What to do if the cooling fan is constantly running: causes, solutions, and recommendations

There are a lot of important components in the car and the quality of the car's performance depends on how well they work. One such is the cooling system. Often on some models it happens that the cooling fan is constantly working. This is not a good sign. Insufficient cooling of the engine can lead to overheating of the motor - and this, in turn, can pour the owner into a large sum for major repairs. But if you know the reasons for this work in the cooling system, you can quickly identify where the fault is hidden and eliminate it. In order to find a breakdown, do not need special knowledge and skills. Even a beginner can cope with this. There are not many reasons why the cooling fan is constantly running.

The principle of the fan in the cooling system

One of the reasons that a fan can constantly work or turn on frequently, is in principle the operation of the system. The fan is started by the command of a special sensor. It is located on the bottom of the radiator. This sensor is responsible for the temperature of the coolant. If it is more than necessary, then the radiator fan will start. When its blades rotate, an additional air flow of air is created. It helps to lower the temperature of the coolant, which then passes through the channels in the engine. The cooling fan constantly works only on motors, which for some reason overheat. To avoid serious problems, you must immediately respond to this problem.

Thermostat

The engine can overheat due to the fault of the thermostat. It often happens that the mechanism of this element is wedged. The fan, in turn, necessarily reacts to this. The thermostat itself remains open only halfway. As a result, the cooling liquid can not efficiently remove heat from the engine, as its movement through the system slows down. When the power unit overheats and the coolant temperature rises, the sensor responds to this event and starts the fan. Often with such a problem owners of cars "Opel Astra" collide - the cooling fan constantly works. And the problem is solved by replacing the thermostat.

How to check the cooling system thermostat

It's quite easy to test it. To do this, it is necessary to start the engine and heat it to such temperatures when the valves of this mechanism work. You can find out the temperature threshold directly on the device case. Usually it is 72 or 80 degrees. Then it is necessary to check the temperature at the lower and upper nozzle. If both have approximately the same temperature, then the reason why the cooling fan is constantly running is found. It is recommended to carefully inspect the thermostat valves after dismantling. Repair this site is useless (easier and cheaper to buy a new one). By the way, if this element is dismantled, it can be checked without installation in the car. To do this, the thermostat is placed in a container with water, which is then heated. By increasing, the valve should open. If this does not happen, the device has failed.

Cooling pump

Sometimes the reason that the cooling fan constantly works and does not turn off is the water pump. The temperature of the coolant in the radiator is increasing, because the speed of its movement is slowed. When the liquid enters the cooling radiator, the antifreeze simply does not have time to cool down to the right temperatures and passes to the next circle. In this case, the liquid warms up even more. When the pump somehow works, the fan can report a problem. If the pump has finally broken down, then the engine will immediately boil - this usually causes serious problems and expensive repairs.

Pump Faults

Often, the pump does not stop working suddenly. Initially, the pump gives various signals about breakdowns - for example, the cooling fan of the engine is constantly running or is often turned on.

The main reason for the failure of the pump is a bearing - it jams or is destroyed. The fact that the pump is out of order can be understood from the characteristic sounds from under the hood. They are like a howl or a knock. These sounds can be heard even at idle. Beginners often do not pay attention to these noises. Pumps of the pump are taken for a malfunction of the camshaft. To repair the fault, the pump must be replaced. Depending on the model, you can install only the front of the pump and replace the bearing.

Choked channels of the cooling system

Often the motor is subjected to a break due to congestion in the cooling system. The situation is complicated by the fact that diagnosing this problem can be quite difficult. Therefore, if the cooling fan is constantly running or turning on more often than usual, washing the SOD channels will not be superfluous. In most cases, these activities are more than enough to make everything work correctly. Also, experts recommend not only to rinse, but also to blow the radiator.

How to clean the cooling system

When cleaning the channels of the cooling system and radiator also replace the antifreeze. To perform the washing, the old antifreeze should be drained. Then a sufficiently strong solution based on citric acid is poured into the system. This is an effective folk remedy, but there are also various liquids with additives. After this, the engine is turned on - so the car should work for 30 minutes. This is enough to thoroughly clean all the channels. Then you can muffle the motor, drain the cleaning mixture, and finally pour in the fresh antifreeze. Often this way it is possible to completely solve the problems in the operation of the cooling system, if the causes are in the contamination.

Clogged radiator

Car owners with experience know that the radiator is installed in the front of the car. When driving, it is blown by the wind and air from the street. It is also on the radiator that you have all the dirt and road dust. The poplar fluff, feathers of birds and much more accumulate on the element. Over time, all this debris is clogged inside the plates, thereby reducing the efficiency of heat exchange. Counter-flow of air badly cool antifreeze. It heats up and the cooling fan constantly works.

How to rinse the radiator

To fix the situation and to protect the motor from the harmful overheating, it is recommended to clean the element. On most modern cars, you first need to dismantle the part, but often you can perform cleaning without dismantling. Specialists recommend cleaning with ordinary water. It is best if it is fed through a hose. Sometimes it makes sense to clean the radiator cells with a brush and then rinse. Often this procedure is combined with blowing the radiator with compressed air.

Air-cork in the cooling system

For experienced car owners, air congestion is not a secret. They arise because of some errors in the process of replacing the coolant. Also causes leakage in the system. Antifreeze can not evenly warm up. This leads to instability in the fan. It often turns on or does not work at all - the hot coolant gets into the radiator. Before trying to eliminate these same plugs, you need to check the system for leaks. If they are found, then they should be eliminated. Next, you need to remove the plugs. This requires a compressor. From the throttle unscrew one tube, which brings the liquid. Then the compressor is connected to the neck of the expansion tank and the air supply starts. Two or three minutes will be enough to leave all the traffic jams.

Problems with the temperature sensor

If the cooling fan is constantly working on the VAZ 2107, it is often the fault of the radiator temperature sensor both on the carburetor and on the injector cars. In most cases, it is simply in a closed state. If the symptoms are just such, then check the time at which the fan turns on, and compare the temperature when it turns on with the standard. If the indicators are lower, the problem can easily be solved by replacing the sensor.

Warming for the winter period

Many motorists during the winter try to insulate the radiator - there is an opinion that this way the engine will warm up more quickly and it will be possible to save fuel. However, during thaws the air temperature rises. If a heater is installed, the engine will not be able to cool effectively. This may be the answer to the question of why the radiator cooling fan is always running . But this is a rare enough reason.

Summarize

So, among the most popular reasons for which the fan is unstable, you can identify problems with electronics. This is what most car owners complain about in profile forums. Many solve this problem by replacing the sensor and fuses. And it helps. In half the cases, the problem can be solved by replacing the thermostat. Also, the situation can be improved by cleaning the radiator. Problems happen on any cars, this issue worries the owners of cars "Ford Focus". The cooling fan is constantly working and on luxury cars. It is important to notice this problem in time, otherwise it can lead to disastrous consequences. If the engine is overheated, only the overhaul will be able to help with the replacement of cylinder head, cylinders, pistons and other components.