What does AC mean on a car?

[PaulFitz]

The meaning of AC in a car: 1. The AC button in the car is the air conditioning cooling switch. 2. When you need to turn on the air conditioning for cooling, press the AC button, adjust the temperature selection knob to the blue section, and then turn on the fan switch. When the button indicator lights up, the car's air conditioning compressor starts working, and cold air blows out from the vents. 3. When you need warm air, adjust the temperature selection switch to the red section and turn on the fan switch to get warm air. There is no need to press the AC button again. Car air conditioning heating is not related to the compressor; the heat is provided by the car's radiator, and then the blower blows the heat into the car. There is basically no energy consumption, so there is no need to press the AC button.