Why do cars make a loud noise when they turn on the air conditioning engine in summer?

Here's a detailed introduction to the reason why the air conditioning engine is noisy in summer: 1, the throttle is dirty or stuck: after the air conditioning works, the compressor may also work, and the compressor is driven by the engine, so the load of the engine will increase after the air conditioning is turned on, which means that the engine needs to increase the throttle opening to increase the air intake. When the throttle valve has carbon deposit or is stuck, it will cause the engine to shake and produce abnormal noise. This will be more obvious after the air conditioner is turned on. 2. Abnormal sound of air-conditioning pump: There are generally two reasons for abnormal sound of air-conditioning pump: the abnormal sound of electromagnetic clutch and bearing in air-conditioning pump is mainly due to the wear of electromagnetic clutch, which affects the increase of clearance, and the abnormal sound of bearing in air-conditioning pump is mainly due to insufficient lubricating oil. If it is not solved immediately, it will affect the combustion of air conditioning pump and hinder the refrigeration work. 3, the compressor drive belt is not tight: the drive belt is too loose and the electromagnetic clutch is easy to slip; Too tight drive belt will increase the load of electromagnetic clutch. The drive belt is not tight enough, which will cause abnormal sound and damage the air conditioner compressor.