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What Causes the Hissing Sound Like Air Leakage When the Car Air Conditioner is On?

1 Answers

ZoeAnn

07/29/25 12:26pm

Car air conditioner making unusual hissing sound when AC is turned on can be caused by the following reasons: Belt Slippage: The air conditioner 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 a hissing sound. Air Conditioner Compressor Failure: When the AC switch is turned on, the air conditioner compressor starts operating. If the compressor is damaged (e.g., due to abnormal clutch operation), it may produce a hissing sound. Foreign Objects in the Air Duct: If there are foreign objects in the air conditioning system's duct, they may rotate with the blower's airflow and repeatedly hit the air filter, causing a hissing sound. Solutions for air conditioner noise: Belt Slippage: If the issue is caused by the belt, simply replace the belt. If the problem lies with the tensioner, replace the tensioner. Compressor Failure: Currently, both 4S shops and repair shops opt for direct replacement when dealing with compressor failures. Foreign Objects in the Air Duct: If there are foreign objects in the duct, remove the air filter and carefully inspect and clean any foreign objects inside the duct.

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