Auto Electric Fan

Auto Electric Fan

electric fan parts

The auto electric cooling fan is composed of a car fan motor and a car fan blade.

The fan blades are made of OEM raw material. The armature & spindle are made using the technology which is fully automatic & swing & stack-up. The rear cover for the outer casing of the motor is done with surface treatment which is in conformity with European environmental standards. The carbon brush for the motor is made in Germany or France. The product undergoes tests of high/low temperature, wind tunnel, the performance of electric water pump, hardness, the performance of motor, and dynamic balance. The stable quality and compact packaging bring no worry about the collision or extrusion caused by goods delivery.

There are mainly two types of an auto electric fans, one is the radiator cooling fan, the other is the condenser cooling fan.

Auto Electric Fan

Radiator cooling fan

The automobile engine must be appropriately cooled in a high-temperature working environment to keep it working at an appropriate temperature to meet the requirements of good engine performance, durability, and exhaust emissions.

The function of the radiator cooling fan is to let more airflow through the radiator, enhance the heat dissipation capacity of the radiator, speed up the cooling rate of the coolant, and at the same time allow more air to flow through the engine to take away the heat emitted by the engine.


The engine cooling fan is an important part of the vehicle cooling system, it is mainly used for engine heat dissipation and coolant heat dissipation to ensure that the engine does not cause high temperature and malfunction.

The performance of the radiator cooling fan directly affects the heat dissipation effect of the engine, which in turn affects the performance of the engine. If the fan is not selected properly, it will result in insufficient or excessive cooling of the engine, resulting in deterioration of the working environment of the engine, which in turn affects the performance and service life of the engine. In addition, the power consumed by the fan accounts for about 5% to 8% of the engine's output power. Under the trend of pursuing environmental protection and low energy consumption, fans are also attracting more and more attention.

Causes of common problems of radiator cooling fan

1. Whether the water temperature meets the requirements: Today's car radiator fans are mostly operated by electronic temperature control. Therefore, generally, only when the water temperature in your car reaches a temperature that meets the requirements, the fan will start to rotate normally. If it is too low, the radiator fan cannot rotate. Therefore, when your car's radiator fan fails to turn, you should first check whether the water temperature meets the requirements.

2. Relay failure: If the water temperature meets the requirements, the car radiator fan still cannot work, then there may be a problem with the fan relay. If the relay fails, the car radiator fan will not work.

3. There is a problem with the temperature control switch: if there is no problem with the above two aspects, then you must check the temperature control switch. Sometimes there will be some malfunctions in this place, which will also cause the operation of the car radiator fan. A certain impact, so you should also pay attention to inspection.

radiator cooling fan

AC Condenser fan

The air conditioning condenser is a component that converts the refrigerant from gas to liquid so that it can flow through the air conditioning system. Since the basic function of the condenser is as a heat exchanger of the air conditioning system, a large amount of heat will be released during the process of changing from a gaseous state to a liquid state. If the condenser becomes too hot, it will not be able to convert the refrigerant into the form of coolant needed to produce cold air. The AC condenser fan is designed to keep the condenser cool so that it can continue to efficiently convert gas into a liquid and keep the AC system running normally. A defective fan can cause problems in the entire AC system.


Signs of AC condenser fan failure

Usually, when the condenser fan fails, the vehicle will show some symptoms.

1. The air is neither cold nor hot

The first symptom of a fan failure is that the air coming from the vent becomes hot. This problem occurs when the condenser becomes too hot and can no longer convert the refrigerant into a cooled liquid form. Since the fan is designed to prevent the condenser from becoming so hot, hot air from the vent is one of the first signs that the fan may not be able to cool the condenser.

2. The car overheats when idling

Another symptom that may occur when a fan fails is that the vehicle overheats when idling with the air conditioner turned on. During the conversion process, the air conditioner condenser will generate a lot of heat, which will affect the overall temperature of the engine, enough to cause overheating. Generally, once the vehicle moves, the overheating will subside due to the increased airflow and the cooling received by the condenser as the vehicle moves.

3. There is a burning smell when the air conditioner is turned on

Another more serious symptom of a condenser fan failure is that the vehicle starts to emit a burning smell. When the condenser overheats, all components of the air conditioning system will start to overheat until they eventually become hot enough to burn and give off an odor. The longer the component overheats, the greater the damage caused. Therefore, if a burning smell is detected when the air conditioner is turned on, be sure to check the system as soon as possible.

Since the condenser fan cools such an important part of the air conditioning system, if you find that your air conditioner is not working, be sure to pay attention to its operation. A malfunctioning fan will not only fail to produce cold air but will even damage the air conditioning system due to overheating. If you suspect that there is a problem with the condenser fan, be sure to ask a professional technician to inspect the vehicle. If necessary, they will be able to replace your AC condenser fan to repair your car's AC system.

Signs of AC condenser fan failure

Electric fan drive method

There are two ways to drive the fan: direct drive and indirect drive.

Direct drive

Direct drive means that the fan is directly installed on the engine crankshaft, or the crankshaft drives the fan to rotate through a belt or gear. Most trucks and construction machinery use this driving method. As long as the engine is running, the fan rotates synchronously with the crankshaft. It should be noted that this driving method will greatly consume the power of the engine. Calculations show that the fan consumes 10% of the engine's power at maximum.


