Priora stove only works at speed 4

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.

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.

Motor repair

Quite often the stove starts howling, the reason is a malfunction of the fan motor. The easiest way to fix it is to install a new part. But this is not always a good solution. For many foreign cars, this small engine is quite expensive. If the car is old, then you will have to look for the part at a disassembly site, which is not the best option. Engine repair is not difficult, and can save quite a lot of money for your budget.

To carry out repair work you will need to remove the part. This process can vary significantly between models, so check the manual for your machine. The engine repair itself is carried out in the following order:

First we remove the impeller. It needs to be slightly heated with a hairdryer and tapped with light blows of a hammer;
The rotor is riveted;
Usually, the cause of howling is the burning of the bushing to the shaft and/or lack of lubrication. Remove the bushing. It will have to be carefully knocked out. Apply grease to the shaft, also lubricate the bushing;
The bushing is carefully hammered into place, after which the engine is riveted back. The assembled motor is installed in the car.

All work takes a maximum of a couple of hours (depending on the characteristics of your car).
The cost of repairs is almost zero. You will only waste a small amount of lubricant. Conclusion

. Any malfunction of the interior heating in winter makes operating the car uncomfortable. Therefore, the question of why the stove fan only works at speed 4 with the onset of cold weather turns out to be a pressing one. In fact, fixing this problem is very simple; for this you do not need any special knowledge in electrical engineering.

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.

There is not only the problem that the Priora stove operates only at maximum, but also the complete absence of air jets from the heating system. The first step is to make sure that the radiator is working in principle. Place your hand and note whether any streams of air are blown out. Even cold air masses indicate that the system is operating. Otherwise, there is a possibility of fuse failure.

If the fuse stops, it means the furnace fan is broken. One possible reason for the fan not spinning could be small leaves or other small objects that have gotten into the fan. This will be confirmed by a hum. If necessary, you can remove the fan on the Lada Priora using the same procedure as on the tenth model. Replacing the fan will solve the problem.

A breakdown of the gearmotor on a Lada Priora can lead to the damper not operating, which will prevent hot air jets from entering the cabin. You can get to the gearmotor through the hood. If the problem is not with the damper, then most likely the stove is not working due to the contacts being oxidized. Simply clean them with sandpaper.

Replacement

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.

After removal, it is advisable to check the resistor, this will allow you to accurately determine the serviceability of the part. This will avoid replacing a faulty part. To check, measure the resistance at the contacts; the nominal resistance is usually indicated on the resistor body. If the measurement indicator differs from those indicated, then replacement of the part is necessary. To install the resistor, simply screw the screw into place. Please note that you should tighten the screw as tightly as possible, otherwise you will get poor contact and the resistor will not work correctly. There will be no problems with installing the block; it is installed in only one position.

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.

How to diagnose?

In almost most cases, the stove speed controller is to blame; it is designated as J7100 090 and looks like this:

To be sure of this, you need to check it. To do this, remove the frill and get to this detail:

Remove the connector and unscrew the fasteners. We remove this part and disassemble it. We see these two contacts:

We put on the connector and turn on the heater in the car at 1, 2 or 3 speeds. We bridge these contacts and if the stove works, then the problem is 100% in this regulator. It failed because the thermal fuse tripped.

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.

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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.

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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

How to solve a problem?

This is obvious - replace the speed controller or, as Prior owners also call it, RHF. But this element costs almost 2 thousand rubles. There are alternative ways:

Replace the thermal fuse by unsoldering it and soldering a new one
Make a jumper and solder these contacts directly

With the first method everything is clear. The only difficulty is to find this fuse, but the second one is a little confusing. The fact is that the fuse is there for a reason. This is a kind of protection, if you get rid of it you can risk the wiring, but this is not entirely true.

Even in emergency mode with a directly soldered regulator, the stove will not be left without protection. In the event of a breakdown, it will blow out the fuse in the block under the steering column. And it will be easier to change this than to constantly buy a thermal fuse that costs 300 rubles. Therefore, what is better is up to you.

What to do if the stove does not turn on in any speed mode

If the VAZ 2110 stove unit does not work, the problem lies in the operation of the electrical network, since its electric motor is quite reliable and rarely fails. Before work you need to prepare a set of tools:

Tweezers for removing fuses.
Screwdriver Set.
Chain tester.
Jumper with contacts.
12 V indicator lamp (control).
Wooden stand.

When working with wires, you may need pliers, wire cutters and other standard tools from an auto electrician's kit.

Checking the fuse

If a malfunction is detected in the VAZ 2110-12 heater and it does not turn on at any speed, the first thing to check is the fuse responsible for its operation. This fuse is located in the block located in the passenger compartment to the left of the steering column, has the number F18 and is rated at 25 A.

Having opened the block, remove it carefully using tweezers and check it with a device, since a visual inspection can only reveal obvious signs of burnout. To do this, a device is connected to both contacts of the fuse, and if the circuit is restored and the fuse is intact, it will give a signal. When using a multimeter, you need to remember to set the appropriate 25 A settings. If the problem is in the fuse, it must be replaced.

The control checks the voltage on the fuse installed in the block; for this, when the ignition is turned on, one contact closes to ground, the second to the fuse; if everything is normal, the light on the device will light up. The ignition must be turned on. If there is no voltage, you need to check the supply wiring.

Heater unit connector

To get to the connector, you need to remove the heater unit and disconnect it. After this, you need to use a tester to check whether voltage is supplied to the control unit through the contact block to which it was connected. The plus is supplied through the blue wire, but there may be another connector, so they need to be checked methodically. Contact with the heater is established via the red wire.

To check the engine, place a jumper in the contact where the positive was detected, and a second jumper in the contact with the red wire. If the engine does not start, the failure of the stove does not depend on the control unit. Otherwise, you need to disassemble the block or simply replace it with a new one.

Checking the electric motor

You can check the operation of the electric motor only from the engine compartment. It is located under the windshield and is covered with a plastic cover that needs to be pushed aside by hand. With the jumper left in the connector and the ignition on, you need to install a wooden pad (a hammer handle will do) and hit the engine several times. Sometimes it happens that the brushes get stuck in it and after several blows they fall into place, the electric motor starts working.

Reasons for stove failure

Experience shows that the causes of stove failure can be different, since the heating system has several complex components. Among the most common problems, experts identify:

work in only one temperature mode and no speed settings;
jamming of the heater dampers responsible for air distribution;
failure of the temperature sensor;
clogged air ducts;
problems with the controller of the automatic heater control system (AHCS);
depressurization of the system with leakage of antifreeze, especially if the stove blows cold air.

The most common problem is when the heater does not blow at any speed; as a result, there is no heating in the car at all, and the heater needs to be repaired.

The stove operates only in the fourth, most powerful mode

Hi all. The problem is this: the stove only works in the fourth, most powerful mode, the first three do not work at all. A friend said that the motor or the brushes in it need to be changed. Who has encountered this, tell me what to do? Should I replace them completely or can these brushes be replaced?

It looks like the “hedgehog” was blown away. (stove resistor in other words) Photo from the open air..

If possible, I advise you to check before purchasing, as it most likely cannot be returned.