The problems in the cooling system are:
1, the thermostat is always on or the thermostat is turned on too early, which makes the cooling system carry out a big cycle prematurely, and the outside temperature is very low, especially when the car is driving, the cold air quickly cools the antifreeze, the engine water temperature does not rise, and the warm air does not heat up.
2. The water pump impeller is damaged or lost, so that the flow through the warm air small water tank is not enough, and the heat can't come up.
3. There is air resistance in the engine cooling system, which leads to poor circulation of the cooling system, resulting in high water temperature and lukewarm air. If there is gas in the cooling system all the time, it is likely that the cylinder pad is damaged and the gas leaks into the cooling system; If the inlet pipe of the small heating tank is very hot and the outlet pipe is very cold, this situation should be that the small heating tank is blocked and should be replaced.
Extended data:
Measure the temperature of two water inlet pipes in the small water tank. If both pipes are very hot, there is something wrong with the air flow control mechanism. The reasons leading to the failure of the cooling system are: the thermostat is always on, or the thermostat is turned on too early, which will make the cooling system carry out a large cycle prematurely, and the outside temperature is relatively low, so that the cold air will soon cool the antifreeze, and the engine water temperature will not be heated, and the warm air will not be heated.
The cooling system of the engine is blocked by air, which leads to the problem that the cooling circulation system of the automobile cannot work normally, thus leading to the problem that the warm air is not hot. The water flow in the water tank is reduced due to the damage or loss of the water pump impeller of the vehicle, and the warm air is not hot, so it is necessary to replace the water pump impeller.