Do you need to turn on AC when using the heater?

1 Answers
GabrielleMarie
07/29/25 10:53am
You don't need to turn on AC when using the heater. The AC button controls the compressor switch, while the heater mainly utilizes the internal heat circulation of the car to maintain cabin temperature. During this process, the compressor doesn't work - you only need to adjust the airflow. Turning on AC would waste fuel. To use the heater, first start the engine for preheating. When the engine temperature gauge reaches the middle position, turn on the heating system while setting air circulation to external mode to expel cold air from the cabin. After 2-3 minutes, switch to internal circulation. Sleeping in a car with heater on is extremely dangerous. For prolonged heater use, slightly crack open a window to maintain warmth while preventing carbon monoxide poisoning.
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