1. Water tank scale The water temperature in the water tank is always maintained at a high temperature, which will combine the hydrocarbon radicals in the water with calcium and magnesium plasma to form water-insoluble calcium carbonate and magnesium carbonate, commonly known as water alkali. Then as the water continues to evaporate and concentrate, the alkali content of the water continues to increase and reaches saturation, forming scale.
2. Engine coolant The engine coolant takes away the heat generated by the engine, and at the same time supplies the heat to the interior of the car through the heater water tank to form warm air. If the engine coolant is lost, it will cause problems with the heater. First of all, we can Check to see if cooling is missing.
3. The engine temperature is too low. When the engine temperature is too low, the warm air in the car is not hot enough. It can speed up the vehicle, make the engine run faster, and increase engine temperature.
4. The thermostat is always open or the thermostat is opened too early, which causes the cooling system to perform a large cycle prematurely, and the outside temperature is very low. Especially when the car is running, the cold wind quickly cools the antifreeze and the engine water temperature does not rise. Come on, the warm air won't make you hot.
5. Lack of antifreeze. Especially in some cars, the heater air will be hot when the gas pedal is opened, and the heater will not be hot when the gas pedal is not opened. The first thing to consider is the lack of antifreeze. It is a very simple problem. .