The fan of the VAZ 2112 16 valves does not turn on

Tips for motorists

The electric motor of the fan, the engine cooling system of the VAZ-2112 car, is switched on through a relay . And it is triggered by a command from the electronic control unit, which receives a signal from the fan activation sensor. It is located just above the thermostat. It should not be confused with the coolant temperature sensor, which works with the temperature gauge located on the instrument panel. It is located below the fan sensor.

If the temperature gauge needle creeps into the red zone of the scale, and the noise of the cooling system fan turning on is not heard, then you will have to look for the cause of this malfunction. To begin, press the horn button, thereby checking whether fuse F7 (20A), which protects the fan’s electrical circuit, is intact. There is a beep sound, which means the fuse is intact, and there is no point in opening the mounting block.

Next we check the fan relay . It is located on the right side of the front console, where the passenger's feet are located. We open the cover, the original relay is the first on the left edge. You can check it by replacing it with an equally good one. And if, by closing contacts No. 85 and No. 86, the fan starts working when the ignition is on, then it is working. The fan motor can also be checked in another way by connecting it directly to the battery.

The most common cause of cooling system fan failure is the fan switch sensor . It is checked by warming up the engine to a temperature of just over 100 degrees, and then turning off the engine, leaving the ignition on. Remove the terminal from the sensor. If the fan starts working, the sensor is faulty. Naturally, first check whether the fan itself is working. If all of the above devices are working properly, the reason the fan does not turn on will be the electronic control unit.

The driver of a VAZ-2112 car can independently check the entire electrical circuit for turning on the fan, with the exception of the ECU.

The fan in the cooling system of any car performs an important function. Being one of the important components, it ensures cooling of the radiator through which antifreeze passes. Typically it should turn on when the antifreeze temperature rises to 100-107 °C. However, there are cases when on VAZ-2110 cars with an injector the cooling fan does not turn on, which leads to undesirable consequences.

Usually the entire system of injection engines operates automatically, but what to do when one of its elements refuses to perform its functions? The fan no longer turns on or works without rest, the sensor gives incorrect information, and so on. You should immediately search for the cause of the malfunction and eliminate it immediately.

Checking at home

Sometimes the electric motor turns on too late, when the antifreeze temperature is already high. This may be caused by a malfunction of the valve in the radiator cap or abnormal parameters of the switch on sensor. You can check the device’s response temperature at home using a multimeter and thermometer.

After disconnecting the electrical connector, the sensor is unscrewed with a key. To avoid burns, remove the device only from a cold engine, after draining the antifreeze. When reinstalling, it is advisable to use a new sealing copper washer and not apply too much force when tightening.

The switching temperature is engraved on the end; it can be from 92 to 95 degrees. To check, you need to connect the multimeter in resistance measurement mode and immerse the threaded part in a container of water.

While heating the water and monitoring the readings of the multimeter, we use a thermometer to record the moment it turns on, and when it cools down, the temperature it turns off. Standardly, these are 92 and 87 degrees; with significant deviations, late operation is especially critical, the device requires replacement.

To improve cooling, it is possible to install a double fan from Niva. There are two modifications for placement: after the radiator or in front of it.

On the VAZ 2110, any of the options can be installed with minimal modifications to the fasteners on site. When electric motors are connected in parallel, the current consumption increases to 40 amperes, which requires replacement of the wiring.

Monitor the engine temperature. If you notice overheating too late, then in addition to boiling of the antifreeze and a forced stop, more serious consequences are possible: deformation of the cylinder head, jamming of the camshaft. If there are defects in the operation of the cooling system fan of the VAZ 2110, the faults can be diagnosed independently by checking the thermostat, electric motor, relay, and switch sensor.

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Important Functional Purpose

In order for the internal combustion engine to operate effectively, it is necessary to maintain a certain temperature regime. This task is provided by the cooling system, which sometimes malfunctions. In this case, engine overheating cannot be avoided, resulting in failure of the cylinder head gasket and CPG parts.

To understand why the cooling fan does not turn on on a VAZ-2110 with an injector, you need to know how it works. In good condition, the optimal temperature of the antifreeze in the engine is maintained, which prevents boiling. If you constantly ignore the breakdown of any element, then after an indefinite period of time a major repair will be required. And this already promises considerable costs, but this can be avoided!

In most cases, the cause of one or another engine malfunction is its overheating. The temperature in the cylinders after combustion of the air-fuel mixture reaches 2000 °C. This generates a colossal amount of heat, which, if not removed, has a detrimental effect on some important parts. After all, as is known, strong heating leads to significant deformation of objects.

Cooling system

Typically, the cooling system of any car consists of the following elements:

radiator;
BC cooling jacket;
thermostat;
connecting pipes and hoses;
centrifugal pump;
fan with electric motor.

And if some device malfunctions, then on a VAZ-2110 with an injector the cooling fan does not turn on.

