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What Causes the Belt Noise When the Car Air Conditioner is On?

2 Answers

BellaDella

07/24/25 1:39pm

Car air conditioner belt noise is caused by the belt being loose and slipping. When the belt slips, it produces a screeching sound. Once the belt slips, the friction and high temperature will cause the belt to stretch further, leading to more severe slipping and creating a vicious cycle. Below are specific details about the air conditioner belt: 1. Introduction: The air conditioner belt drives the air conditioner compressor clutch through belt transmission, allowing the entire air conditioning system to function properly for cooling. The belt also drives the alternator, which starts working and charges the battery. The air conditioner fan, relays, headlights, wipers, and radio cigarette lighter then operate using the power stored in the battery. 2. Replacement Interval: The replacement time varies among different car brands. Refer to the car's manual for specific guidelines and replace the belt accordingly. Generally, the lower limit for replacement is around 60,000 kilometers or 5 years. It is recommended to replace the belt in advance as it approaches the specified replacement time.

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SanLandon

08/11/25 7:39am

I've been driving for twenty years and have encountered many instances of squeaky air conditioning belts. That time when I went to the beach, as soon as I turned on the AC, I heard a squeaking sound—my friend said it sounded like a mouse. Upon inspection, I found the belt was loose. The high summer temperatures and humidity increased friction, making the belt slip more noticeably. When the compressor starts, the load is heavy, and if the belt tension is insufficient, it's prone to noise. If the belt is old with many cracks or contaminated with oil, the noise is even louder. I recommend car owners to perform regular visual inspections. Press the middle of the belt with your finger—if it can be easily pressed down more than half a centimeter, it means it's loose and the tensioner needs adjustment. Ignoring it could lead to the belt breaking, which could damage the AC system or even engine components. Don't underestimate this noise.

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