The VAZ 2107 injector heater does not work, diagnostics, replacing the button, fuse

The fan of the VAZ 2107 stove does not work.

Hello.
This time I will write about possible reasons for which the heater motor on the VAZ 2107 may not work. These reasons can also be attributed to other classic models such as the VAZ 2105, 2106, 2101, 2103, 2104. To check all variants of the malfunction you need Have at least a test lamp, or better yet, a multimeter.

If you find out that it is the heater motor that has broken down, then read the article “Replacing the heater motor in a VAZ 2107.”

To understand what can break and why the VAZ 2107 heater fan may not spin, you need to consider the electrical circuit for powering this motor.

Connection diagram for the VAZ 2107 heater fan.

The diagram below shows how the stove fan (4) . Power from the battery, through the mounting block (1) , goes to the ignition switch (5) and again goes to the mounting block (1) . In the mounting block (1) it passes through fuse F1 (10 amperes) and goes to the stove speed switch button (2) . Next, power from the button goes either through resistance (3) to the motor (4) , or directly to the stove motor (4) .

The VAZ stove fan will not work if any of its circuit components is faulty. You can determine the reason why the VAZ 2107 heater fan does not work:

1. There is a fault in the mounting block.
2. The contacts of the heater fan speed switch are burnt out.
3. The speed control resistance has burned out.
4. There is a malfunction in the heater motor itself.

Let's take a closer look at each of the faults.

There is a malfunction in the VAZ 2107 mounting block.

If the stove stops blowing air, then first of all look to see if fuse F1 in the mounting block is intact. Usually, if this fuse blows, then the heated rear window and reverse lights stop working along with the heater. This fuse must be rated 10 amps . No more and no less. If you install a fuse of less than the nominal value, it will constantly burn out, and if you install a fuse of a higher nominal value, it is possible to burn the mounting block. If you have a fuse of a higher rating (as in the photo below), then the likelihood increases that the mounting block has failed and the plus is not supplied to the speed shift button. How to find out, read the next paragraph.

The contacts of the heater fan speed switch are burnt out.

You checked the fuse and saw that it was intact. Let's dig further. Now we take and remove the gear shift button from the panel and disconnect the wires from it. Afterwards, we reliably one end of the indicator light to ground, and alternately insert the other end into the removed terminals of the wires disconnected from the button. must be on !

If the light does not light up, then power is not supplied to the speed switch and the mounting block is most likely faulty.

If the light comes on when testing one of the contacts, it means either the button or something else is faulty. How to find out? Very simple! To do this, we make a jumper from a regular wire, from the contact, during the test of which the indicator light came on, to one of the other two contacts. The stove motor will work if the button is faulty. If the motor does not work, then it is the motor that is faulty.

The stove only works at one speed VAZ 2107.

When the stove operates only at the highest speed, this means that the ballast resistance has burned out.

In this case, just change it. It is located under the dashboard approximately in the middle, closer to the driver's side.

There is a malfunction in the heater motor itself.

Before disassembling the panel and stirring up the interior, check whether the mass going from the heater motor to the body sits well. It often happens that this wire simply rots.

If you have a multimeter, you can ring it. To do this, take out the speed switch button and disconnect the contacts from it. Now, in the continuity mode, connect one probe of the multimeter to ground, and check the wires with the others one by one. If the motor and ballast resistance are working properly, the multimeter will beep when checking two of the three wires. If the ballast resistance is faulty, then the multimeter will beep when checking one of the three wires, and if the heater motor does not work or does not have contact with ground, then the multimeter will be silent.

If you want to learn how to replace the stove motor, read this article!

I hope you found this article useful. If you have any questions or comments, leave them in the comments.

The central part of the electrical equipment diagram of the VAZ-2106

The central piece of the circuit mainly consists of light on/off switches and switches for supplying current to the system. The main wiring elements are indicated by the following numbers:

• Kit with main fuse block (30);
• Light switches in the car's reversing headlights (31), operation of warning lamps when the hand brake is applied (32);
• Types of plug sockets for portable lamps (33);
• Equipment for operating the turn signal and hazard signal (34);
• Design of the electric motor of the stove (35) and the terminal for turning off the brake light (36);
• Current supply relay for heating the rear window (37);

Tip: depending on the modification and year of manufacture of the VAZ-2106, the type of relay and its position in the network may change. To repair this spare part, it is best to use the diagrams that come with the machine.

