The thermostat is often turned on or turned on too early, which makes the cooling system carry out a large cycle too early, 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.
The impeller of the water pump is damaged or lost, so that the flow through the warm air small water tank is not enough and the heat cannot come up. There is air resistance in the engine cooling system, which leads to poor circulation of the cooling system, high water temperature and not hot warm air. If there is air in the cooling system all the time, it is likely that the cylinder pad is damaged and air leaks into the cooling system.
Extended data:
Precautions:
1. At the initial stage of engine operation, the temperature of coolant rises rapidly; When the coolant thermometer indicates 80℃, the temperature rises slowly, indicating that the thermostat works normally.
2. When the coolant thermometer indicates 70-80℃, turn on the radiator cover and radiator waterproof switch, and feel the coolant temperature by hand. If it is hot, the thermostat works normally; If the coolant temperature at the radiator inlet is low and there is no or little coolant flowing out of the radiator inlet, it means that the thermostat main valve cannot be opened.
3. If the coolant in the radiator is calm, the thermostat is working normally; Otherwise, it indicates that the thermostat is not working properly. When the temperature indicated by the coolant thermometer is lower than 70℃, if there is coolant flowing at the radiator inlet pipe and the coolant is warm, it means that the main valve of the thermostat is not closed tightly, which makes the coolant circulate prematurely.
Baidu Encyclopedia-Chang 'an Ruihang M80
Baidu encyclopedia-thermostat