What to do if the fan on the VAZ 21099 does not turn on

The operation of the cooling fan is very important, especially in summer when the temperature is high. In the hot season, the likelihood of engine overheating greatly increases, so the correct functioning of the cooling system by means of a cold air flow that is supplied to the radiator is very important. If the car's cooling system, and in particular the fan, fails, then the liquid in the system inevitably boils, which can lead to a complex breakdown.

When the cooling fan does not turn on at low vehicle speeds, the first thought of many car enthusiasts is that the problem is in the thermostat. As a rule, in this case, the fluid in the radiator stops circulating. But in reality there can be many more problems with the cooling system.

Most often, problems with a non-working fan occur in cars with high mileage, and due to the similarity of the design of the cooling system, they can be applied to any model of the Lada family.

First of all, you should pay attention to the breakdown of the thermostat. It is very easy to check its functionality. To do this, you need to touch the bottom of the radiator; if it is cold, but the water is boiling, then most likely the fan is fixed, and the problem lies in the thermostat. On the contrary, if the radiator is hot, the thermostat is corrected and the reason for the lack of cooling lies in the fan.

Fan activation principle

The fact is that on VAZ 2108 and 21083 engines the electric fan comes into action thanks to a sensor installed on the right side of the cooling radiator. The fan is switched on directly when its contacts are closed at a temperature of 99°C. On cars manufactured before 1998, the sensor controls the fan through a special relay 113.3747 located in the mounting block. And on the VAZ 2111 injection engine, the cooling fan operates only through a relay based on a signal from the control unit.

Checking the cooling system

What to do if the VAZ 21099 carburetor cooling fan does not work? As soon as the car owner notices the first signs of overheating, that is, the temperature sensor needle has approached the red zone, but the carburetor has not yet begun to emit smoke from under the hood of the VAZ 21099, you need to check the operation of the cooling system.

Open the VAZ radiator tap, as well as the car air damper, which controls the air flow.
Turn on the electric motor that regulates the operation of the radiator at maximum power.
Inside the VAZ car, turn on the emergency button, then press the clutch pedal with your foot and very carefully drive off the road, stopping the car on the side of the road.
Leave the VAZ 21099 carburetor engine running for several minutes at normal idle speed with the radiator on.
After turning off the engine, the coolant system heats up precisely in those places where it comes into close contact with hot parts, resulting in the formation of so-called vapor locks.

Keep in mind that an overheated engine will not be able to shut down immediately. But such work is quite harmful to the VAZ engine, so it needs to be completed regardless of the resistance of the car.

Checking all wire connections

Step-by-step instructions for checking the cooling system.

First you need to open the hood of the car and inspect the entire space under it. Find a source of steam. Check whether there is enough coolant in the tank, whether all rubber hoses, the radiator and, of course, the thermostat are intact. Perhaps it is these parts and systems that need to be replaced.
Look under the foot mats to see if there is any liquid there. There must be a good reason why the car engine is not cooling.
If fluid is not found, you need to see if the sensors that start the radiator motor are working. To do this, you need to remove two wires from the sensor mounts located inside the radiator and connect them. After this, turn the ignition key on the car. If, after connecting these wires, the cooling fan begins to spin, it means that the fluid level in the cooling system must be brought to the desired level.
The cooling fan itself must be running constantly. You need to check the sensors in the radiator. At the first opportunity, it is worth replacing these parts with new ones, as well as replacing the pipes.
If the cooling system fan does not work when the wires are shorted, the cause may be a blown fuse or a broken fan relay. Another possibility is a burnt-out cooling system motor. In this case, it is necessary to replace all faulty parts.
After replacing failed elements, a control check should be carried out. To do this, you need to short-circuit a pair of wires that are connected to the car cooling fan switch and turn the ignition key. If the fan motor can turn on, the problem has been resolved.
If the cooling fan does not turn on, you need to check it by supplying power to the electric motor from the battery.
The engine of a VAZ 21099 carburetor can overheat even if the thermostat, which regulates the passage of liquid in the cooling system past the radiator or through it, has failed. In order to understand whether this is so, you should check the temperature of the hoses connecting the engine and radiator. If the bottom hose is cold, the thermostat is faulty.

