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What Causes the Engine to Sound Louder When the Car's Air Conditioner is On?

1 Answers

Morgan

07/30/25 3:17am

Reasons for the engine sounding louder when the car's air conditioner is on include abnormal noise from the air conditioning pump, dirty throttle valve, and improper tension of the compressor belt. Abnormal Noise from the Air Conditioning Pump: Any issue with either the electromagnetic clutch or the bearings inside the air conditioning pump can cause abnormal noise. Noise from the electromagnetic clutch is mainly due to wear and tear, leading to increased gaps. Noise from the air conditioning pump bearings is primarily caused by insufficient lubrication, which in severe cases can lead to the pump burning out and failing to perform cooling functions. Dirty Throttle Valve: Turning on the air conditioner increases the engine load, requiring the engine to increase the throttle opening to allow more air intake. If the throttle valve has carbon deposits or is stuck, it can cause engine shaking and abnormal noise. Improper Tension of the Compressor Belt: When the tension of the drive belt is incorrect, it can cause abnormal noise in mild cases or damage the air conditioning compressor in severe cases. The principle is that if the drive belt is too loose, the electromagnetic clutch will slip; if the drive belt is too tight, the load on the electromagnetic clutch will increase.

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