The principle of operation of the radiator fan and the main fault. What if the cooling fan constantly works: reasons, ways to solve problems and recommendations often turn on the cooling system fan

There are many important nodes in the car and on how high-quality they work, the quality of the machine works depends on. One of these is the cooling system. Often on some models it happens that the cooling fan constantly works. This is not a very good sign. Insufficient engine cooling can lead to overheating of the motor - and this, in turn, can pour out the owner into a large amount for overhaul. But if you know the reasons for such work in the cooling system, you can quickly identify where the malfunction is hidden and eliminate it. In order to find a breakdown, you do not need special knowledge and skills. Even beginner can cope with this. There is not so many reasons why the cooling fan constantly works.

The principle of operation of the fan in the cooling system

One of the reasons why the fan can constantly work or often turn on, is laid in the principle of system operation. The fan is started by a special sensor command. It is placed on the bottom of the radiator. This sensor is responsible for the temperature indicators of the coolant temperature. If it is more than you need, then the radiator fan will start.

When its blades rotate, an additional air flow is created. It helps to reduce which then passes through the channels in the engine. The cooling fan is constantly working only on motors that for some reason overheat. To avoid serious problems, you must immediately respond to this problem.

Thermostat

The engine can overheat the thermostat. It often happens that the mechanism of this element encourages. The fan, in turn, necessarily reacts to it. The thermostat itself remains open only half.

As a result, the coolant cannot effectively remove heat from the engine, since its movement is slowed down. When the power unit overheats, and the coolant temperature grows, the sensor responds to this event and starts the fan. Often, the owners of Opel Astra cars are faced with such a problem - the cooling fan is constantly working. And the problem of the thermostat is solved.

How to check the thermostat of the cooling system

Test it is quite simple. To do this, you need to start the motor and warm it up to such temperatures when the valves of this mechanism work. You can find out the temperature threshold right on the device housing. Usually it is 72 or 80 degrees. Then it is necessary to check the temperature on the lower and upper nozzle. If both are about the same temperature, then the reason why the cooling fan constantly works, found. It is recommended to carefully inspect the thermostat valves after dismantling it. Repair this node is useless (easier and cheaper to buy new). By the way, if this item is dismantled, it can be checked without installing the car. For this, the thermostat is placed in water tank, which is then heated. By an ingraft, the valve must open. If this did not happen, the device failed.

Pomp cooling system

Sometimes the reason that the cooling fan is constantly working and does not turn off, is a water pump. The temperature in the radiator grows, because the speed of its movement is slowed down. When the liquid enters the cooling radiator, the antifreeze simply does not have time to cool to the desired temperatures and passes to the next circle. In this case, the fluid is further warmed up.

When the pump is somehow working, then the fan can inform. If the pump finally broke down, then the engine instantly boils - serious problems and expensive repair are usually beginning.

Pump faults

Often, the pump does not stop its work suddenly. At first, the pump serves various signals about breakdowns - for example, the engine cooling fan is constantly working or often turns on.

The main reason for the pump failure is the bearing - it encourages or collapses. The fact that the pump failed to understand the characteristic sounds from under the hood. They look like a certain or a knock. These sounds can be heard even at idle. Beginning motorists often do not pay attention to these noises. The pump knocks are taken for the distribution shaft fault. To remove the breakdown, you should replace the pump. Depending on the model, you can only install the front of the pump and replace the bearing.

Cocktle Channel Channels

Often the motor is reversed due to congestion in the cooling system. The situation becomes more complicated by the fact that it is quite difficult to diagnose this problem. Therefore, if the cooling fan constantly works or turns on more often than usual, it will not be flushing the channels of SOD. In most cases, these events are more than enough to work correctly. Also, experts are not recommended not to be limited to washing, but also additionally blow the radiator.

How to Clean Cooling System

When cleaning the cooling and radiator channels, antifreeze is also replaced. To make flushing, old toosol needs to merge. Then a sufficiently strong solution based on citric acid is poured inside the system. This is an effective folk remedy, but there are various liquids with additives.

