Do you need to press the AC button to turn on the car heater?

[OAdriel]

You do not need to press the AC button to turn on the car heater, as the AC button is the cooling switch for the car air conditioning. The method to turn on the car heater is as follows: 1. Start the engine and let it warm up until the engine temperature gauge reaches the middle; 2. Turn on the heater and set the air circulation to external circulation to expel the cold air from the car; 3. After 2 to 3 minutes, switch the air circulation to internal circulation. The functions of the car heater are: 1. To provide warmth inside the car and increase the interior temperature; 2. To defrost. The working principle of the car heater is: The cold air is blown onto the surface of the heat exchanger, absorbs its heat, and is then directed into the car, thereby raising the interior temperature through the entire system.