Every element is necessary for the proper operation of the entire system, but the fan is still one of the important components. Its task is to cool the radiator and, accordingly, the liquid passing through it, when necessary. If it stops turning on, this affects the performance of the entire system.

How is the fan connected?

Depending on the type of engine, the operation of the fan is controlled by different means. If the engine has a carburetor, then the operation of the device is controlled by a TM-108 thermobimetallic sensor located on the radiator body (if you look in the direction of travel, it is on the left side). In many VAZ cars, the sensor responds to the maximum antifreeze temperature (107 °C). With this value, the sensor immediately sends a control signal to the fan relay, and it begins its operation. But what should you do if the cooling fan on a VAZ-2110 with an injector does not turn on?

On VAZ-2110 vehicles equipped with injection power units, the operation of the fan is controlled by a controller, but a sensor is also present. It is located near the thermostat. When the antifreeze reaches its maximum temperature, the sensor sends a signal to the computer, which turns on the fan via a pulse on its relay.

Consequences of engine overheating

People and cars are similar in some ways. The healthiest person, being under the hot sun and without a hat, risks receiving a noticeable blow that will knock him down. A machine, of course, is stronger than a person, but it also has its limits.

When the engine temperature exceeds the norm, a destructive process begins.

Before you understand why the cooling fan on a VAZ-2110 with an injector does not turn on, you need to know about the consequences of overheating. Moreover, its degree depends on the stage:

weak degree;
average degree;
strong degree.

Slight overheating of the engine (no more than 5-10 minutes) does not pose any threat, since any experienced driver will quickly react to the situation and turn off the engine. The worst that can happen is the pistons melt, but most modern cars won't have any problems due to mild overheating.

Average overheating (more than 20 minutes) already has a significant impact on the engine. An approximate list of troubles that may follow:

cylinder head curvature;
the appearance of cracks in the cylinder head;
burnout of cylinder head gaskets;
destruction of interring partitions;
passing oil through the seals.

However, this is not the worst thing that can happen.

Severe overheating is a real threat to the engine. And we are not talking about the fact that the cooling fan of the VAZ-2110 with an injector does not turn on, but about much more serious things. All engine parts are damaged, sometimes even an explosion is possible. But this happens infrequently, since the car itself protects itself: each part has its own rate of destruction, and for this reason the engine simply turns off.

The destructive wave begins its movement from the combustion chambers and gradually affects all engine parts:

The pistons begin to melt and burn out.
Melted pieces of aluminum pistons touch the cylinder walls, which makes the piston stroke very difficult, which leads to their further destruction.
If the engine continues to operate, then the oil begins to lose its lubricating properties.
Due to overheated oil, all rubbing parts begin to collapse.
The connecting rod and main bearings begin to melt.
Under the influence of the pistons, the crankshaft breaks into two parts.

Troubleshooting

Many problems can be avoided if all detected faults in the engine cooling system are corrected in a timely manner. It seems that monitoring overheating using a sensor is not difficult, but in reality, drivers do not always pay attention to it. And older cars do not have any kind of alarm when this problem occurs.

Therefore, you must always be aware of indirect signs of overheating. And the first of them is a non-working stove, which may indicate boiling of the coolant. In this case, due to antifreeze vapors, an air lock is created in the system, through which liquid does not enter the stove.

Also, an overheated engine will begin to detonate and make loud knocking noises when you press the accelerator pedal. The walls of the combustion chamber begin to expand, which leads to an increase in the gap. Further movement of the car will inevitably lead to a significant loss of power and an increase in metallic knocking.

If the cooling fan of a VAZ-2110 with an injector does not turn on, the reasons should be sought in the elements of the cooling system themselves, checking:

fuse;
relay;
fan motor;
expansion tank cap safety valve;
sensor.

If the reason is still not clear, you should pay attention to the integrity of the wiring, usually everything points to it. For this you will need a tester. Once the broken wire is found and replaced, the fan’s operation is restored. If difficulties arise during wiring diagnostics, you should contact a specialist.

Expansion tank

If the cooling fan of a VAZ-2110 with an injector does not turn on, repairing it can still wait, since the whole problem may be in the valve of the expansion tank cap. Water, which is part of antifreeze, is known to boil at 100 °C under normal atmospheric pressure. It is for this reason that a higher pressure level is maintained in the cooling system, and then the liquid begins to boil at 107 °C, which is exactly the value the sensor responds to.

If the valve is faulty, the pressure is equal to atmospheric pressure, and the liquid boils at 100 °C instead of 107 °C, which the sensor does not “see”, although the entire system is working. You can only check the condition of the cover visually, but it is unlikely that you will be able to accurately assess its condition in your garage. Therefore, if you suspect a malfunction, it is better to immediately replace the old cover with a new one.

Fuse, motor and relay

You should look for the cause of overheating, starting with checking the fuse and fan relay. The first of them is located in the mounting block of the engine compartment. There it is labeled F7 (20A). You need to take it out and visually assess its integrity or use a multimeter.

