What is the temperature of the warm air?

It is more appropriate to turn on warm air when the water temperature is 80-90 degrees. Because the source of warm air is engine coolant, if the warm air is turned on too early, the temperature of coolant will rise slowly and the preheating time will increase. Before the engine enters the working temperature, due to the poor atomization effect of the mixed gas, the fuel injection will increase and carbon deposition will easily occur. When the warm air is turned on, the coolant in the warm air tank will also enter the engine block, resulting in a longer engine heating time. When the air conditioner is turned on, the air outlet direction is downward, or switch to the direction of adding the front windshield air outlet at the foot of the bottom. Don't blow directly in the direction of face and body, because the hot air flows upward, the direction of the air outlet will warm up faster, blowing in the face will be dry, and there will be some engine odor.