Troubleshooting on VAZ 2108 and VAZ 21083 engines

Thus, to eliminate a malfunction on a carburetor engine, you must first check the integrity of the fuses in the mounting block. Burnt fuses are easy to see with the naked eye. On cars produced before 1998, the electric fan relay should also be checked. If it is found that there is electrical contact between terminals “c” and “b” or no contact between “c” and “d”, the relay must be replaced.

Also, do not exclude the possibility of failure of the sensor installed in the car radiator, as well as the electric fan itself. In order to test their functionality, it is enough to remove the contacts from the sensor and close them together. If the cooling fan starts working, it’s all in the sensor, but no, the problem lies in the electric fan motor.

Finding the problem

On injection engines the situation is different: the fan is controlled by a relay, but activation depends on the engine control unit.

Often the problem may simply be the fan cooling relay. For injection VAZ 21099 it is located in the passenger compartment in the glove compartment. The cooling fan relay is located to the right of all the others.

In carburetor engines, you need to find the fuse box. It is located under the hood on the left in front of the windshield. You need to find fuse mounting block 17.3722. The cooling fan relay is located in the second row. It is third from the right in this row. If the required fuse has burned out, it will be visible to the naked eye.

For VAZ 21099 produced before 1998, the situation may be slightly different. The relay does not turn on when there is an electrical discharge between terminals “c” and “b” or when there is no contact at terminals “c” and “d”.

The cause may also be a failure of the coolant temperature sensor. On carburetor engines it is located to the right of the radiator. On injection engines, the coolant sensor is located in the cylinder head exhaust pipe.

Its functionality can be checked in this way:

Place it in some container filled with coolant.
Connect the sensor to the multimeter
Next, increase the coolant temperature to a certain temperature and check the resistance indicated on the multimeter.

At a coolant temperature of 100, the resistance that appears on the multimeter will be 177 Ohms.

at 80 – 332 Ohm;
at 60 – 667 Ohm;
at 40 – 1459 Ohm;
at 20 – 3520 Ohm;
at 0 – 9420 Ohm;
at -20 – 28680 Ohm;
at -40 – 100700 Ohm.

If the sensor turns out to be faulty, then replacing it is not very difficult. To do this you need:

Turn off the ignition.
Drain the coolant from the expansion tank.
Disconnect the wiring from the sensor.
Using a 30mm wrench, carefully unscrew the sensor so as not to damage the socket.

If the sensor and relay are working properly, inspect the wiring. It could have collapsed somewhere due to corrosion.

It may turn out that the problem lies with the fan itself. You can fix it yourself by replacing the fan motor or impeller.

Fan removal procedure:

Disconnect power from the battery.
Disconnect the wiring terminals. One of the pads is on the fan.
Unscrew the connecting bolts securing the fan casing with a wrench.
To unscrew the right nut located on top of the fan, you need a cap socket and an extension.
Next you need to remove the pressure plate. To do this you need to unscrew the two left nuts.
Remove the pressure plate yourself.
Next, remove the fan and shroud together.

After you have removed the fan, you are faced with a choice: install another one or repair the old one.

Checking the inclusion of the fan on the VAZ 2111 engine

In case the injection engine gets hot, you should first check the fuse protecting the electric fan circuit, then the auxiliary relay. The cooling fan relay can be found in the passenger compartment on the passenger side under the glove compartment. At the same time, make sure that the fan motor is activated in forced mode.

In addition, the electric fan on the VAZ 2111 engine is turned on according to data from a sensor located on the engine exhaust pipe. However, to determine the malfunction of this sensor, service computer diagnostics is required.

General characteristics of the model

Dream car in the 90s

The dimensions of the car have changed somewhat due to the lengthening of the wing and enlargement of the hood. In addition, a completely new, improved VAZ radiator grille and, of course, an updated dashboard appeared. The length of the VAZ 21099 compared to other cars in this group has increased by 20 cm.

