There are many tiny cooling pipes inside the heater box, which are as easy to block as the radiator of the water tank. After the warm air tank is blocked, the cooling liquid flowing through it is slow and the heat is insufficient, which leads to the phenomenon that the warm air of the air conditioner is not hot and needs to be cleaned in time.
2. The cooling system is short of coolant:
Automobile warm air is a parallel pipeline in the small circulation pipeline of engine coolant. It is connected with the warm air tank, and only when the blower blows the warm air tank will warm air be generated. If there is no coolant, it will also lead to the phenomenon that the warm air is not hot, which is also a common warm air fault in the process of daily car use.
3, thermostat failure:
The main reason why the thermostat is not hot is that the thermostat cannot be closed. After the thermostat is always open, the coolant will circulate from the idle speed of the engine. When the ambient temperature is low, even if the water temperature is not hot, warm air will not be hot.