Generally speaking, the car is hot, and I have summarized the following points:
1, engine coolant is insufficient;
2, water temperature sensor or water temperature meter failure;
3. Long-term downwind driving or low-speed and heavy-load driving in hot season;
4. The ignition time is too early or too late; ;
5. The blinds cannot be fully opened;
6. The mixture is too thin or too thick;
7. The water tank is dirty outside or has serious internal scaling, resulting in poor heat dissipation, and the water tank needs to be cleaned or replaced;
8. The engagement time of the fan clutch is too late or the cooling fan doesn't work, the rotation resistance of the fan is too great, the blades are installed backwards, and the blades are damaged.
9. The performance of the electric fan is poor or the speed is not high;
10, too much carbon deposit in the combustion chamber;
1 1, the water pump belt is too loose;
12, there is something wrong with three-way catalysis;
13, the punching phenomenon is caused by air and water;
14, the thermostat doesn't open well and needs to be replaced;
15, other water pipes, elbows and water holes of waterway are blocked;
16, the water pump is not working well (circulating water is not enough);
Inspection items 14, 15, 16: open the cover of the water storage tank, remove the water supply pipe, and start the car to see if the water is smooth;
If the engine suddenly overheats during the running of the car, it may be due to the fracture of the fan drive belt, pump shaft and impeller, and the leakage of the cooling system (such as the aging and rupture of water pipes). ), or the thermostat main valve falls off.
That's all. You should check from simple to complex.