What does the A/C light indicate?

[EvaRose]

The illuminated A/C button light in a car indicates that the air conditioning compressor is activated, while an unlit light means only the car's fan is blowing air. Here is relevant information: 1. Warm air comes from the heat generated by the engine during operation: When the engine's cooling system dissipates heat from the engine, the dissipated heat is directed into the car through the fan, creating warm air. When the warm air is not in use, the fan stops, and the warm air vent closes, allowing all the dissipated heat to be released into the atmosphere. Therefore, the car's warm air system recycles waste heat and does not consume additional fuel. 2. The AC button: The AC button controls the air conditioning compressor. In summer, when using the air conditioner, the AC button must be turned on to activate the cold air function. However, warm air only utilizes the car's internal heat circulation and does not require the air conditioning compressor to be activated. Thus, to use warm air, you only need to adjust the air conditioning settings without turning on the AC switch.