The VAZ 21099, like other models of this family, has many advantages:

it is capable of developing a fairly high speed;

has excellent controllability when driving;

Stable on completely different types of roads.

In 2004, this model of car was no longer produced in Russia, but its production continues in Ukraine.

VAZ 21099 cars come in two types. The VAZ 21099 has a carburetor, just like the VAZ 21099 has an injector, the layout of the fuel supply system is almost identical.

In the VAZ 21099 injector, the supply of gasoline when you press the gas pedal is controlled by a computer. In a carburetor engine, such emissions are controlled by special damper plugs.

Quite often, the owners of this car are faced with one problem: the VAZ 21099 carburetor cooling fan does not work.

How does the heater work?

In the “ninety-nine”, the operating principle of the interior heating system is similar to similar models of the manufacturer and is as follows:

With the onset of cold weather, the coolant supply is opened using the heater tap. After it warms up to operating temperature (90–100 degrees), the liquid begins to flow into the radiator.
There is a special switch in the cabin that has three fan operating positions (speeds).
In order to turn on the heater, it is enough to select one of the operating positions of its fan and, using special dampers, adjust the direction of supply of warm air (to the windshield, directly into the car interior, to the feet of the driver and front passenger, etc.).

If the heater motor is faulty, the car's heating system works extremely inefficiently, since it takes too much time to properly warm up the interior, since warm air enters it too slowly (or does not enter at all).

Elements and performance check why the VAZ 2109 fan does not work:

threaded sensor in the radiator housing type 9030330 for 20A;
electric motor switch relay K9 type 113. 3747;
electromechanical fan with DC motor ME-272 (or Slovenian production) with a speed of 2550 rpm. fuse link (fuse) - 16A, workplace on the block - 8.

Checking operation: open the hood, start the engine at idle speed and bring the temperature up to the set point. Control by instrument in the cabin. When 98 degrees is reached, the fan operates with a characteristic hum, its operation is clearly visible under the hood, and the indicator arrow on the instrument in the cabin goes down. Usually it reduces the temperature to 0.5-1. 0 min. If the fan does not work when the temperature rises to 100 degrees, turn off the engine and look for the problem.

The cooling fan of the VAZ 21099 injector 8 valves does not turn on reasons

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1. Is the signal working? 2. Is the previous one intact? 3. Is the relay working?

the last 2 can be found in the beard between the driver and passenger, but in general the search rules.

The signal is working. Between the driver and passenger under the dashboard, under the heater knobs?

There seem to be 3 fuses. and they seem to be on the ignition and injection circuit. so they are intact. And there is some kind of relay there, is it responsible for the fan?

I looked and all 3 relays are the same. Visually, there is no way to distinguish what? That is, only by touch, that is, you can feel with the pads of your fingers what will click?

The thick blue-black one should go to the fan relay, if memory serves.

By the way, I even tried to bridge the contacts on the removed connector from the DTOZH. although, as far as I understand, this does not need to be done on the injector.

Indeed, the contacts in the fan relay and in the fuse were oxidized; it looks like the coolant got in when it leaked into the cabin from under the heater pipes in winter. The relay clicks when the ignition is turned on and when the connector is removed from the DTOZH. I cleaned them with VDeshkoy. Reinstalled it. The result is nevertheless the same, the fan does not spin when the connector is removed from the DTOZH and the ignition is on. I changed the relay, took it from the main beam and put it in place of the fan relay, unfortunately the same result.

The relay does not click when the connector is removed from the temperature sensor.

Source

Causes of fan malfunction

In a VAZ 2109 car, the cooling system fan may make extraneous sounds during operation. There can be many reasons for this behavior:

It is possible that the bolt that secures the fan to the engine has simply become loose. Because it doesn't hold up well, it wobbles while riding. Actually, this leads to the formation of incomprehensible sounds.
The radiator is not installed correctly. That is, he is not in his place. Perhaps it lies on the cross member of the suspension, which is also not very good.
The fan may have broken on one side, causing an imbalance.

