Should You Turn on AC When Using Car Heater in Winter?

[MacArthur]

You don't need to turn on AC when using car heater in winter. The AC button controls the car's air conditioning compressor, which is only required when cooling in summer. Pressing the AC button activates the compressor for cooling. The heater simply utilizes the car's internal heat circulation principle without needing the air conditioning compressor. To use the heater, you only need to adjust the temperature control and turn on the blower fan. Therefore, there's no need to activate the AC switch when using car heater in winter. The heating system uses engine-generated heat to warm the air - after the engine cooling system dissipates heat from the engine, a fan directs this heat into the cabin as warm air. Even if you don't use the heater, the heat generated by engine operation would still be expelled outside the vehicle through normal heat circulation.