Why is the air conditioning engine making loud noises?

[FranciscoAnn]

If the sound is not particularly loud, it is a normal phenomenon. Here is an introduction to the relevant content: Specific reasons: Turning on the air conditioning increases the engine load, and the fan operates at high speed, so the sound will be louder. Especially when idling during cooling, the engine automatically increases fuel injection to enhance power and drive the compressor, which can make the engine noise more noticeable. Abnormal noise from the air conditioning pump: Any issue with the electromagnetic clutch or the bearings inside the air conditioning pump can cause abnormal noise. The noise from the electromagnetic clutch is mainly due to wear, leading to increased gaps, while the noise from the air conditioning pump bearings is primarily caused by a lack of lubrication.