Do You Need to Turn on the AC Switch When Using Car Heater?

[IvanMarie]

You do not need to turn on the AC switch when using the car heater. Introduction: The heating system in a car does not require the compressor to work for heating. Instead, it directly uses the hot air from the engine's cooling system as the heater. Therefore, there is no need to turn on the AC switch when using the heater in winter. However, when using the heater in winter, you should not keep the windows closed for too long, as the engine produces a large amount of harmful gases, such as carbon monoxide, which can cause poisoning or even death. Thus, it is important to remember to ventilate the car when using the heater in winter. Other Functions of the Car Air Conditioning System: The car air conditioning system also has other functions such as internal circulation, external circulation, and air supply mode, which should be used according to different situations. For example, when the air quality outside the car is good, you can use the external circulation mode to refresh the air inside the car, and vice versa. Additionally, if the windshield becomes foggy, you should turn on the defogging function to restore clear driving visibility. Different situations require different modes.