• Set of resistors for the VAZ 2106 heater electric motor (38);
• Wiring to the light bulb in the glove box (39);
• List of switches for exterior lights (40), heating the rear surface of the glass (41), as well as the ignition system (42);
• A set of switches from low to high beam (43), a windshield wiper (46) and a car turn indicator arrow (44);
• Special types of vehicle horn switches (45), universal windshield washer switches (47) and dashboard light and emergency signal controls.

VAZ 2107 radiator fan does not work

The cooling system is designed in such a way that the fan starts only after the engine has warmed up to the set temperature. A malfunctioning fan switch can lead to serious engine problems.

Do not confuse this sensor with the coolant temperature sensor (DTOZH), which displays the engine temperature on the instrument panel and is installed on the right side of the engine.

It is possible to notice its breakdown in time only perhaps only in the summer, and even then in the city or when driving slowly, since the oncoming air flow is quite enough for the normal operation of the cooling system. The cooling system fan on VAZ 2107 cars starts with a characteristic noise, so the moment it starts is clearly audible.

Where is the switching temperature located?

The fan switching sensor is located on injection models, on the aluminum outlet pipe of the cylinder head (article - 23.3828, used in VAZ-2107i-2112, 21213, 2123, ALFA ROMEO, DAEWOO, FIAT, LANCIA, OPEL), on carburetor models (TM 108 -02 92/87 C) it is installed on the engine cooling radiator.

For the “classic” fan, the operating temperature is 92 degrees and the shutdown temperature is 87 C 0, so installing a fan that is suitable in size, but with a different number, is not recommended.

On carburetor models the sensor is located on the radiator

Checking the electric fan and its circuits

In order to check the operation of the fan and power circuits on the injection “seven”, you need to disconnect the connector from the sensor, the ECU will give a command to turn on the fan. If this does not happen, then you need to check not the sensor itself, but the serviceability of fuse F7, the electric motor, the fan relay and the power circuits. Below is a diagram of how to turn on the VAZ 2107 injector cooling fan.

Circuit diagram for switching on the VAZ 2107 cooling fan (injector)

The principle of operation of such a device differs from TM 108 and is based on a change in resistance.

As the sensor heats up, it reduces the resistance; the ECU monitors this change and, when the specified parameter is reached (about 195 Ohms), turns on the fan relay.

Everything about the cooling radiator fan on the VAZ 2107

The design of the VAZ 2107 car provides a cooling system, which is based on such an important element as a fan. The main purpose of the VAZ 2107 radiator fan is to provide cooling of the radiator with coolant due to airflow. The element in question plays an important role on which the efficiency of a car engine depends. If the device malfunctions, the operation of the car cannot continue, since the result of such a breakdown is overheating and jamming of the engine.

Mechanical forced radiator cooling

Owners of some of the first sevens know how the mechanical cooling fan system works. The impeller of the device is driven by the rotating crankshaft rotor. The elements are connected using a belt drive, and the operation of the radiator cooling fan begins immediately after the engine starts.

This method of fan operation is called mechanical, and its main advantage is reliability. When the engine starts, the impeller of the device begins to rotate, thereby providing airflow to the radiator. Such a system is simple and therefore practically does not require repairs. The main disadvantage of this mechanism is that the rotation speed of the impeller directly depends on the engine speed. At idle, the impeller rotates at a lower speed than when moving at high speed.

If in the summer, when starting a VAZ 2107 with such an engine, the rotation of the fan does not negatively affect the warming up of the engine, then in winter it is the opposite. When starting the engine in winter, it is necessary to quickly warm up the engine, and the constant rotation of the fan complicates this task, even despite the cooling system, which consists of two fluid circulation circles - small and large.

The disadvantage of prolonged warm-up of the engine is eliminated by using a thermostat, which controls the circulation of coolant in a large and small circle. When the operating temperature is reached, when the engine warms up, the thermostat opens the valve and the liquid circulates in a large circle, that is, through the cooling radiator.