After that, the engine is breed - so the car should work for 30 minutes. This is enough to clean all the channels thoroughly. You can then drown out the motor, merge the cleaning mixture, and finally pour fresh antifreeze. Often in this way it is possible to fully solve the problems in the cooling system, if the reasons are in contamination.

Radiator scored

Car owners with experience know that the radiator is installed in the front of the car. When driving, he is blown away by the wind and air from the street. Also on the radiator accounts for all dirt and road dust. The element accumulates the poplar fluff, bird feathers and much more. Over time, all this garbage is clogged inside the plates, thereby reducing the effectiveness of heat exchange. The counter does not cool the antifreeze. It is heated and the cooling fan is constantly working.

How to wash the radiator

To correct the situation and secure the motor from the root overheating, it is recommended to clean the element. On most modern cars, it is first necessary to dismantle the part, but you can often clean and without dismantling.

Experts recommend cleaning with ordinary water. Best if it is served through the hose. Sometimes it makes sense to clean the radiator cells with a brush and only then flushing. Often this procedure is combined with the blowing of the radiator with compressed air.

Air traffic jams in the cooling system

For experienced car owners, air traffic jams are not at all a secret. They arise because of some errors in the process of replacing the coolant. Also reasons serve leakage in the system. Antifreeze can not evenly warm up. This leads to instability in the fan work. It often turns on or working at all without a break - a hot cooling fluid falls into the radiator. Before trying to eliminate these most traffic jams, you need to check the system for leaks. If they are found, then they should be eliminated. Next you need to remove traffic jams. This requires a compressor. From the throttle, unscrewing one tube, which brings the liquid. Then the compressor is connected to the neck of the expansion tank and the air supply begins. Two-three minutes will be enough to go all the traffic jams.

Problems with temperature sensor

If the cooling fan is constantly running on the VAZ 2107, then often everything is the radiator temperature sensor both on carburetor and injector cars. In most cases, it is simply in a closed state.

If the symptoms are precisely those, then check the time to which the fan is turned on, and compare the temperature when it is turned on with the standard one. If lower indicators, the problem is easily solved by replacing the sensor.

Winter warming

Many motorists are trying during the winter - there is an opinion that the engine will warm up faster and get to save fuel. However, during thaws, the air temperature rises. If the insulation is installed, the engine will not be able to effectively cool. It may be the answer to the question of why it constantly works, but this is a rather rare cause.

Summarize

So, among the most popular reasons why the fan is unstable, it is possible to distinguish with electronics. It is on this that most car owners are complaining of profile forums. Many solve this fault by replacing the sensor and fuses. And it helps. At half past cases, the question can be solved by replacing the thermostat. Also, the situation can be improved by cleaning the radiator.

Problems happen on any cars, this topic worries owners of Ford Focus cars. The cooling fan is constantly working on the luxury car. It is important to notice this problem in time, otherwise it can lead to deposits. With a strong overheating, the engine can only help overhaul with the replacement of cylinders, cylinders, pistons and other components.

Sometimes car enthusiasts face that the cooling fan is constantly working on a VAZ 2114. The reasons for such a phenomenon can be quite different, and in order to eliminate the malfunction - it is necessary to clearly understand that it could lead to it. About the fact that the fan ceases to turn off and how to fix it - we will talk in today's article.

Device and principle of fan operation

Before moving to the repair of the fan, it should be understood with the principle of its installation on the cooling system. To do this, it is better to take advantage of the following simple scheme, on which the numbers are indicated by the following main parts:

1. - Cooling radiator.
2. - Cork.
3. - Fan electric motor.
4. - Protective casing.
5. - Fan impeller.
6. - damper pillows.
7. - Cork for draining coolant.

In addition, it will be very helpful in the repair and circuit of electrical equipment of the cooling system, which looks like this:

As you can see, the start of the cooling fan is monitored using a relay, the start of which occurs after the signal is received from the temperature sensor.

After the fluid in the radiator reaches a certain temperature, the thermal sensor closes and thus provokes the start of the fan.

