Is it normal for the engine noise to increase when the car's air conditioning is turned on?

[DiJason]

It is not normal. Here are the possible reasons why the engine noise increases when the car's air conditioning is turned on: 1. Dirty or stuck throttle valve: Turning on the air conditioning increases the engine load, requiring the throttle valve to open wider to allow more air intake. If the throttle valve has carbon deposits or is stuck, it can cause engine shaking and abnormal noises. 2. Improper tension of the compressor drive belt: If the drive belt tension is incorrect, it can cause abnormal noises 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 may slip; if the drive belt is too tight, the load on the electromagnetic clutch will increase.