What is the reason why the water temperature in the van is sometimes high and sometimes normal

Insufficient cooling medium.

Antifreeze: High-end cars are required to be filled with antifreeze all year round;

Water or distilled water: temporary substitute;

The water tank cover is leaking.

The thermostat is damaged.

If you want to remove the thermostat, you should plug the small circulation at this time, so as to ensure that all the coolant is dissipated by the water tank;

When installing a new thermostat, you should pay attention to the water hole, such as Santana does not have a water hole, at this time, a 6mm drill bit should be used to drill a hole. One function is to be used as a marker; 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.

The water tank is clogged. External blockages should be removed with water or gas;

Internal blockages affect coolant circulation and create pressure, which can result in two outcomes, one is a leaking water tank or the other is a particularly high water temperature at high speeds.

Pump failure. The impeller slips or gets stuck, causing the timing belt to break;

The impeller is deformed. Cylinder corrosion.

The combustion chamber and the waterway are flushed, and at this time, the water will be drained from the drain pipe or white smoke will be discharged, resulting in a frequent shortage of water in the water tank;

The waterway and the oil channel are flushed (the oil is white when there is water);

The waterway and the waterway are rushed, resulting in poor heat dissipation of the cylinder block, especially at high speed;

Blocked waterways. incorrect ignition timing (corrected with timing lamps) and excessive oil pressure;

Maybe the water tank has air in, just drain the air, or the thermostat is broken, the thermostat has a lifespan, depending on how long you have changed, the thermostat is about 30 yuan. Then check the circulation box of the water tank, whether there is a leak.

1. Lack of antifreeze and thermostat damage, insufficient antifreeze can not meet the engine heat dissipation, if the thermostat is damaged, the antifreeze will always work in a small circulation, the antifreeze does not pass through the heat dissipation tank, these two reasons will make the engine temperature overheated.

2. The water potato digging temperature sensor is faulty, the cooling system cannot judge the water temperature of the engine, and the cooling system is not cooled, resulting in the engine temperature being too high.

3. The cooling fan is not working normally, the cause of the failure is the problem of the cooling fan control circuit or the failure of the fan motor, or it may be that the belt of the fan is broken, resulting in the inability to dissipate the heat normally and the water temperature of the engine is high.

4. The outer surface of the water tank or condenser is blocked, which may be blocked by dirt, resulting in the ventilation rate being too low to dissipate heat normally, and it needs to be cleaned.

5. The cooling water pipe is blocked or leaking, and the cooling water cannot pass due to the blockage of the water pipe, and the water temperature will be high, and the cooling water will be insufficient if the water leaks.

6. The temperature control valve in Liangzhong is blocked, and the valve is not opened normally when the water temperature reaches a certain temperature, and the cooling water cannot be circulated normally, resulting in high water temperature.

The following are the reasons for the high water temperature of the blind limbs of the van: 1. The temperature saving valve is blocked: because when the water temperature reaches a certain level, the valve cannot be used normally, and the cooled water cannot be circulated normally, so the water temperature is high.

2. Damage to the fan for heat dissipation: It may be due to the failure of the fan motor, the belt of the fan is broken, or the temperature is too high due to the problem of the control circuit. 3. Failure of water temperature sensor:

The water temperature system cannot sense the temperature normally, and the cooling system does not carry out cold and stuffy spring, which leads to the phenomenon that the water temperature is too high. 4. There is a blockage on the outer surface of the water tank: it is possible that there is something dirty that is blocked, which causes the vent to be unable to dissipate heat normally, and needs to be cleaned to dissipate heat normally.