Replacing the gear motor of the VAZ 2112 stove 16 valves

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 This innovation from AvtoVAZ replaced the outdated cable system used to control the heater damper in classic models.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.

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.

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.

Dismantling

When the work to restore the functionality of the MMR is completed, install it in place. For this:

Insert the pin of the micromotor-reducer lever into the slot of the lever. It is located on the damper drive;
If the lever is not turned properly, apply 12V voltage to the motor connector pins using two wires. We are talking about yellow wires here. This way you can return the lever to the correct position;
Having installed the micromotor-reducer, check it for operability, plus watch how the damper drive of your heater moves, whether the heater control lever “plows” properly to regulate the temperature.

We will repair or replace the damper and heater drive, you will be able to return the heater to its previous functionality and independently determine what temperature regime will be set inside the cabin of your VAZ 2110.

How to check the gear motor of the VAZ-2110 stove?

The easiest way to diagnose is to listen to the operation of the drive. To do this, turn on the ignition and turn the temperature control knob to one of the extreme positions. Then, sharply, in one motion, turn on the other extreme position of the switch. Listen to the central deflector on the dashboard. The motor makes a characteristic buzzing noise.

You can also visually check the operation of the damper. It is visible in the central air duct if illuminated with a flashlight. Turn the switch and watch the flap.

However, these diagnostic methods answer only one question: whether the damper control mechanism works as a whole. The reason may lie not only in the micromotor gearbox. For more detailed diagnostics, you will need to dismantle 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.

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.

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.

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.

The main malfunction that completely paralyzes the operation of the heater in VAZ-2112 cars is the failure of the heater gear motor. The purpose of this element in the system is to control the heater damper, that is, the gearmotor (MR) is responsible for opening and closing it. The movement of the damper can be monitored using appropriate signals from the control module of the machine's stove. It is worth noting that in the VAZ-2112 the temperature in the cabin can be maintained automatically, that is, the air is either heated or cooled if necessary.

If the heater gearmotor fails, before purchasing and replacing it, you need to pay attention to one important point: there are two types of gearmotors (old model and new), which are fundamentally different in their design. In view of this, it is very important to know what type of element is installed on the car, so as not to waste your time and not make unnecessary purchases.

Causes of failure

If the gearmotor is out of order, 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.

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:

Heater diagram VAZ 2110

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.

Replacing the heater gear motor

To perform this procedure, you will need wrenches and a shaped screwdriver. Installing a new part is not very difficult, so a novice car enthusiast can easily handle it in a personal garage.

remove the windshield wipers, unscrew the locknut and release the frill;
Now we have free access to self-tapping screws;
At this stage, you need to remove the rubber seal from the electric motor compartment. To do this, you need to unscrew the nuts on both sides of the frill;
the damper pipeline must be disconnected so that it does not interfere;
Unscrew the screws holding the gearbox thermal radiators;
near the vacuum brake booster in the left niche of the gearbox compartment there is a motor that must be removed by unscrewing the screw securing it from below;
The damper is assembled in the reverse order immediately after installing the heater gearmotor.

Testing the functionality of the installed element is carried out by measuring the resistance on contacts X1.1 and X1.4 with the controller turned off and the left regulator set to the blue mark position. If there is no resistance or remains constant during the test, this indicates a faulty shaft position sensor. Unfortunately, it is not sold separately, so you will have to change the gear motor.

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.

VAZ-2110. Self-repair of the heater damper drive. Checking the heater control unit.

To begin with, remove the central nozzles, move the air flow direction handle to the left all the way (position - all into the cabin) and see how the damper behaves.

Turn on the ignition, change the position of the temperature regulator from “minimum” (blue dot) to “maximum” (red dot) and look at the damper

If during this check the damper does not move, then in most cases the jammed micromotor gearbox of the heater damper drive is to blame.

It also happens that the damper seat is destroyed if it (the damper) is plastic. Such a malfunction can be determined by ear - you can hear the gearbox operating, but the damper does not change position. And sometimes you can hear clicks of the square shaft turning in the seat.

If the damper does not move during such a check, then you can first try to help the gearbox. Turning on the ignition and moving the temperature knob from one extreme position to another, pull the damper with your hand. This must be done carefully and without unnecessary effort. If it works, then this can be regarded as a half-measure, because... If you have already found the reason why it jammed, it will jam again soon anyway. But if it “releases” and the damper starts working, it becomes clear that you need to look for the cause in the gearbox itself.

If a miracle does not happen and the damper still does not respond, then you should check the power supply to the gearbox and its control unit.

Checking the heater control system.

