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What Causes the Squeaking Noise from the Car Air Conditioning Compressor Belt?

2 Answers

Michelle

07/29/25 10:48pm

The electromagnetic clutch of the compressor is a common source of abnormal noise: The compressor frequently operates under high load conditions, transitioning from low to high speeds, which places high demands on the electromagnetic clutch. Additionally, the electromagnetic clutch is usually installed close to the ground and often comes into contact with rain and mud. When the bearings inside the electromagnetic clutch are damaged, abnormal noise occurs. The solution is to repair the bearings of the electromagnetic clutch. The tightness of the compressor drive belt also directly affects the lifespan of the electromagnetic clutch, leading to abnormal noise: If the drive belt is too loose, the electromagnetic clutch is prone to slipping. If the drive belt is too tight, the load on the electromagnetic clutch increases. Improper belt tightness can cause the compressor to stop working in mild cases or lead to compressor damage in severe cases. When the drive belt is operating, if the compressor pulley and the generator pulley are not aligned in the same plane, it can reduce the lifespan of the drive belt or the compressor. The solution is to adjust the tightness of the compressor drive belt.

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DeVivienne

08/16/25 12:15am

I've been driving for decades and often encounter squealing noises from the air conditioning compressor belt, mostly due to belt looseness or excessive wear. When the belt ages and hardens, it slips against the pulley during rotation, causing noise, which is more noticeable in rainy weather because moisture increases slippage. Problems with the compressor, such as a bad bearing or an uneven pulley surface, can also cause uneven load and louder noise. I've tried adjusting the tension myself in the past and used soapy water as a temporary fix. If the belt is about to break, it must be replaced—normally every 50,000 to 100,000 kilometers. If not addressed in time, a broken belt will stop the air conditioning completely, making summer driving unbearably hot. It's advisable to regularly check the belt tension and have it replaced by a professional shop with a high-quality belt for peace of mind. From my experience, it's a minor issue that can easily escalate into a major problem, so fixing it early saves both hassle and money.

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