1.2T How does the sound get louder after Corolla turns on the warm air?

It may be that the blades of the exhaust fan in the air conditioner are deformed, which causes the sound to become louder after the warm air is turned on. When the throttle is dirty or stuck, the compressor will also work after the air conditioner works, and the compressor is driven by the engine, so the load of the engine will increase after the air conditioner is turned on, which means that the engine should increase the throttle opening and increase the air intake. When the throttle valve has carbon deposit or is stuck, it will cause engine jitter and abnormal noise. This will be more obvious after the air conditioner is turned on.

cause

There are two main reasons for abnormal sound of air conditioning pump: electromagnetic clutch and bearing in air conditioning pump. The abnormal sound of electromagnetic clutch is mainly caused by the wear of electromagnetic clutch, and the abnormal sound of air conditioning pump bearing is mainly caused by the lack of lubricating oil. If these two problems are not solved in time, the air conditioning pump will be burned out and refrigeration cannot be carried out.

If the drive belt of the compressor is not tight enough, the electromagnetic clutch will slip easily if the drive belt is too loose, and the load of the electromagnetic clutch will increase if the drive belt is too tight. Improper tightness of the drive belt will produce abnormal sound, and excessive belt will damage the air conditioner compressor.