After the temperature of the fluid in the radiator falls below a certain mark, the sensor will dispel and the fan will automatically turn off. But, as already mentioned, sometimes it does not always happen.

Causes of fan malfunction and their elimination

The reasons why the VAZ 2114 fan constantly works can be somewhat, namely:

• the wiring closure occurred;
• fan relay failed;
• the thermal sensor broke;
• there was a breakdown of the electronic unit.

Consider them in order.

Circuit

The first, and the most common cause of such a malfunction is a closure (and most often - the fusion) of wires going to the fan. As a result of this closure, the electrical circuit is included in no dependence on the operation of the thermal sensor and the relay. It is very easy to identify such a malfunction - it is enough to ring all the wires and check whether they are closed (in some cases, the fact of fusion of wires can be detected even visually when inspection).

If the "transvel" did not give results, the search for the reason should be continued, namely, check the fan relay. The easiest option of how to do is to dismantle the relay and install a new, similar model instead.

Although the price of this device is low, you can do without buying a new relay. It is enough just to borrow it for a couple of hours at a familiar motorist - the owner of the VAZ 2114, and after checking - return it back.

If after replacing the fan began to work in normal mode, then the old relay really turned out to be spoiled, and still will still buy and install a new one. If not, then you should proceed to check the temperature sensor.

Thermal catcher

The thermal sensor (it is also a coolant temperature sensor, it is a DH) - this is a device that reports the electron system. As already mentioned, it is whether it leads to the launch of the fan and its shutdown depending on the temperature of the radiator. It is not surprising that a broken thermal sensor is a frequent reason why the VAZ 2114 cooling fan does not turn off.

In this case, the system "thinks" that the temperature of the liquid is constantly high and does not fall (after all, the sensor is hung at the maximum), so that the command for turning off the fan does not arrive. To solve this problem, you will also have to purchase a new sensor and install it in place of the old. If the fan becomes properly, then the reason was in the sensor. If not, then the latter probable malfunction remains - electronic control unit.

Speaking about the excavation thermal sensor, it is worth noting one very important point. If the cooling fan works constantly, but the temperature on the dashboard is displayed correctly, then traveling on the car can be continued. If the fan is not turned off, and at the same time the device in the cabin shows the boiling of the coolant, then the rides should immediately stop and carry out the full diagnosis of the cooling system. This will help prevent engine overheating and its failure.

Electronic module

As already mentioned, if all other elements of the electrical circuit are good, but still does not turn off the VAZ 2114 fan, it remains to check the last important link - the electronic module. It is worth noting that it fails to be quite rare, but sometimes it still happens.

In this case, a solution to a solution to such a problem can be either a complete reset of all errors in the block or overlashing it. Since it is quite difficult to perform this at home, then the best option will be the appeal to the car service.

If you wish, you can install an additional button that will be forced to start and disconnect the fan.

In order to do this, you will need:

• purchase a button (or toggle switch) and mount it at any convenient place (even under the hood);
• make a branch from the wire going from the plus ankb to the fan relay, having sold another wire to it;
• connect this wire to the first contact button;
• connect the second contact of the button with a leg of the relay, from which the "plus" wire is moving to the fan.

Thanks to such a simple scheme, you can manage the fan operation manually.

Useful video

Additional interesting information you can learn from the video below:

Many people are wondering why the cooling fan constantly works or often turns on. After all, this is evidence of poor cooling system. This can lead to overheating of the motor and its failure. This problem is quite serious, in some cases, it will be necessary to even partially disassemble the engine. From how quickly you identify a malfunction, the coordinated operation of the power unit depends. No special skills are required for checking and repairing, any person will cope with it. The main thing is to know how to search for the cause of this behavior of the cooling system.

Why constantly works or often the cooling fan is turned on, it becomes clear from the principle of its action. It turns on the sensor located at the bottom of the cooling radiator. This sensor responds to an increase in the temperature of the coolant, as a result, the fan is turned on. It creates an additional air flow that enhances the cooling of the fluid in the radiator and, accordingly, the motor itself. Based on this, it becomes clear, the fan constantly works, only on overheating power units. To avoid engine failure, you must respond to the problem in a timely manner and eliminate it.

