We often find out about the stove not working with the arrival of cold weather (this can be either mechanical or electronic breakdowns).
To deal with the main malfunctions, first you need to study the design of the “tenth generation” Lada heating system and the very principle of operation of the stove.
We have identified five main reasons why the stove does not work on a VAZ 2110:
- The temperature is not regulated or the stove operates at one speed;
- The dampers distributing air flows do not work;
- The cabin temperature sensor (mounted on the ceiling) fails;
- Malfunction of the ACS controller;
- Antifreeze leaking from the heater radiator.
As a result of simple diagnostics and checking of these components, we begin to repair the heater.
How to check the serviceability of the SAUO controller
To check the automatic control system, you will need a multimeter to measure the voltage on the pink and brown wires (turn on the ignition and turn the temperature knob). Depending on which controller is installed on the car, the voltage changes differently. On cars before 2001, a heater control controller 1303.3854 was installed; its voltage in the “min” position decreases after 13 ± 5 seconds, and is constantly supplied to o. Thus, when the output voltage of the ACS unit does not change, it is not working. On cars after 2003, block 1323.3854 and stove 2111-8101012 were installed.
When the controller malfunctions, the dampers may not work, but in order to diagnose other causes of the malfunction of the VAZ 2110-12 heater, you will have to disassemble the heater.
Leaks
It is not uncommon for the stove to heat poorly due to the fact that the fluid level drops. Be sure, before adding antifreeze, check all the pipes very carefully, especially to see if there are any leaks at the fastening points. But if the heater radiator is leaking, then it must be removed.
Repair is possible, but if replacement is necessary, when choosing a radiator, you should know that aluminum is lighter and cheaper, but copper heats up faster and better, but is heavier and more expensive.
After replacement, be sure to check for leaks from the radiator, as well as at all connections.
Checking the dampers of the VAZ 2110 heater system
The stove system has 2 dampers. The upper one regulates the intake of cold air, and the lower one regulates the intake of hot air from the heater radiator. And when the drive mechanism or the damper itself breaks down, the stove can heat weakly, not heat at all, or fry too much.
Breakdowns of the stove damper can be of different types; firstly, the damper often gets stuck or jams, and secondly, the damper drive (micromotor-reducer) fails. In some cases, the damper warps or jams due to rust, since there are two types of dampers: the old and the new type, the old ones are plastic with a foam rubber seal, and the new one is metal with a rubber seal. Therefore, if you cannot hear the damper moving, you can move it by hand by removing the deflector in the central panel.
The problem with metal ones is that they often jam from rust, and plastic ones warp from exposure to hot air. So if, for example, warm air blows into the front window of a VAZ 2110, and hot air blows from the sides and into the legs, then most likely the damper has not completely blocked the air intake from the street. And when the dampers do not move at all, then you need to check the microdetector - the damper drive mechanism.
Main Culprits
Let's try to find the culprit that may be causing the stove to not work.
temperature sensor
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
You should also check the resistance of the temperature sensor in the cabin itself. At 20 degrees the resistance should be 20 ohms, at 15 degrees - 25 ohms.
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.
Cold air coming from the damper
This may be due to a faulty thermostat or air temperature sensor. It is also possible that the antifreeze level in the cooling system is low.
How to check the heater damper micro-reducer?
To check the damper drive, you will need an ohmmeter for measurement. In old SAUO controllers, the resistance at the minimum position of the blue dot should be from 800 to 1200 Ohms, and in new controllers - 3.5-5 kOhms. To check, you will first need to set the degrees to minimum and wait 15 seconds. Disconnect the controller connector and, with the engine running, measure the resistance between contacts X1.4 and X1.1.
At maximum temperature (red dot of the left handle), the multimeter should show 3.2-5 kOhm if the controllers are old and 1.2-1.6 kOhm if there is a new controller (1323.3854). If there is no resistance or if it does not change, it reports that the micro-gearbox shaft position sensor is faulty (the tracks are erased) or the ACS itself has simply failed and no voltage is supplied to the micro-gearbox.
To replace the microdetector, check the fan or repair the heater radiator, you will have to disassemble the stove.
