What are the reasons for a sudden loud noise from the car fan?
3 Answers
Reasons for a sudden loud noise from the car fan: 1. The blades of the exhaust fan inside the air conditioning system are deformed, and it is recommended to replace the exhaust fan. 2. The motor of the exhaust fan inside the air conditioning system is damaged, and it is recommended to replace the exhaust fan. 3. There are many impurities inside the air conditioning system, and it is recommended to clean the air conditioning system. Here is some additional information: Car radiator: The car radiator consists of three parts: the inlet chamber, the outlet chamber, and the radiator core. The coolant flows inside the radiator core, while air passes outside the radiator. The hot coolant cools down as it dissipates heat to the air, and the cold air heats up as it absorbs the heat dissipated by the coolant.
Last time I was driving, the fan suddenly made a loud noise, which startled me. This situation usually stems from a problem with the cooling system. When the engine overheats, the fan operates at high speed to cool it down, resulting in significantly increased noise. Common causes include a clogged radiator, insufficient coolant, or foreign objects stuck in the fan blades, such as leaves or debris. Additionally, worn-out bearings in the fan motor can also cause a screeching sound. Long-term neglect of maintenance, such as not replacing the coolant or cleaning the radiator, can easily lead to such fan issues. I recommend first stopping the car to check if the coolant level is normal and clearing any debris around the fan blades. If the noise persists, it's best to drive to a repair shop to have the motor and wiring checked. For safety, don't push through and continue driving, to avoid serious engine damage.
When I was young, I experienced a sudden loud noise from the fan, which made me very nervous. In most cases, abnormal fan noise is caused by circuit faults or motor aging. Loose wires, short circuits, or blown fuses connected to the fan can cause the fan speed to go out of control and the noise to increase. The air conditioning system can also make the fan spin at high speed under heavy load, generating noise. Another possibility is excessively high voltage affecting the fan's operation. When dealing with it, I first turn off the air conditioning to lower the cabin temperature and observe the effect. If that doesn’t work, I then check the circuit or replace the fan motor. During regular maintenance, remember to have the technician inspect the fan components to prevent unexpected issues.