In order to reduce the power consumption of the engine by the fan, and at the same time avoid overcooling which leads to overcooling of the engine and the engine heating time is too long, the current engine generally uses a fan clutch to control the working time and rotation speed of the fan. The fan clutch is composed of a front cover, a housing, a driving plate, a driven plate, a valve plate, a driving shaft, a bimetallic temperature sensor, a valve plate shaft, a bearing, a fan, etc. Its working principle is to feel the water tank by a bimetallic plate The temperature is controlled by the deformation of the bimetal to control the timing and angle of valve opening. When the temperature of the water tank is low, the valve plate is closed, the silicone oil does not enter the working chamber, the fan is separated from the driveshaft, does not rotate, and the cooling intensity is low; The high viscosity makes the fan and the drive shaft combined, and the two rotate synchronously, the fan speed is higher, and the cooling intensity is higher. The greater the opening angle of the valve plate, the more silicone oil enters the working chamber, the closer the fan and the drive shaft are combined, and the higher the fan speed, thus realizing the adjustment of the cooling intensity.


If the fan clutch cannot be combined with the drive shaft due to a certain failure, the fan cannot always rotate at a high speed, and the cooling intensity is low. When the car is running under high load, it may cause an excessive temperature failure. In order to avoid such a situation, there is an emergency device on the fan clutch and a locking plate on the housing. As long as the pin of the locking plate is inserted into the hole of the active plate and the screw is tightened, the housing can be connected to the drive shaft. As a whole, the fan runs synchronously with the drive shaft. But at this time, it only depends on the pin drive and cannot be used for a long time, and the fan is always at the highest cooling intensity, which is not conducive to the warm-up of the engine. One way to judge the failure of the fan clutch is: when the engine temperature is normal, rotate the fan blade by hand. If you can feel a greater resistance, the fan clutch is normal; if the fan clutch has a small resistance at this time, it can be rotated easily, It means that the fan clutch has been damaged.

electric fan clutch

Indirect drive

There are two indirect drive modes of the fan, one is electric and the other is hydraulic.

Firstly electric ones.

The auto cooling fans of most cars and passenger cars are electric, that is, a motor is used to directly drive the rotation of the fan. The electric fan has a simple structure, convenient layout, and does not consume engine power, which improves the fuel economy of the car. In addition, the use of electric fans does not require inspection, adjustment, or replacement of the fan drive belt, thus reducing the workload of maintenance. There are two electric fans on general models. The two fans are the same size, one large and one small. Some models have an air conditioning condenser fan. They decide the fan based on the engine water temperature and whether the air conditioner is turned on. Start-up and operating speed of the machine.

radiator fan double

Early electric fans had relatively simple control circuits and control logic. They were only controlled by temperature control switches and air-conditioning pressure switches, meeting the conditions of any switch and automatically turning on the fan. The temperature control switch is installed on the water tank to directly feel the temperature of the coolant. It is actually a two-level resistance switch. The internal resistance is divided into two levels, which control the fan's high and low-speed operation. When the water temperature exceeds 90°C, the first gear of the temperature control switch is turned on, and the fan rotates at a low speed, which has a low heat dissipation capacity for the water tank; when the water temperature exceeds 105°C, the second gear of the temperature control switch is turned on and the fan rotates at a high speed. Increase the airflow through the water tank and increase the cooling intensity. If the air conditioner is turned on, the air conditioner pressure switch will directly give a signal to the electric fan, and the electric fan runs directly, regardless of the water temperature.

control logic of electric fan

Today's automotive electronic control systems are becoming more and more complex, and the control logic of electric fans is also becoming more and more complex. Generally, the engine control unit is used to control the start and operation of the electric fan, and the parameters of the engine and its surrounding environment are considered comprehensively. There is an emergency operation mode, which is more energy-efficient, so as to achieve the purpose of energy-saving and consumption reduction. But this also brings the disadvantages of complicated signal control and difficult maintenance. For example, the engine coolant temperature signal is missing, the water tank outlet temperature signal is missing, the engine control unit will instruct the electric fan to run at high speed to prevent the engine from high temperature; the air conditioner high-pressure sensor signal is missing, and the air conditioning system will be instructed to stop working; there is a very special situation, That is when the vehicle speed signal is missing, the engine will mistakenly think that the car has been driving at a high speed, and the electric fan will also be commanded to rotate at a high speed.

Another indirect fan drive method is hydraulic drive, which is mainly used in excavators and some air-cooled engines. The fan is installed on a hydraulic motor. When the engine starts and the temperature reaches a certain level, the oil circuit of the hydraulic motor is connected and the motor runs to drive the fan to rotate to provide cooling airflow for the engine. The rotation speed of the fan can be controlled by a hydraulic motor, the rotation speed is low when the water temperature is low, and the rotation speed is high when the water temperature is high. The hydraulic motor power of the excavator comes from the hydraulic pump, and the hydraulic motor power of the air-cooled engine comes from the oil pump.

hydraulic drive fan