What does AC mean on a car's air conditioning?

[VonNaomi]

AC on a car's air conditioning refers to the cooling switch. Pressing AC turns on the air conditioning. The functions of car air conditioning include: 1. Regulating the temperature, humidity, airflow, and cleanliness of the air inside the car; 2. Filtering the air inside the car, with a sterilizing effect; 3. Clearing fog from the windows. The principle of car air conditioning cooling is: Low-pressure, low-temperature refrigerant vapor in the cooling system is sucked in by the compressor and compressed into high-pressure, high-temperature superheated vapor, which is then discharged to the condenser. At the same time, the external fan draws in outside air that flows through the condenser, carrying away the heat released by the refrigerant, causing the high-pressure, high-temperature refrigerant vapor to condense into a high-pressure liquid. The high-pressure liquid then passes through a throttle to reduce pressure and temperature before flowing into the evaporator, where it evaporates at the corresponding pressure, absorbing surrounding heat. Simultaneously, the internal fan circulates air inside the car through the evaporator's fins for heat exchange, and the cooled air is then directed back into the car.