Heater control circuit

To check, connect the tester to terminals x1.2 (pink) and x1.8 (brown). Turn on the ignition (the automatic control system only works when the ignition is on). When you move the temperature knob to its extreme positions, a control voltage of 10V should appear for 10-15 seconds. Also, each time the temperature knob is moved to its extreme positions, the polarity of the control voltage should change. If there is no voltage at all, then the ACS controller is faulty. Attention! Do not under any circumstances short-circuit these contacts or apply voltage to them (for example, battery positive). This will kill the output of the operational amplifier of the automatic control system, designed for only 1A, and you will have to repair or replace the unit. It is worth noting that the old-style blocks (several types, all with automatic speed, with the letter “A”, the speed handle has four or five positions) are interchangeable with each other, but not interchangeable with the new-style block (without the letter “A”, five speed positions - “0-1-2-3-4”).

If the heater only works in extreme positions or you suspect that the gearbox is working and its shaft is turning in the damper seat, then you should 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. The limits depend on the type of automatic control system and the micro-gearbox model used with it:

for the new sample 5 KOhm (hot) - 1.2 KOhm (cold),

for the old one 800 Ohm (hot) - 3.2 KOhm (cold).

If there is no resistance at all or the gear shaft rotates but the resistance does not change, then the damper position sensor is faulty. It can be replaced assembled with a micro-gearbox or rearranged from a gearbox of the same type.

If it is determined that the ACS controller is working and supplies the micromotor-gearbox with control voltage, but the damper does not change its position, then the micromotor-gearbox itself will have to be removed and checked.

It is attached to the heater body with three self-tapping screws, and can be removed without dismantling the heater.

We remove the wipers, unscrew the screws indicated by the arrows, the two nuts on the sides, carefully remove the plastic hook from the hole in the body and remove the frill.

For the convenience of subsequent repairs, it makes sense to slightly improve the windshield washer fluid supply system. To do this, cut the liquid supply tube and insert a plastic connector into it. In this example, a piece of tube from a can of polyurethane foam is used.

After removing the frill, access to the micromotor-reducer opens.

It is installed to the left of the vacuum brake booster and therefore, in order to unscrew the 3 screws that secure it, you should use a very short one. or a very long screwdriver.

As soon as the gear motor is removed and its shaft comes out of the damper seat, the damper itself will fall to the “cold” position.

So, the micromotor gearbox has been removed.

Using a thin screwdriver, carefully release the housing hooks and halve the micromotor gear housing.

We remove the motor from the housing.

We insert the wires powered by the automatic control system into the motor connector and check whether it rotates at all.

If the motor does not spin, then it would be better to replace it with a new one. But we will try to revive him.

Mark the position of the motor cover relative to its body. This is done so as not to accidentally change the polarity during assembly.

Carefully bend the side pressed in two places and remove the cover from the motor. Let's disassemble the motor.

We check the condition of the commutator and motor brushes, as well as the condition of the bearing in the housing.

If the motor did not work, then we try to find and eliminate the reason. Or, we replace it with a new one.

If it worked, then lubricate the bearings with silicone grease.

We check the condition of the gears of the gearbox.

One of the reasons for gearbox failure when the motor is working is the shearing of the gear teeth of the gearbox.

Again, the correct option would be to replace either the gear or the entire gearbox. But we will try to restore this too.

Repair of micromotor gearbox.

For this we need regular tea soda and superglue.

We clean and degrease the treated area.

Sprinkle it with soda.

Then, apply a little superglue to the baking soda. Keep in mind that the mixture hardens instantly. The main thing is not to miss or pour glue past, for example into other teeth.

We take a needle file or a very thin file and cut out a new tooth on the gear. This is a rather delicate and painstaking matter.

We bring it to perfection so that the gears rotate freely, without jamming.

We lubricate all the shafts and gears of the gearbox with the same silicone grease. We assemble and test the motor, observing the marked marks.

We connect the connectors to the gearbox and check its operation.

If everything works properly, then we assemble everything in the reverse order.

Additional information about the Ten / VAZ 2110 can be read here.

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.

Device location

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.

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.

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. 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.

Functionality check

In order to check the gearbox, you need to set the position on the blue dot on the left handle and wait 10-15 seconds, start the engine. Disconnect the controller from connector X1 and test the resistance in contacts X1.4 and X1.1. The gearmotor must have a voltage of 800-1200 Ohm for controllers 1303.3854, 1313.3854, 1333.3854 and 3600-5000 Ohm for controller 1323.3854.

After this, test the micromotor gearbox in the position on the red dot. The gearbox must have a resistance of 3200-5000 Ohm for controllers 1303.3854, 1313.3854, 1333.3854 and 1200-1600 Ohm for controller 1323.3854.

If the micromotor-reducer has no resistance or it does not change, this may indicate a defect in the shaft position sensor. It is impossible to purchase it separately, so there will be a need to completely change the gearbox in such a situation.