Air conditioning compressor is not always running

For the fixed displacement compressor, the compressor is not always working when the air conditioner is turned on, but works for a while and stops for a while. Because if the compressor keeps working, there will be liquid refrigerant continuously vaporizing and absorbing heat in the evaporator, and there is a lot of condensed water on the surface of the evaporator. When the temperature is close to zero, the condensed water will frost and the evaporator will be completely blocked., The air conditioner will not blow out.

Therefore, there is a temperature sensor on the evaporator of the air conditioner. When the temperature of the evaporator is close to the frosting temperature, the clutch of the compressor will be disconnected. This phenomenon is most obvious when the air conditioner is turned on in place. Standing outside the car, you can clearly hear the sound of the compressor electromagnetic clutch constantly closing and disconnecting.

Sometimes I suddenly feel the body moving forward while driving, which is basically because the compressor is disconnected. After more than ten seconds, the car body suddenly seemed to be pulled, and the compressor was turned on again.