What is the reason why the hot water tank turns on warm air and blows out cold air?

The causes of cold air blowing warm air in the water tank can be roughly divided into: 1, insufficient antifreeze. The vehicle water circulation system lacks antifreeze, so the water circulation in the warm air box becomes smaller, the heat exchange efficiency decreases, and natural warm air blows cold air. (Common models include the Modern Great Wall, etc. ) Treatment: It is recommended to supplement antifreeze. 2. Vehicles with warm air valves on the warm air pipes, such as Wuling Hong Guang and Beiqi Wangwei. Because the warm air water valve is not opened in the closed state, there is no water circulation in the warm air box, and natural warm air will blow cold air. Treatment: It is recommended to adjust the heater valve from the closed position to the open position. 3, dirt blockage. Because water is often added to vehicles instead of antifreeze, or the antifreeze used is of poor quality, after a period of time, scale will form in the heater box or in the heat exchanger of automatic transmission (such as hatchback automatic machine), resulting in scale formation in the heater box. Treatment: It is recommended to clean the heating box and heat exchanger. 4. The heater operating mechanism is improperly adjusted or damaged. A. When the warm air operating mechanism is not properly adjusted, the temperature control knob is not adjusted to the highest temperature, and the red and blue knobs are not adjusted to the red lower end. B, operating mechanism damage, such as heating and cooling air motor damage, adjusting rope damage, etc. Treatment method: A, aim the knob or button at the warm air area. B, find out the reason and replace the corresponding damaged parts.