Should the AC be turned on when using car heater in winter?

[BrooklynLee]

In winter, there is no need to turn on the AC when using the car heater. Here is an introduction to the AC function: 1. The reason for not turning on the AC when using the heater is that the working principle of the car heating system is different from that of the cooling system. The car heater uses the heat emitted from the exhaust pipe and radiator to warm the air, which is then blown into the cabin by the fan, without the need to activate the compressor. 2. Using the heater does not significantly affect the car's fuel consumption. However, improper use, such as turning it on too early, can lower the engine temperature. If the system detects a drop in engine temperature, it will increase fuel injection to raise the engine temperature, which can lead to increased fuel consumption.