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What Causes the Loud Roaring Noise When the Car Fan Turns On?

1 Answers

Hope

07/29/25 5:16pm

When the car fan turns on and produces abnormal noise, it is usually caused by deformed fan blades, a damaged motor, or dirt and blockage in the air conditioning system. The fan automatically activates when the coolant temperature reaches above 95 degrees Celsius. If the fan blades are deformed, it will create a very loud noise during rotation. Similarly, a damaged fan motor can cause irregular fan speed, leading to abnormal noise. Dirt and blockage in the air conditioning system can result in excessive airflow noise. It is recommended to clean the air conditioning system. Typically, the cabin air filter should be replaced every 10,000 to 20,000 kilometers. If the car operates in a dusty environment, the replacement interval should be shortened. The air conditioning system's pipes may also become moldy or clogged with debris over prolonged use, so it is advisable to clean them every 30,000 to 40,000 kilometers. The car air conditioning system mainly consists of a refrigeration system, heating system, air delivery system, control system, and air purification system. The refrigeration system includes components such as the evaporator, air conditioning compressor, condenser, liquid storage tank, expansion valve, and high/low-pressure pipelines. The heating system comprises the heater core, water valve, and blower motor. Its working principle involves detecting signals from various sensors, such as interior temperature, evaporator temperature, and engine coolant temperature, to output control signals. These signals regulate the radiator fan, condenser fan, compressor clutch, blower motor, and air control motor to achieve automatic temperature control inside the vehicle.

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