In winter, when the car is moving at high speed, the fan cools the liquid too quickly, so you will notice that on such sevens the temperature gauge needle often does not reach the operating value. This is why many car owners place cardboard or cloth on the radiator grille to prevent the flow of cold air.

Electric Radiator Cooling Fan

In the design of the VAZ 2107, more modern carburetor and injection versions, an impeller with built-in electric motors is installed, to which wires are connected together with a belt drive. The electric fan motor for cooling the radiator is activated by the activation of a sensor that measures the coolant temperature. As soon as the temperature in the system reaches the appropriate mark (over 90 degrees), the contact in the sensor closes and therefore the fan turns on.

Such a system cannot be called reliable, but in terms of efficiency, it is ahead of the mechanical system. Such a system cannot be called reliable, since during operation the electric motor, sensor may fail, the wiring may be damaged, or the fuse may blow. In terms of efficiency, such a system is a leader, since the fan is switched on only when the coolant temperature in the system reaches above the corresponding value. In this case, the fan does not work in vain, as is typical for “mechanical” sevens.

Checking the electric fan and its circuits

If the cooling fan does not work on a VAZ 2107 car of an injection or carburetor type, then you need to start troubleshooting from the sensor itself. The fan motor switch is very easy to check. To do this, you need to disconnect the terminal blocks from it (there are two of them) and short them to each other (with the ignition on). If after closing the contact the cooling device operates, then the fault is in the sensor itself. If the impeller does not rotate after this procedure, then the problem must be looked for elsewhere.

Lower left part of the VAZ-2106 wiring diagram

This part of the diagram shows the elements and spare parts responsible for the operation of the engine and electrical wiring system (starters, relays, etc.). When browsing from top to bottom, you can see the following elements:

1. Machine carburetor solenoid valve kit (21);
2. The design of the car generator (22) and the starter itself (23);
3. Battery terminals (24);
4. A set of various types of relays responsible for receiving a charge for the entire system from the batteries (25), turning on the headlights with low beam (26) and high beam (27), as well as a relay that controls the operation of the windshield wiper (28);
5. At the end, the connection to the additional fuse block (29) is indicated.

VAZ 2107 fan does not work

Over the years of their production, VAZ-2107 cars were equipped with both carburetor and, subsequently, injection engines. Therefore, the electrical circuits for supplying voltage to the electric motor of the engine cooling system fan differ from each other.

On VAZ-2107 injection engines, a two-contact fan sensor, which is located in the upper pipe, when the coolant temperature rises above that for which it is designed, it must send a signal to the ECU. The electronic control unit, having analyzed the signal, turns on the fan through a relay.

Therefore, the search for reasons for the fan not turning on begins by removing the connector from the sensor with the ignition on. If the fan itself is working properly, then it should work. By inserting a load in the form of a light bulb into the connector terminals, the fan should stop. Thus, you check the electrical circuit of the fan motor. In this case, it will be fine, but the fan sensor will have to be replaced. However, it should be noted that there are also substandard sensors on sale, which, when installed on the engine, will also not work.

If, after removing the connector from the sensor, the fan does not work, then its functionality must be checked by connecting it directly to the battery. There are only two options for the experiment. If the fan is working, then you will have to check the functionality of the fuse that protects this circuit, the fan relay and the ECU. And if the fan does not work, then you will have to check the condition of its brushes for wear.

On carburetor engines of the VAZ-2107 car, there will be no ECU in the electrical circuit for turning on the fan, and some “sevens” do not even have a fan turn-on relay. Therefore, it is much easier to find the reason why the fan does not turn on, and many drivers of VAZ-2107 cars can cope with this.

2 comments

Thank you, you helped. Accessible and understandable.

Eng. I remove the chip from the sensor - it doesn’t turn. The fan is working (connected directly), I replaced the mother folders, the fuse is intact (the signal works), I changed the P3 relay under the glove compartment - no changes. The relay clicks when the ignition is turned on. The only thing I didn’t look at was the power supply unit for the burnt track. Tell me what the problem is.

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