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Why Does the Car Belt Make Noise When the Air Conditioner Is On?

2 Answers

DelKaleb

07/29/25 2:53am

Car belt noise when the air conditioner is on can be caused by the following reasons: 1. Check the belt tension. If the car belt is loose, it may produce a squeaking noise, and timely adjustment of the belt tension is required. 2. High pressure in the air conditioning system. When the air conditioner is turned on, the pressure in the system increases rapidly, requiring professional inspection and adjustment. 3. Slipping of the air conditioning belt. This could be due to poor belt quality or improper installation technique. Before installing the belt, the pulley should be cleaned thoroughly using a cloth or gloves. Avoid touching the new belt with oily hands, as contact with oil can cause oxidation and lead to slipping. It is recommended to replace the belt at a professional auto repair shop.

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LeTravis

08/12/25 6:48am

I've encountered the squealing noise from the belt when turning on the AC while driving several times. It sounds like metal friction or a sharp hissing, mainly caused by a loose or aged belt. The car belt is responsible for driving the AC compressor, and it's prone to slipping under heavy load. Common causes include belt loosening after prolonged use, cracks, or moisture-induced slipping. You should promptly check the belt tension and adjust it with a tensioner if too loose. Additionally, misalignment or wear of the pulley can amplify the noise. Ignoring it for too long may lead to belt breakage, affecting AC cooling and even engine safety. I recommend checking the belt condition every six months and addressing any unusual noises at a repair shop immediately. Also, drying the belt area after car washes can prevent slippery noises.

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