when the car is driving, that is, to continuously flush fresh air into the car interior, driving out dust, carbon dioxide, and harmful gases from the engine. In the cold winter, fresh air should also be heated to ensure a suitable indoor temperature.

2. Heating system: Its function is to heat the air inside the car or fresh air entering the car from the outside, achieving the purpose of heating and dehumidification.

3. Refrigeration system: Its function is to lower the temperature inside the car when the outside environment temperature is high, making passengers feel cool and comfortable.

4. Air purification system: Its function is to filter the incoming air, continuously eliminate the polluted gases inside the car, and keep the air inside the car clean.

5. Control system: The control system mainly consists of electrical components, vacuum pipelines, and control mechanisms. On the one hand, its function is to control the temperature and pressure of the refrigeration and heating systems, and on the other hand, to manipulate the temperature, air volume, and flow direction of the indoor air to improve the various functions of the air conditioning system.

Car air conditioning is generally composed of a compressor, an electronic clutch, a condenser, an evaporator, an expansion valve, a receiver dryer, pipes, a condenser fan, a vacuum solenoid valve, an idler, and a control system. Automotive air conditioning is divided into high-pressure pipelines and low-pressure pipelines. The high-pressure side includes the compressor output side, high-pressure pipeline, condenser, storage dryer, and liquid pipeline; The low-pressure side includes the evaporator, accumulator, return air pipeline, compressor input side, and compressor oil tank.

Liquid storage dryer - actually a device that stores refrigerant and absorbs refrigerant moisture and impurities. On the one hand, it is equivalent to the fuel tank of a car, replenishing the excess space for refrigerant leakage. On the other hand, it filters out impurities mixed in the refrigerant like an air filter. The storage dryer also contains a certain amount of silicone material, which plays a role in absorbing moisture.

Condenser and evaporator - although they have different names, their structures are similar. They are all devices that are covered with metal sheets for heat dissipation on a row of curved pipes, in order to achieve heat exchange between the outside air and the substances inside the pipes. The condensation of a condenser refers to the heat dissipation of the refrigerant in its pipeline from a gaseous state to a liquid state. Its principle is similar to that of the engine's radiator (the only difference is that the water in the radiator is always in liquid form), so it is often installed on the front of the car, enjoying the cool breeze from the front together with the radiator. In short, wherever the condenser is cooled, it goes to facilitate its heat dissipation and condensation. The evaporator is exactly the opposite of the condenser, it is the place where the refrigerant changes from liquid to gas (i.e. evaporates) and absorbs heat.