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Why does the Civic engine make loud noises when the air conditioning is on?

1 Answers

VanAvery

07/29/25 4:43pm

Civic engine making loud noises when the air conditioning is on may have the following reasons: 1. Throttle valve dirty or stuck: When the air conditioning is working, the compressor also operates, and the compressor is driven by the engine, so turning on the air conditioning increases the engine load. 2. Air conditioning pump abnormal noise: There are two main reasons for air conditioning pump abnormal noise: electromagnetic clutch and air conditioning pump internal bearings. Electromagnetic clutch noise is mainly caused by wear leading to increased clearance, while air conditioning pump bearing noise is mainly due to lack of lubricating oil. 3. Compressor drive belt tension issues: 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.

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