Should the car AC switch be turned on in winter?

[LilaLynn]

The car AC switch does not need to be turned on when using the air conditioning in winter, but it should be turned on when using the cold air in summer. Turning on the AC switch will consume a certain amount of fuel. Here are the relevant details: 1. Car air conditioning cooling actually uses a compressor to compress the refrigerant into a high-temperature, high-pressure gas, which is then cooled and delivered into the car via the blower. After turning on the air conditioning compressor, the engine load increases, and the car's fuel consumption also rises. 2. The role of the AC switch: (1) When using the heater, the air conditioning compressor is not required. The blower simply blows some of the engine's heat into the car, and no additional fuel is consumed. If the AC button is pressed while using the air conditioning in winter, although it won't affect the heating function, it will prolong the time it takes for the engine coolant to warm up and increase the car's fuel consumption. (2) If fog appears on the car windows when using the heater in winter, the AC switch must be turned on to defog the windows quickly.