Note: it is not necessary to change it completely. It is enough just to replace the damaged part.

There is dirt on the impeller. This seems like a complete trifle, but it leads to an imbalance. The result is an incomprehensible tapping sound.

VAZ 2109 turning on the cooling fan

The cushions are not clamped well, so they do not hold the motor well. The cushions may be compressed (this happens after long-term use). As a result, the motor vibrates.

Note: this problem can be corrected by replacing the pillows or inserting rubber gaskets.

If the fan makes a loud noise, it means it lacks lubrication (you need to urgently lubricate the engine with oil).
The bearing broke. This problem occurs because the impeller has been damaged for a long time, so there is an imbalance in the system.

Note: there is only one way to solve this problem - replace the bearing. However, before this, you need to correct the position of the impeller, since another bearing may soon be damaged due to it.

Checking and replacing the electric motor

If after replacing the sensor the fan still does not work, then it is necessary to check and replace its electric motor. But first you need to dismantle it:

Remove the negative terminal from the battery.
Disconnect the fan from the power circuit (one of the blocks is located on its casing).
Unscrew the mounting screws from the device casing: left and bottom.
Using a socket with an extension, remove the fasteners connecting the casing to the generator.
Remove the two nuts on the left to remove the fan pressure spring. Take it off.
Pull out the entire assembly, along with the housing. Along the way, you may need to disconnect its wires.

What to do if the cooling fan on a VAZ-2109 does not work

From the moment electric fans began to be used on VAZs with carburetors, car enthusiasts often began to experience their failure. Previous mechanical models were considered almost eternal. In most cases, when a VAZ-2109 fan with a carburetor is said to not work, the unit completely stops performing its functions. In this case, the engine temperature exceeds 100 degrees, and the car may fail. To avoid major repairs of the power unit, it is necessary to stop driving after the temperature needle deviates into the red zone. Then you need to find the reason why the fan is not working.

You should start checking with the liquid level in the cooling system (check the expansion tank), and then gradually eliminate faults in other parts of the system:

fuse;

temperature sensor;

electric fan motor;
impeller (it can be deformed, which leads to jamming).

While performing work, you will have to check the condition of the power circuit along the way. All conductors should be visually normal. It is best to eliminate the probable causes of failure one by one so that the system operates stably.

How to change the impeller or align it

If, after dismantling the fan, you notice that the impeller is damaged or uneven, you need to remove it:

There is a lock washer in the center of the impeller; pry it up with a flathead screwdriver and remove it. If there is an additional fastening in the form of a nut, unscrew it.
Remove the impeller and inspect it. If there is any deformation, it is best to install another impeller.

During this work, you can upgrade the fan by installing an impeller with 8 blades instead of the standard 4.

Source

Fan

If the problem lies in the injector or carburetor cooling fan, then you will have to remove it. It is quite possible to repair the unit by replacing the electric motor or impeller.

Diagram with casing, radiator, fan and impeller

To remove the valve, perform the following operations:

Disconnect the negative terminal from the battery;
Disconnect the wire terminals. One of them is mounted on the fan casing;
Take a wrench and unscrew a couple of connecting bolts. They fix the vent casing on the left tank;
Next, unscrew another lower nut holding the device casing;
Now you will need a socket extension to unscrew the right nut on top that secures the vent housing to the radiator;
All that remains is to unscrew the fan pressure plate. To do this, remove the pair of left nuts;
Remove the pressure plate by hand;
Now remove the fan along with the casing.

You have removed the unit. Now you have a choice - change the entire unit, or try to repair it by replacing the electric motor or impeller if they are damaged.

Replacing the electric motor

Disconnect the fan motor wire that is held in place by a clamp on the casing.
The electric motor is held on the casing by three nuts. They all need to be unscrewed.
Remove the electric motor from the fan housing.
Be sure to check the condition of the rubber bushings of the electric motor, which will remain on the casing. If cracks or signs of deformation are detected, they must be replaced.
Check the electric motor for functionality. If it fails, you can purchase a new one and insert it into the old casing.

