Why the cooling fan on the VAZ-2112 injector 16 valves does not work: does not turn on at all

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?

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.

Where is

Drivers who have never encountered a malfunction in forced engine cooling before may not know where the internal combustion engine is located. On a carburetor VAZ 2110, this element of the cooling system is located on the radiator. If the driver finds this part, then he can easily find the fan switch sensor, which is located on the side. A characteristic feature of the product is the electrical wires connected to it. On the injection VAZ 2110, this part can be found on the cylinder block.

The sensor located in this way allows you to respond promptly to changes in coolant temperature. In addition, access to this part is not difficult and you can immediately begin repair or diagnostic measures if there are doubts about its performance.

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.

Diagnostics of VDV

If, as a result of replacing the sensor, the functionality of the cooling system is not restored, then the new part may be defective.

To make sure that the DVV is working, you need to perform the following simple steps:

1. Remove the sensor from the car.
2. Place it in a metal container with water.
3. Place the tank on the gas stove.
4. Boil.
5. Remove the DVV from the container and measure the resistance between the contacts.

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.

Where is the fan switch on sensor on the 16 valve VAZ-2112

Many motorists remember that due to a faulty fan switch sensor, the car began to boil in the summer. On new generations of cars, this indicator was moved from the left side of the radiator to the head of the block for effective recognition of engine and coolant temperatures. But, all the same, many motorists do not know where this sensor is located on the 16-valve VAZ-2112 engine.

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.

Quick Repair Methods

If the thermostat has died for a long time on a long journey, then first try knocking on its body. Sometimes, after exposure, the valve opens, but expect it to jam again soon. The best option is to drain the fluid and try to break through the thermostat to turn on the big circle. And if suddenly there is a new one or a working one in the glove compartment, then install it.

It’s more difficult with a pump on the road; it will be easier to add water as needed. But this is only if the leak is not very large. Having reached the place where repairs can be carried out, it needs to be replaced. On sevens this is done quite quickly, you just need to drain the liquid, loosen the fan belt and remove the old pump. And on nines you will have to remove the casing that covers the timing block, loosen the belt, and only then use a 10mm wrench to unscrew the three bolts securing the pump.

But with a fan everything is simpler. If there is a breakdown in the sensor, then the easiest option is to short-circuit its contacts. In this case, the fan will work constantly, so after stopping the engine, be sure to turn it off, as the battery will run out. If the problem is in the wiring, then the best way to get out of this situation is to connect a fan to the battery. But if the electric motor winding burns out, then only a complete replacement will help.

• Description of the VAZ 2107 cooling system
• Typical failures in the cooling system in 2017

The engine cooling system is one of the important parts of the car. It not only cools the engine, but also heats the car interior in winter. And to carry out maintenance and repair, you simply need to know the composition of the system and the general principle of its operation.

The first copies of VAZ 2110 cars were practically a copy of the nines. The only difference is in the body, but the engine and gearbox are similar. But carburetors were replaced by an injection system, and a lot has changed in the car, including the cooling system. Constant modernization makes itself felt, the car becomes more reliable, but more difficult to maintain. Of course, increasing engine power entails a lot of modifications. Changes occur in the braking system, lubrication and cooling systems. But the operating principle remains virtually unchanged.

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.

Procedure. Step-by-step instruction

If after completing the next step the problem goes away, further checks are stopped.

1. Open the hood.
2. Wait for the engine to cool down.
3. Perform an initial visual inspection: integrity of the hoses, reliability of the clamps, absence of leaks or cracks.
4. Make sure that the expander cover elements are in good condition. Remove scale, rust, clear holes, wipe, assemble. The absence of noticeable damage to parts gives hope that the product will work.

The valve design is elementary. The cover contains a spring. Functionally, it is designed to regulate the pressure in the cooling circuit. A hot engine increases it, a cold engine decreases it.

Compressing at a value of 1.1 atmospheres, the spring relieves excess pressure and prevents the destruction of hoses and the tank. As the motor cools, it creates a vacuum effect. The tank will begin to flatten. The valve equalizes the pressure.

The lid screws tightly on the thread, eliminating distortions. There should be a gap between it and the body. An overtightened valve will not work. It is difficult to test the device's operation in road conditions. You can check by replacing it with a known good one.

Inspect the electrical wiring elements to ensure a reliable connection

Possible factors for damage to electrical circuits:

• vibration;
• oxidation;
• burning;
• breakage, fraying of electrical wires;
• insulation aging, short circuit.

Switch the tester to resistance measurement mode. Remove it with special tweezers and ring the fuse link F7 located in the mounting block.

Fuse box diagram

Attention! It is important to find out and eliminate the cause of burnout.

Replace the burnt-out element with a serviceable one with a rating of 20A. Inspect and clean the nest. Insert fuse.

It was not possible to find out the reason, the protection triggered again - look for a short circuit.

How does the engine cooling system work? Diagram

Disconnect the fan plug. Use a tester to measure the circuit of the electric motor windings. Zero resistance or a break indicate the need to replace the radiator blower electric drive.

Interturn short circuits that cause multiple replacements of fuse links cannot be measured with the device.

Sensor check

Start the car. Pull out the coolant temperature sensor connector. The fan starts working - the sensor needs to be replaced. Secure the disconnected wire. Drive to a nearby service station.

Relay test

There is a hatch on the floor at the front passenger's feet.

Below it is a built-in panel with three relays of the same type:

• fan installation;
• fuel pump;
• ignition (main thing).

By replacing each other, try to start the airflow. The VAZ 2110 fan does not work - go to the next step.

Where is the VAZ 2110 cooling fan relay located?

If you are wondering where the fan relay is located on a VAZ 2110, then this photo below will answer your question and you can easily find where the cooling fan relay is located on a VAZ 2110.

VAZ 2110 fan relay

Check the electric motor

Winding measurements did not reveal a malfunction. Apply voltage briefly from the battery using additional insulated conductors. The operation of the fan indicates a malfunction of the controller, which does not output a signal to the relay.

• The only correct solution is to turn on the airflow directly and urgently visit a service station.
• Prevention of breakdowns of the cooling system of the VAZ 2110 injector 16 valves.
• Periodically inspect the components of the cooling system.
• Monitor the cooling temperature on the device, listen to the operation of the fan.
• Maintain coolant level. Replace after 2 years or 30,000 km.
• Use the solution to remove rust and scale.
• Signs of a change in the properties of the coolant are a change in color, an increase in fluidity.
• Check the density with a hydrometer.
• Do not mix coolants.
• Every twelve months, rinse the expansion tank cap with water and check it on a stand with a pressure gauge.
• Avoid contact of aggressive liquids with electrical wiring and electric motor windings.

Improvements to the fan start control circuit for the VAZ 2110 injector

The smooth functioning of the engine worries factory designers, auto mechanics, and car enthusiasts. Folk craftsmen change the design of valves and electrical circuits.

Installation of three position toggle switch:

• continuously on: the VAZ 2110 cooling fan does not work;
• constantly switched off: warming up the engine when starting in the cold season, automatic control is faulty;
• automatic mode: controlled by the controller, the equipment is working properly, the algorithm is executed correctly.

When choosing an installation location, consider the following conditions:

• prevent accidental switching;
• not to be confused with other controls.

It is important to remember when modifying the design about the safety of the changes made.

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.

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.

Nivovsky injection radiator 21214-1300024-43 (placed in front of the radiator)

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.

Nivovsky suction radiator (placed after the radiator)

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.

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 .

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 - Check this fuse element for continuity in the fuse block. It is located there under the number F7 and has a rating of 20 amperes.

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.