There is a small warm air tank in the cab. When the hot and cold knob on the left side of the panel hits the red area (heating), the water-saving valve leading to the small water tank is opened for the flat panel, and the cooling water of the engine circulates through the small water tank to dissipate heat, and then the fan or external ventilation air flows through the surface of the small water tank and is sent out from the air outlet. Therefore, there is no extra consumption of fuel consumption and power of the engine! The cooling liquid circulates in a small way, so when the water thermometer reaches the middle, you will feel the heating temperature coming up. European cars have excellent heating effect and will be cared for by your car in winter!
Therefore, when the cold car starts, it is best not to turn on the warm air immediately, and then turn it on after the engine idle speed drops. Generally, warm air should be turned on after a certain distance, otherwise the engine will run at low temperature for too long, which is not good for the engine.