Article on the topic: Replacing the VAZ 2110 fuel pump, its mesh, and filter. Signs of malfunction.

Electric motor

It is not uncommon that the performance of a radiator fan is impaired due to a deformed impeller. By replacing it, you can restore functionality to the device.

Replacing the impeller

To change the impeller, follow the instructions:

Pry up the lock washer using a flathead screwdriver. It is located directly in the center of the impeller;
Lift the washer and remove it;
In some cases, the impeller is secured to the fan motor with a nut. Therefore, if you have one, unscrew the mount;
Remove the impeller and assess its condition. If it is worn out or deformed, replace it with a new one;
Many people, instead of a standard 4-blade impeller, install a more advanced 8-blade impeller.

Changing the impeller

During reassembly, make sure that the motor pin fits into the longitudinal hole on the impeller, as shown in the figure below.

Direct the pin into the longitudinal hole

The cooling fan of the VAZ 21099 injector 8 valves does not turn on reasons

Messages: 1506 Registered: Jan 31, 2010, 00:00 From: Regional Traffic Police Experience: 2001 Car: Mercedes Benz E260 :
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Post by WalkmanKviber » Mar 10, 2013, 09:58

bayker, the system could have become airy, then it will be too late for the sensor to reach the point where it needs to turn on, that is, the car is already boiling, but it still hasn’t gotten around to turning on (look at the plug on the expansion tank) or maybe it’s just a bad contact somewhere or a break , because if already checked: sensor, relay, fuse. and the ventel itself, then there simply cannot be anything else here.

Added after 2 minutes 19 seconds:

Source

Coolant temperature sensor for VAZ 2109 and 21099 cars

To begin with, it is advisable to know where it is located. On models 2108, 21099 and VAZ 2109, the coolant temperature sensor is installed between the cylinder head and the thermostat, in the exhaust pipe.

Device and principle of operation

The engine temperature controller itself is a thermistor-resistor device characterized by a negative temperature coefficient. The resistance parameter itself can be measured only when the temperature decreases or increases.

Causes of fan malfunction

There are times when the radiator cooling fan runs continuously. This is also wrong. What to do in this case? What is the cause of the malfunction?

There may be a broken circuit in the temperature sensor. This will be indicated by a constantly lit sensor light. In this case, you simply need to replace the temperature sensor or the injection system unit. The relay may need to be replaced. Also, the contacts on the radiator thermal switch that triggers the relay may not open. To fix the problem, you will need to replace the thermal switch.

To find out the cause of the fan malfunction, you will need to remove it.

Disconnect the fan block and harness by disconnecting the wires.
Disconnect the motor wire by unscrewing the left nut. If necessary, use suitable keys.
Under the hood, unscrew the two screws that secure the fan.
Take out the casing.
Remove the two fan mounting bolts.
Remove five more bolts and the air intake grille.
Lift the fan support and pull it towards you.
Rotate the fan itself 90 degrees and remove it.

Fan motor connection diagram

If there is any breakdown in the car, regardless of whether the fan has stopped working or something else, you should contact a specialized workshop. Experienced technicians will always find the cause of the problem, select suitable parts, sensors and carry out repairs. Of course, many car owners want to repair their vehicles themselves; this gives them a lot of pleasure and requires minimal costs. But in this case there is a risk of making a mistake with the selection of parts and the correct diagnosis. A car enthusiast can spend a lot of effort and time, but in the end do not get the desired result. To prevent this from happening, it is better to contact a specialist.

Where is the fan relay located?

4 – electric fan relay; 5 – electric fuel pump relay; 6 – main relay (ignition relay).

Attention: the order of the relays and fuses can be arbitrary, we are guided by the color of the wires. Therefore, we find a relay from which comes a thin pink with a black stripe wire coming from the main relay (pin 85*) (not to be confused with the thin, red with a black stripe wire coming from the controller) and a thick power white with a black stripe wire (pin 87) (white and pink wires we need), this is the fan relay.