The car air conditioning system mainly consists of a refrigeration system, a heating system, a ventilation system, a control system, and an air purification system, involving multiple key components to ensure the comfort and health of the air inside the car. The following are the main accessories of car air conditioning systems: Compressor: It is the core of a refrigeration system, responsible for compressing the refrigerant and transforming it from a gaseous state to a liquid state. Condenser: responsible for heat dissipation, helping to cool and condense high-temperature and high-pressure gaseous refrigerants into liquid. Evaporator: Absorbs the heat of the surrounding air through a low-temperature and low-pressure liquid refrigerant, reducing the temperature. Expansion valve: regulates and controls the liquid refrigeration dosage entering the evaporator to prevent compressor liquid shock. Storage dryer: stores refrigerant and filters out impurities and moisture. Pipelines, condensing fans, vacuum solenoid valves, idlers, etc. are also important components of refrigeration systems.