What phenomena will occur if the electronic fan of a car breaks down
A damaged electronic fan in a car can cause a sharp increase in engine temperature, leakage or cracking of the radiator, splashing of coolant, and in severe cases, irreversible damage such as engine sticking to the cylinder .
Youdaoplaceholder0 Fault phenomena and diagnosis methods
Youdaoplaceholder0 Core fault manifestations :
Engine temperature surges: The electronic fan fails to dissipate heat, causing the temperature of the radiator and engine to rise, the water temperature alarm on the dashboard, and a decrease in power.
Water tank leakage or explosion: Excessive pressure in the cooling system causes the water tank to rupture and the coolant to leak, hindering the water circulation.
Engine cylinder sticking risk: High-temperature coolant splashing into the engine interior can cause components to stick together and get stuck, which may lead to engine scrapping.
Abnormal air conditioning system: Excessive pressure in the high-pressure pipeline may cause a pipe burst.
Youdaoplaceholder0 Electronic fan self-fault diagnosis :
Observation: Check if there are any scorch marks on the motor vent coil.
Smell: Identify the odor of burnt or melted plastic.
Manual test: Check if it is difficult or smooth to turn the shaft, or if the surface temperature rises rapidly.
Operating status: When the water temperature reaches above 80℃, the electronic fan should be activated. If there is no rotation or wind blowing sensation, it indicates a fault.
Youdaoplaceholder0 Fault cause and handling
Common causes include fan motor aging, sensor signal distortion or relay failure. Immediate maintenance is required to prevent serious damage to the engine.
The working principle of automotive electronic fans is based on the joint control of coolant temperature and the air conditioning system, and the rotational speed is adjusted through components such as thermal switches and thermostats. During maintenance, key components such as circuits, motors, and blades need to be inspected.
Working principle
The electronic fan monitors the coolant temperature through a dual-temperature thermal switch. It starts to operate at low speed when the water temperature reaches around 90°C and switches to high speed when it exceeds 95°C. When the air conditioner is turned on, the air conditioner pressure sensor will additionally trigger the fan to work, but the air conditioning system and the cooling system are independently managed by different control modules.
Maintenance methods
Youdaoplaceholder0 Circuit inspection : Confirm that the fuses, relays (such as relay No. 217), and circuits have no short circuits or open circuits.
Youdaoplaceholder0 component testing :
The motor has no abnormal noise or jamming, and the blades have no deformation or foreign objects.
Clean the dust on the surface of the fan to ensure heat dissipation efficiency.
Youdaoplaceholder0 special case handling :
If the fan only operates at high speed, it may be due to the burnout of the relay (such as the fault of relay No. 217 in the case).
If the water temperature is abnormal but the fan does not start, it is necessary to check the water temperature sensor or thermostat.
The damage of an electronic fan in a car can have a significant negative impact on the vehicle, mainly manifested as an increased risk of engine overheating, a decreased efficiency of air conditioning cooling, and in severe cases, it may lead to mechanical failures such as engine cylinder sticking or scrapping.
Youdaoplaceholder0 main effects and manifestations
The automotive electronic fan is a core component of the cooling system and is responsible for regulating the engine temperature. Once damaged, the following problems will be caused:
Youdaoplaceholder0 Engine cooling efficiency decline : The electronic fan cannot dissipate heat properly, causing the temperature of the engine and radiator to rise sharply, affecting the normal operation of the engine. In the long term, it may cause mechanical wear or performance degradation.
Youdaoplaceholder0 Reduced efficiency of the air conditioning system : Fan failure will indirectly affect the heat dissipation of the air conditioning condenser, resulting in weakened cooling effect and reduced ride comfort.
Youdaoplaceholder0 risk of severe mechanical damage :
The engine radiator may burst due to high temperature, causing water leakage and water circulation disorders.
In extreme cases, coolant splashing or engine sticking to the cylinder can cause permanent engine damage.
Youdaoplaceholder0 Fault Diagnosis and Response suggestions
Youdaoplaceholder0 judgment method : After starting the vehicle, if you cannot hear the fan running sound in the engine compartment or the water temperature gauge abnormally rises, it may indicate that the electronic fan is faulty.
Youdaoplaceholder0 Maintenance necessity : Immediate replacement or repair is required to prevent the engine from being scrapped due to the failure of the cooling system. Regular checks on the fan's condition and cleaning of the air conditioner filter can prevent malfunctions.
If you want to know more, keep reading the other articles on this site!
Please call us if you need such products.
Zhuo Meng Shanghai Auto Co., Ltd. is committed to selling MG&MAXUS auto parts welcome to buy.
