The main problems due to which the stove does not work in the VAZ 2110

As soon as the first cold weather arrives, some drivers are faced with a non-working stove in their VAZ 2110. The reasons may be different, malfunctions in mechanics and electronics.

To find out the causes of the breakdown and fix the problem, first of all you should study the Lada heating system and the essence of the stove’s operation.

In the course of their work, the mechanics were able to identify a number of the most common causes of a non-working stove on a VAZ 2110:

• the heater operates in one temperature mode at a certain speed or the temperature is not regulated at all;
• the shutters responsible for air distribution and then do not work;
• breakdown of the damper temperature sensor (located on the ceiling of the car);
• breakdown of the SAUO controller;
• Antifreeze heater radiator leaking.

Once all of the above points have been diagnosed and the cause of the stove failure has been determined, you can proceed directly to the repair.

Checking the operation of the automatic control system

To diagnose this system, you need to have a multimeter so you can measure the current on the pink and brown wires.
The voltage can have different values, it depends on which controller is built into the car. For example, in older cars - before 2002 - heater control controllers 1303.3854 were installed, in this case the voltage at the minimum position changes in about 14 seconds, and at the maximum value it is supplied stably. Therefore, if the voltage of the ACS unit at the output has a constant value, it is faulty. On newer cars since 2003, the built-in unit is 1323.3854, and the stove is 2111-8101012.

When faults are found in the controller, the dampers may be faulty. To determine other reasons for the breakdown of the car's 2110-12 heater, you will most likely need to disassemble the heater.

We identify the cause of the breakdown

First, you need to figure out the reason why the stove fan is not working. There may be several of them.

1. A faulty fuse is the most common, simple and most common reason that the motor does not turn. On the one hand, replacing a fuse is not a big and difficult problem, which can be easily handled even by a beginner. But on the other hand, it will be necessary to find the reason why the fuse has become unusable. And to do this, you will need to examine the electrical circuit that ensures the normal operation of the heating system for the presence of a short circuit. Since we are talking about fuses, it would be useful to know that the operation of the stove on the VAZ-2110 depends on fuse F7 with a current strength of 30 amperes. Also, the operation of this fuse determines the illumination of the glove compartment, the functioning of the cigarette lighter, the electric motor from the headlight washer and the heated rear window. If a short circuit is not found in the electrical circuit of the heating system, then the cause will need to be looked for throughout the wiring.
2. Problems with the contacts that are located inside the mounting block are a common reason for the VAZ heater motor not working. To identify this problem, you can move the block with the attached harnesses while the car is running. If the VAZ-2110 heater fan starts working, then it is necessary to remove the block and clean the contacts.

A problem with the contacts inside the mounting block is a common reason for a non-working fan.

1. A flooded relay may also be one of the reasons why the heater fan does not work. Diagnosing this problem is very simple: the fan will turn on only after the car has warmed up well. In this case, you will need to replace the relay, which is hidden behind the dashboard.
2. The heater electric motor can only operate when the third speed is activated. This situation is explained by the nature of the current supply to the fan: at speeds 1 and 2 this process is implemented through a resistor, and at speed 3 - directly. Consequently, if the heating does not work at the first two speeds, then the reason lies precisely in the resistor, which must be replaced.
3. The malfunction of the switch can be identified as follows: after removing the center console, start the car, take a large 12-volt light bulb with soldered wires, connect the negative wire from it to the body and touch the second wire to contacts 1, 2 and 3 on the additional resistor. When the light comes on, it indicates that the switch is working properly. But if the light bulb does not light up, then you will need to connect the wire from the light bulb to the positive terminal on the switch. If there is no light on the light bulb, you can talk about an open circuit or a faulty fuse.

A broken fan motor could also be the cause.

1. A faulty fan motor is the final cause that can result in a fan not working. Here we can consider three main reasons, the elimination of which may require replacing the motor, cleaning the contacts and replacing the brushes.

Diagnostics of heater system shutters VAZ 21I0

The VAZ 2110 stove has two shutters.
Through one, cold air is absorbed, and through the other, hot air is supplied. If the wire mechanism malfunctions, you may encounter the following disadvantages:

• The stove doesn't heat well
• There is no hot air flow at all,
• high air supply temperature,
• temperature is not regulated.

Shutters can have various types of breakdowns:

• It happens that the damper gets stuck or malfunctions, and the micromotor gearbox can also fail.
• Also, the damper may stop functioning due to rust, because there are two types of dampers.

There are old and modern samples of shutters,

1. old ones - made of plastic and sealed with foam rubber,
2. and modern ones are made of metal with a rubber seal.

If you cannot hear the damper operating, then try moving it after removing the deflector.

The disadvantage of metal dampers is that breakdowns often occur due to rust, while plastic ones tend to deform due to the supply of hot air.