In most cases, the cooling fan of the VAZ-2110 (injector, 8 valves) does not turn on precisely because of the fuse, since the control signal does not pass through. It is worth taking it out and visually assessing its integrity or using a multimeter. If necessary, replace it immediately; otherwise, you should look for the cause elsewhere. And in the meantime, it’s worth checking the fan itself. To do this, disconnect the fan connector and connect the electric motor directly to the battery through the wires, not forgetting the polarity.

If the drive is in order, then you should head to the interior, since this is where the relay is located. Its more accurate location is another mounting block on the left side relative to the front passenger’s feet. Of the three relays, the one on the left is the one you need. To perform the test, you need to install another relay in place of the old one. After this, start the car and wait for it to heat up to maximum temperature, while simultaneously watching the fan. If there is no result, the search continues.

VAZ 2112 engine cooling fan does not turn on

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Connected directly - it works.
What could be covered? The temperature is creeping towards the red mark. before it turned on somewhere in the middle between 90 and 100 Which fuse is responsible for the fan? Where is the relay located?

The fuse is located where everything is still powered to the horn - check by pressing your horn, if it doesn’t work, then the fuse is blown. Also, if I were you, I would check the temperature sensor, maybe there’s something wrong with it (it’s next to the thermostat). I actually had the same crap - the fuse is normal, I installed a new temperature sensor, it works straight away, but when you drive, it works, then it doesn’t. In general, I suffered and suffered, then one fine day it stopped working altogether, and I was stuck in a traffic jam, so I had to change the fan, but I think your canoe is not in the fan itself, but either a fuse with a relay or a temperature sensor.

Sensor

The Internet today can bring significant help. On some forums you can find owners asking why the VAZ-2110 cooling fan with an injector does not turn on. The reasons and photos are discussed by several people, who mainly refer to the sensor.

To check it, start the engine and wait until the coolant warms up to operating temperature. After this, you need to disconnect the sensor connector, the controller will detect an open circuit and switch the fan operation to emergency mode. If it works, then the reason lies in the sensor. It is worth replacing it and checking it again to be sure.

Features of replacing the fan switch sensor

As practice shows, replacing the fan switch sensor takes a few minutes, so there is no need to contact a service station. Proceed in the following sequence:

Remove the negative voltage from the battery;
drain the coolant from the radiator;
discard the supply wire from the DVV;
remove the fan switch sensor and replace it with a new one;
return the supply wire and the battery negative to their place;
check the operation of the node.

Carrying out diagnostics and replacing the internal combustion engine with your own hands is not a problem even for a beginner. The main thing is to find a few minutes of free time and do a few simple manipulations.

Domestic “tens” are equipped to ensure proper operation of the motor, based on the readings of various controllers. One of these is considered to be a temperature sensor in the VAZ 2110. You can learn more about this device, its operating principle, as well as diagnostics and replacement from this article.

Constant fan operation

This phenomenon, although rare, does occur. The reasons for the constant operation of the fan in this case may be a relay that is in a closed state or a broken wire of the device. To eliminate the breakdown, it is enough to replace the faulty element.

As you can see, you can independently diagnose and determine why the cooling fan does not turn on on a VAZ-2110 with an injector. The malfunction can be easily identified by checking each element, but there may be difficulties. In this case, you should contact specialists or start all over again. The final choice is always up to the owner of the car.

Car : VAZ-2112. Asks : Kirillov Igor. The essence of the question : The cooling fan does not work, does not turn on at all, what should I do?

Hello! The fan on my VAZ-2112 stopped turning on. It so happened that the car simply boiled in a traffic jam, so I realized that the fan simply did not work. Tell me what could be the reason?

Symptoms of failure

But, like any other spare part of a car, the temperature sensor can fail. So, what malfunctions can occur if the sensor stops working:

The cooling fan will run continuously.
The cooling fan will not operate.

In the first case, the car will operate in emergency mode and a constantly turned on fan can cause the winding to burn out. In this case, the product will have to be changed completely. In the second case, the engine will begin to overheat and at a certain point will boil .

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Operating mode

On VAZ-2112 cars, the operating temperature of the engine is about 89 degrees, the thermostat begins to open at 85, and the fan, with standard settings, starts at 105 and turns off at 97. We talked in more detail about the cooling system diagram of the VAZ-2112 in this material: complete diagram of the cooling system of the VAZ-2112.

Causes of malfunction

If the radiator fan refuses to start, check the items in the following order:

Fuse

Fan fuse - yellow F7. (editing machine mounting block, 124 engine)

The relay is located under the number “4”.

The sensor should be checked and replaced if necessary.

You can try to repair the electric motor.

When all of the above methods did not bring the desired result, you need to look for the reason only in the wiring, “ringing” them one by one. Perhaps there was a break or break in the wire somewhere.