What does it mean when the A/C button light is on in the car?

[LaDawson]

The A/C button light on in the car indicates that the air conditioning compressor is turned on, while the light being off means only the car's fan is blowing air. Principle of heating: The heating comes from the heat generated by the engine during operation. When the engine's cooling system dissipates heat from the engine, the fan directs this heat into the car, creating warm air. When the heating is not in use, the fan stops, and the heating vents close, allowing the dissipated heat to completely escape into the atmosphere. Therefore, car heating is a form of waste heat recycling and does not consume fuel. Pressing the AC button activates cooling: The AC button is the switch for the air conditioning compressor. In summer, when using the air conditioner, you must press the AC button to turn on the cold air. On the other hand, heating only utilizes the internal heat cycle of the car and does not require the air conditioning compressor to be activated. Thus, to turn on the heating, you only need to adjust the air conditioning button without pressing the AC switch.