In the case where the shutters do not move at all, diagnose the microdetector.

Fan replacement

If the problem still lies in the fan itself, then it would be best to replace it with a new one. The stove fan can, of course, be repaired, but this may involve, for example, replacing the brushes. It simply doesn’t make sense to carry out more comprehensive repairs, since you can’t hope for long-term service for such a part. Replacing a VAZ-2110 stove fan requires selecting a new part. There are two options here: find an old-style part or buy a new spare part. The second option is more acceptable and accessible.

VAZ stove fan

The replacement process is not as complicated as it might seem. It is enough to be able to work with standard tools, have free time and have the desire to tinker with your own machine. To replace a faulty fan, you must follow the following work plan:

1. Open the hood and remove the battery negative terminal.
2. We remove the windshield wipers by prying and dismantling the rubber caps. Using a 10mm wrench, unscrew the nuts and remove the brushes.
3. Using a slotted screwdriver, pry up the decorative plugs, unscrew the screws on the frill and the nuts on the edges. Now we can remove the frill.
4. Under the rubber seal you can find screws that hold the shield from the engine compartment. We also unscrew them.
5. We dismantle the hose through which washer fluid is supplied to the injectors.

The process of replacing a fan is not as complicated as it seems

1. On the right side of the engine compartment, there are two nuts on the bottom side that fit a 10mm socket wrench. They are difficult to get to, but you don’t have to unscrew them all the way, because with a few turns the shield can be easily removed.
2. It is necessary to remove the clamps from the hose that connects to the vacuum booster of the brake system in advance.
3. There are four self-tapping screws on the cabin filter cover; after unscrewing them, you can easily remove it.
4. Already at this stage the outlines of the stove motor are visible. But you will also need to disconnect the block on the heating system motor and on the resistor.
5. After the work has been done, it becomes possible to dismantle the left side of the stove along with the motor.
6. A new part is installed in place of the damaged element, and assembly is carried out in the reverse order.

If you have never had to remove a heating system fan before, this process may take several hours. But in the future, any problem with the heating system can be fixed much faster. Even if something doesn’t work out for you during your work, you don’t need to stop trying to achieve a positive result. Over time, everything will definitely work out.

Checking the micro-reducer of the stove shutter

To check the shutter drive, have an ohmmeter with you.
In old-style automatic control system controllers, the resistance at the minimum value of blue current should be from 850 to 1250 Ohms, in modern ones - 3.4-5.6 kOhms. If you want to check, you need to set the air supply temperature mark to the minimum value and hold for about 20 seconds. Disconnect the controller connector and, with the motor running, measure the difference in resistance in contacts XI.4 and XI.1. At the maximum temperature value in old controllers, the multimeter shows a resistance of 3.1 to 5 kOhm, in new ones - 1.3-1.5 kOhm. If the resistance does not change the readings or is absent altogether, this will indicate a malfunction of the micro-reducer shaft location sensor, which is associated with erasing the tracks, or a malfunction of the automatic control system itself, as a result of which no current flows to the micro-reducer.

In order to replace the micro-reducer you need to disassemble the stove.

Fuse problems

There are several main reasons for the malfunction of the stove fan located on the opposite side of the radiator. One of them is the failure of the fuse. This part is easy to replace. To prevent the breakdown from happening again, it is necessary to find a problem in the power supply circuit of several vehicle systems. The element itself is located in the installation box of the engine compartment of the VAZ-2110. Before replacing it, you need to check it with a multimeter: connect the probes of the device to the fuse contacts and carry out the test in test mode. If the multitester shows “0”, you need to replace the element - it has failed.

The fuse, located in the VAZ-2110 in place of the F-7, has a current strength of 30 A. It is responsible for the operation of several components:

• heated rear windows and mirrors;
• stove fan;
• lighting of the glove box in the cabin;
• headlight washer;
• cigarette lighter

Device

For the VAZ 2110 model, it is envisaged to use a heater 2110-01 with a separate system, which includes an air heating unit and an air distribution system through air ducts. A distinctive feature of the “tens” stove is the presence of an evaporator.

Device diagram

In general, the design is quite stable and allows you to maintain a pleasant microclimate in the cabin. And it breaks, as per the law of the genre - at the most inopportune moment.

VAZ 2110 heater blows cold, why?

Many owners of “ten” complain that at some point the stove constantly blows cold air and no amount of turning the handles of the automatic heater control system can save the situation. There can be a lot of problems and malfunctions. For example, the ACS controller itself is faulty, the ceiling sensor or micro-geared motor is faulty and simply does not open or close the damper. Another reason is the air (air lock) in the heater radiator, which is simply not capable of heating the air passing through it. Below is a schematic representation of the VAZ 2110 heater device .