What is the reason for the high water temperature of freight cars in summer?

A, the reason of the water temperature is too high and detection steps:

1, first check whether the water tank leaks;

2. Check whether there is too much dirt in the water tank.

3. Check whether the fan works normally;

4. Check whether there are traces of water leakage outside the engine;

5. Check whether the water temperature sensor is normal;

6. Check whether the water pump works normally, and whether it is missing or damaged;

7. Check whether the thermostat works normally;

8, water temperature meter failure, display error;

9, related circuit failure, indicating that the water temperature is not the water temperature;

10, the cylinder mattress is damaged;

Second, the water temperature is too high and it is prone to six kinds of faults:

1. When there is traffic jam or idling for a long time, the engine water temperature meter shows too high, the high-gear electronic fan works for too long, and the engine noise increases. The air conditioning fault is the most obvious in hot weather;

2. The air conditioner is turned on in hot weather, the idle speed is unstable, the speed fluctuates too much, the engine is weak when accelerating rapidly, and the engine has abnormal noise;

3. It is not good to start the car again after the hot car is turned off for ten minutes;

4. Sometimes the hot car will automatically turn off when driving;

5. When the car is cold, the air conditioning refrigeration temperature is very cold, and when the car is hot, the air conditioning refrigeration effect is not good, and the air conditioning system has a great * * * vibration buzz;

6. When the hot car is idling, the clutch of the air-conditioning compressor is frequently sucked off or even disconnected, resulting in that the air conditioner of the hot car cannot be cooled.

Third, the usual car precautions:

1, check whether there is too much dust between condenser and water tank. Thoroughly clean the water tank and condenser with high pressure gas to ensure good heat dissipation performance.

2. When the car is hot, the temperature difference between the upper and lower water pipes of the water tank should not be too large. Otherwise, it is necessary to check the opening of the thermostat and whether the speed of the water pump is lost.

3, hot car, check the return pipe backwater at the top of the antifreeze tank. If the backwater is not smooth or blocked, the water temperature will be too high.

4. Replace antifreeze in time. Due to the irregular addition and replacement of antifreeze, the engine water channel and water tank are blocked in advance, resulting in excessive water temperature. Antifreeze should be replaced once every two years, and original fittings must be used when replacing and adding. In addition, it should be noted that the water temperature will be too high after water is added to the engine cooling system, or the concentration of antifreeze added exceeds 60%.

5. Fill an appropriate amount of air conditioning refrigerant. In the air conditioning system, the pressure at the high pressure end is too high, the refrigerant or refrigeration lubricating oil is filled too much, and the self-regulating function of the internal self-regulating air conditioning compressor fails, resulting in the high pressure and the air conditioning condenser is blocked. The above faults will increase the load of the engine and consume the heat dissipation performance of the cooling system, resulting in excessive water temperature. In addition, too little or too much refrigerant will reduce the refrigeration effect.