Thermostat

Overheating of the engine often happens due to the jamming of this element. The fan reacts to it, in the case of the encoding of the thermostat for half open. At the same time, the movement of fluid on the system slows down, which causes a decrease in the efficiency of heat removal. As a result, the engine begins to overheat, respectively, the temperature of the coolant increases. This reacts the fan power sensor. As a result, it works constantly.

Thermostat check is simply performed simply. The engine is breed, and warm it up to the thermostat valve response temperature. This indicator is indicated on the thermostat housing. We are waiting a little more, and check the temperature of the upper and lower nozzles. If both connections are evenly hot, then the reason for the permanent fan is found. For greater confidence, carefully inspect the thermostat valve, after removing the part from the engine. Eliminate the malfunction by replacing the thermostat for a serviceable spare part.

water pump

In many cases, the poor operation of the water pump becomes the reason for increasing the temperature of the coolant in the radiator. In this case, antifreeze slowly passes through the system and heats up too much. Finding into the radiator, it does not have time to cool to normal temperature, and goes according to the following circle, heating even stronger. If the pump is poorly working, then such a problem is expressed, only the permanent operation of the fan. If the pump refused completely, then in a few minutes the car will "boil". This is an extremely dangerous state that almost always leaves after itself the consequences in the form of engine problems.

Cooling System Channels

Quite often overheating causes congestion in the cooling system. It is often quite difficult to identify this problem. Therefore, at the first signs of the increase in the fan's inclusion without any reason, it should first rinse the system. In many cases, this turns out to be enough. Also, just in case, you can blow the radiator.

Usually, cleaning the radiator and cooling channels are made in conjunction with the replacement of antifreeze. For washing drain coolant. After that, a strong citric acid solution or water with special additives is poured. After the machine is half an hour to work. The spent cleaning agent is drained, and flooded fresh antifreeze. For the most part cases, such a procedure helps guaranteed to eliminate contamination in the cooling system.

Radiator pollution

All motorists know that the radiator is in front, and is blown away by the oncoming wind. Therefore, it is him that he gets all dust and dirt falling on the road. Gradually, this dust is assembled between the radiator plates, significantly worsening the heat transfer. Air flows, in this case, are much worse cooled liquid. It gradually heats up to a high level, and causes the power on the fan.

Repair in this case is simple, you need to clean the radiator. On many modern cars it will have to take it first, in some cases it is quite possible to get to him, without even removing it from the car. It is recommended to rinse it with flowing water. The easiest way is to use the hose. In some cases, it makes sense before washing the radiator with a soft, dry brush. Often this procedure is combined with the purge of the radiator.

Aerial traffic jams

It is no secret that the cause of excessive heating of the fluid is air traffic jams. They appear due to errors when replacing antifreeze, as well as due to leaks in the cooling system. As a result, the liquid warms unevenly, which leads to the unstable operation of the fan, with frequent inclusions when entering a hot liquid into the radiator.

Before troubleshooting, you must check the system for fluid leaks. By eliminating them, go to the pasture of the plugs. To do this, you will need a compressor. Unscrew from the throttle one of the tubes applying a coolant liquid. Next, you need to connect the compressor to the neck of the expansion tank, and squeeze air into it. Usually there are enough couples to drive all existing corks.

Circuit sensor. Quite often occurs the sensor closure. In this case, the fan or thrust, without ceasing, or is turned on significantly ahead of time. With such suspicions, you need to pay attention to the power on the fan, and compare the inclusion temperature with the standard one. If the temperature will be lower, then you just need to change the sensor and everything is normalized.

Warming on the winter. Many motorists put special insulation on the radiator in winter, it allows you to reduce the time of car heating, and save fuel. But, during thaws, the air temperature is high enough. In the presence of insulation, the engine is not cooled, which causes the fan to work more intensively. To eliminate the cause, simply remove insulation from the radiator.

