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What Causes the Loud Noise from the Car Fan?

2 Answers

SilasMarie

07/25/25 12:20pm

The loud noise from the car fan is mainly caused by three reasons. Below is a detailed explanation of these three causes: 1. Exhaust fan blades: The exhaust fan, driven by an electric motor, rotates the blades to drive airflow, facilitating air exchange between indoor and outdoor environments as part of an air conditioning appliance. When the blades of the exhaust fan inside the air conditioner become deformed, it can result in a louder noise, and it is recommended to replace the exhaust fan. 2. Exhaust fan motor: The purpose of exhaust is to remove stale indoor air and regulate temperature, humidity, and comfort. If the motor of the exhaust fan inside the air conditioner is damaged, it can lead to a louder noise, and it is recommended to replace the exhaust fan. 3. Excessive debris: If there is a significant amount of debris inside the air conditioner, it is advisable to clean the air conditioner.

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EvaAnn

08/11/25 8:18pm

Recently, my car's fan has been making unusually loud noises. After checking, I found there are several common reasons for increased fan noise. Dust accumulation or deformation of the fan blades can cause a harsh sound due to unbalanced airflow. Another possibility is a clogged radiator, forcing the fan to work harder to cool down, naturally resulting in louder noise. On the electronic control side, a malfunctioning temperature sensor can cause the fan to run at high speed continuously. Additionally, if the fan motor's bearings are worn out or lack lubrication, it can also produce significant noise. This situation needs prompt attention, as it could lead to engine overheating. Last month, I cleaned the blades myself, and the noise reduced, but it's still safer to have it checked by a professional. It's important to regularly monitor the fan's condition while driving to prevent issues.

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