The reason for the malfunction of the stove fan (operation in one mode)
You can find out why the stove in the VAZ 21I0 works only in the third position or exclusively in the first and second without disassembling. If such a problem occurs, then find the position of the resistance resistor. In the first and second modes, the fan operates using a resistor, and in the third - directly. Hence the answer that the cause could be either a burnt resistor, or the tracks in the speed switch were erased, as well as on the temperature controller.
Checking the resistance resistor
The stove resistor has 2 spirals, the resistance of the 1st is 0.23 Ohms, and the 2nd is 0.82 Ohms. When both are activated, the heater electric motor operates at the first speed, but if the resistor operates at the first spiral, then the 2nd speed is activated. At the third, maximum fan speed, when the resistor is not used. When the electric motor is turned on without a resistor, the fan rotor rotates at the maximum 3rd speed.
In addition to the above malfunctions, the stove may also not work due to a low level of antifreeze, air in the cooling system, or a non-working thermostat or pump.
Problems with the VAZ 2112 stove and its repair
The design of the VAZ 2112 stove heater differs from the previous VAZ-2108, 2109 family. When the engine is running, the radiator temperature should correspond to the general temperature of the cooling system. This means that the damper is always open and the supply of antifreeze (antifreeze) does not stop. The control system is electrical; processes are controlled by electronic sensors and controllers.
The center console has two control levers and one regulator. The driver, as necessary, sets the air temperature in the cabin, activates the desired mode (speed) of the fan, and directs the air flow to heat the glass and legs. A special electric thermometer installed in the ceiling controls the temperature. As soon as the temperature drops, the controller transmits a signal to the micromotor reducer, the heater is activated, and a flow of warm air enters the cabin. A malfunction of one or more units causes a breakdown, the VAZ 2112 stove does not heat well, and prompt repairs are required.
The stove releases cold air
The first thing to do is to determine the cause of the breakdown. This will help you find ways to solve it. But there are quite a lot of them, so let's look at the most popular ones.
One common reason is that only cold air comes out of the unit. This is the first sign that the stove is not working properly. The reason lies in the fact that the interior temperature sensor has broken down - it is responsible for what conditions are in the cabin and whether they correspond to those set by the driver. If it fails, then its readings are incorrect. Thus, the stove receives information that it is hot in the cabin. It will therefore produce cold air to make conditions more comfortable.
It's easy to fix this problem. There are several steps you need to take. First, remove the lampshade by unscrewing it. Then install a new sensor and check it for serviceability.
In this case, care must be taken not to reverse the polarity. Otherwise, the device will not work properly.
Also, the reason that cold air comes out of the stove can be a breakdown of the gear motor.
To determine it, you must first check the temperature sensor for serviceability. If everything is in order with the latter, then clearly the problem lies in the gearmotor. It is worth noting that this part, like the previous one, cannot be repaired. The only way to solve the problem is to replace it with a new one. This process is a little more complicated. It consists in carrying out the following actions. First, the wipers are removed. Then you need to unscrew the bolts that are responsible for fastening the frill and remove it so that it does not interfere. Thus, access to the element that has failed will be obtained.
Then you need to remove the gearmotor itself. To do this, its fastening is unscrewed. A Phillips screwdriver will help with this. Next, you should carefully disconnect all the wires. This should be done as carefully as possible so as not to damage anything. This is the only way you can completely dismantle the broken part. Using the same principle, but in reverse, install a new element. At the same time, make sure that the cut of the part clearly fits into the damper.
Ventilation device malfunction
If the fan does not work, you will need:
- replace the fuse;
- check the contacts in the block;
- replace the ignition relay.
To understand that the ventilation device is not working, you will need to turn on the stove at 1-2-3 speeds. If there is no noise, repair work is carried out. If the fan turns on at speed 3, then replace the resistor. To test the position switch, use a 12 W light bulb and 2 wires soldered to it. The torpedo console is first dismantled. To gain access to the stove switch you will need:
A lit light indicates that the switch is working properly. Otherwise, connect the lamp to the positive position switch. If it does not light, then there is an open circuit or the fuse has blown out.
If the fuse is blown, you need to find the source of the short circuit. Then the fuse is replaced. If the heating device only warms up the air, then replace the ignition relay. This part is located under the dashboard in the center console.
The stove fan is replaced in the following cases:
- there is voltage to the switches, but the ventilation device does not turn on;
- poor contact of the device mass located under the stove fixing nut;
- Motor brushes are stuck.