Conclusion. The cooling system of the machine should always be in good condition. Therefore, the driver needs to closely monitor the state of this system. It is especially important to find the reason correctly, why constantly works or often turn on the cooling fan. This is certainly not a fatal problem, but neglecting this signal can lead to serious engine malfunctions.

The fan that turns on with a cold engine and is constantly working while driving is a fairly common problem, despite the appearance. Its reasons are usually prosaic, but sometimes they are associated with significant costs. This error occurred with our friend on Chevrolet Aveo T300, equipped with the same engine 1.2 Ecotec 86 HP as Opel Corsa D or A12XER. We took the car to our workshop to find the source of the problem. See what caused this confusion and what is the cost of this error.

The radiator fan is one of the key elements of the engine cooling system. It causes an intense air flow through the radiator core, sucking the air (the fan is located behind the radiator from the engine side). Its operation is especially important while driving around the city, which is accompanied by frequent stops of the car, which makes it impossible to cool the coolant by air, blowing the car. Over the past years, the design of the fans has changed, but today the most common fans are electric motors with an electric motor. The design of this type is usually controlled by the thermorel, screwed in the output (cooler) of the radiator tank. And it is this element that is most often a source of problems in the fan. Sometimes, however, the reason for bad fan operation lies elsewhere.

Engine fan is constantly working while driving

In the presented generation of Chevrolet Aveo II, the problem with the fan appeared once in the morning. When the engine starts, immediately turned on the fan, even if the engine was completely cold. The owner was additionally alarmed by the fact that during the ride the fan worked all the time, and a yellow engine light appeared on the clock. "Check engine." He decided to return the car to our mechanics Paul, who immediately took up the basic test of the technical condition of the car.

First of all, he decided to check the coolant temperature sensor. It sends a signal to the motor controller about the need to turn on or off the fan. To confirm your assumptions, Paul has connected a diagnostic scanner to verify errors registered by the engine controller. Soon it turned out that his diagnosis was true. The computer detected an error P0117, which indicates problems with the coolant temperature sensor.

Replacement fluid temperature sensor It is not a challenge (although much depends on how the engine is installed in the chamber). Most often, it is in the engine head and in its surroundings should be sought. When checking its condition, it is necessary to take into account the fact that the car may have a second so-called Fluid temperature sensor Located on the radiator itself.

So it was with the presented Aveo T300. However, the faulty sensor was located in the engine head, and access to it was very easy . This can be achieved by hand without removing the engine housing. Although Aveo T300 is more than the newest design of Opel Corsa, it is still a car with good access to the engine equipment. The second of the sensors, the so-called controlled, he, fortunately, was in good shape, but even access to it Aveo T300 is pretty good.

When replacing cooling fluid temperature sensor Coolant must be merge From the system, since the sensor is partially immersed in it. After replacing the sensor, fill in the system with a new coolant, release it and warm the engine.

Cost replacement of coolant temperature sensor

The coolant temperature sensor is a relatively cheap component, although much depends on the popularity of the car model. In the case of Chevrolet Aveo T300, the original part costs about 1,200 rubles. Ridex replacement can be purchased approximately 400 rubles, and 700 rubles for ABS.

Behind the sensor replacement, the authorized service center charges in the amount of about 160 zł. In an unauthorized workshop, the cost of the same service will be about 1,700 rubles. Therefore, the difference is obvious, especially if we take into account the relatively small amount of work required to perform work.

Often the engine fan is turned on - reasons

In the case of Chevrolet Aveo 1.2 Ecotec 86 HP, presented for the incorrect operation of its fan, consistent with a simple and easy fault. Therefore, the vehicle owner can talk about great luck. It happens that behind the symptoms of this type is faulty fan module . And this, unfortunately, is associated with a certain cost of repair! The module is an integral part of the fan, and in case of its failure, the entire fan is replaced! In the case of the presented Aveo, this means the cost of 30,000 rubles for the original part! And although it seems that this is a huge amount, compared to the fan for the BMW 520D E60 stands in the dealer center up to 48,000 rubles!