, is an important part of the car,

, is an important part of the car, through the refrigeration, heating, defrost, air purification and humidity regulation provides the comfortable environment for the car, having the effect that cannot ignore the car's comfort, the car engine or motor driver, but as a result of automobile air conditioning working conditions, no maintenance for a long time, most of the working condition is, while the vehicle is under intense and frequent shock and vibration are constrained by the power system and whole vehicle electrical system, etc, thus easy to produce all kinds of fault, the fault diagnosis of automobile air conditioning is home air conditioning is difficult also. This paper will analyze the main components of the operation of the automobile air conditioning system, the refrigeration principle of the air conditioning system, and the problems and faults that can occur in the main process of the operation of the automobile air conditioning system, and put forward the corresponding fault diagnosis and maintenance methods.