you understand the principles of operation of parts and components. The correct sequence of work will allow you to eliminate the breakdown in a short time.

Guys, what kind of nonsense is this: the stove doesn’t blow, only in the fourth position, has anyone encountered this?

Google to the rescue. Everything is written there in detail about this problem.

0 0 Answer rating: 0

Stove resistor. 100%. You approach the front of the car. You open the hood. You remove the left frill (if you look at the hood from the street). And right there somewhere near the middle there is such green crap. Stove resistor. You take it. You go to the auto store. You buy the same one.

0 0 Answer rating: 0

If the car has climate control, don’t forget to take 4000 rubles to the car. For a new radio.....if your hands are not from the ass then 150 rubles

0 0 Answer rating: 0

I had the same thing, I was driving at - 40 on the highway and the heater raced and was fine, sometimes it turned on, sometimes it didn’t, I was driving 140 at this speed, the heat from the heater blows out well, I drove 90 km, it froze of course but it’s fine, I immediately took this crap apart in the winter and replaced the resistor and everything works

0 0 Answer rating: 0

And then it stops blowing altogether. The same problem only happened in winter. Either the resistor or the heater fan is dying. My fan broke then

0 0 Answer rating: 0

Cooling system or motor?

Before you begin troubleshooting the heating of the furnace, it is necessary to eliminate the impact of breakdowns of the cooling system and engine. Only then can you begin to figure out why the stove mode switch on the Priora does not work. To do this, we check the antifreeze level and engine operation. First step: look into the expansion tank and determine the coolant level. Then turn on the engine and warm it up for a while. This will allow you to determine whether the thermostat is functioning correctly. Just touch the thick pipes leading to the radiator.

If you find that the top pipe is hot, this indicates that the device is functioning normally. A cold pipe is a sign that the thermostat is not working properly and you will need to replace it. This part is inexpensive, so replacement will be easy. A loose expansion tank cap is another reason why the engine remains cold. Because of this, the Priora stove switch may not work. Just replace this part.

The cooling system of Lada Priora is slightly different from the tenth model; it practically does not create an air lock. It can be caused by incomplete system insulation or antifreeze poured into an empty expansion tank. Solving the problem is not difficult. Remove the reservoir cap, stand on a hill with your front wheels and accelerate.

Is it all about the filter?

Often, replacing the filter can help solve the problem of weak air mass flows - when dirty, it becomes an obstacle to the passage of warm air. And then, even at high speed, the air flow can be too weak. You can also repair the heater rheostat (Priora with air conditioning) yourself. It is enough to replace the thermal fuse. This is precisely what a clogged filter affects. The thermal fuse overheats and fails; it only works at the maximum position.

If the Priora stove only works in position 4, then this may indicate that the rheostat has burned out. The same problem can lead to the heating system operating exclusively in the first position. Additional resistance causes the stove to work worse and slower. You will note that the Priora stove switch does not work.

Dirty cabin filter

A clogged cabin filter greatly affects the operation of the air conditioner in the summer, but can be the reason why the stove does not heat in the winter. It is good when the filter is located in an accessible place (for example, behind the passenger glove compartment) and is changed regularly. But sometimes it is hidden deep in the depths of the center console, and the car owner does not even know about its existence. As a result, instead of a filter, a “bed” of dust, leaves and insects is formed there.

Regularly replacing the cabin filter is important not only for the heater, but also for human health, because passengers breathe the air passing through it. Car manufacturers recommend changing the cabin filter every 10,000 km. And if you often drive on dusty dirt roads, then the replacement interval should be halved.

Location and purpose of the resistor

In order to successfully replace the Priora stove resistor, you need to know where this part is located. Experienced drivers who have encountered problems with their heating system more than once may smile when reading these lines. But for inexperienced car owners, this question is relevant.

You can find the rheostat under the frill if you have a car without air conditioning. In models with air conditioning, this mechanism has a slightly different appearance and is located in a different location. For example, in cars with Panasonic climate control equipment you can find the rheostat under the left wiper.

The functioning of the rheostat is to ensure the normal functioning of the heater speeds. It is characterized by electrical resistance, which determines the rate of conversion of electromagnetic energy into thermal energy. An additional resistor for the Priora heater, or an additional one, as well as a rheostat - this is all the same element, which we will simply call a resistor.