1, cooling fan does not turn. The cooling fan may be controlled by a temperature control switch; It may also be controlled by water temperature sensors;
2. Insufficient cooling medium. ① Antifreeze: high-gear vehicles require antifreeze to be added all year round; ② Water or distilled water: temporary substitute; ③ Water tank cover leakage;
3. The thermostat is damaged. If you want to remove the thermostat, the small circulation should be blocked at this time, so as to ensure that the coolant is all dissipated by the water tank; ② When installing a new thermostat, it should be noted that there is a water hole, such as Santana, there is no water hole, at this time, the application of 6mm drill a hole. One is for marking; Another function is that during the heating process of the car, the temperature difference between the two sides of the thermostat is generated, so that the thermostat is accurately opened with the water temperature;
4. The water tank is blocked. ① The external blockage should be removed with water or gas; ② The internal blockage will affect the circulation of the coolant, and at the same time will produce pressure, then there will be two results, one is the water tank leakage, the other is the water temperature is particularly high when driving at high speed;
5. The water pump is faulty. ① The timing belt is broken due to the impeller slipping or sticking; ② impeller deformation;
6. Cylinder erosion. When the combustion chamber is flushed with the water channel, it will drain or exhaust white smoke from the drainage pipe, resulting in frequent water shortage of the water tank; ② Water channel and oil channel flushing (oil with water is white); ③ Water channel and water channel impact, resulting in poor heat dissipation of the cylinder, especially at high speed; ④ The water channel is blocked;
7, the ignition timing is not correct (corrected by the timing lamp) and the oil pressure is too high.