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What Causes Abnormal Noise When Turning On the AC in a Car?

1 Answers

TannerFitz

07/29/25 7:37pm

The reasons for abnormal noise when turning on the AC in a car include belt slippage, air conditioning compressor failure, or foreign objects in the air ducts. Below are detailed explanations: 1. Belt Slippage: The air conditioning compressor is driven by the engine crankshaft via a belt. If the belt becomes loose, aged, severely worn, or if the tensioner lacks sufficient tension, it can cause the belt to slip, resulting in abnormal noise. If the issue is due to the belt, simply replacing the belt will suffice. If the problem lies with the tensioner, then the tensioner needs to be replaced. 2. Air Conditioning Compressor Failure: When the AC switch is turned on, the air conditioning compressor starts operating. If the compressor is damaged, it may produce abnormal noise. In such cases, it is recommended to visit a 4S shop for part replacement and repair. 3. Foreign Objects in the Air Ducts: If there are foreign objects in the air conditioning system's ducts, these objects can rotate with the blower's airflow and repeatedly hit the air filter, causing abnormal noise. In this situation, the air filter can be removed, and the air ducts should be carefully inspected and cleaned of any foreign objects.

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