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How To Judge The State Of FAW TRUCK THERMOSTAT
- Nov 22, 2018 -

When the engine starts to run, the main valve of the thermostat can not be closed if there is cooling water flowing out from the inlet pipe of the water tank's upper water chamber; when the temperature of the engine's cooling water exceeds 70 C, there is no cooling water flowing out from the inlet pipe of the water tank's upper water chamber, it means that the main valve of the thermostat can not be opened normally, and then it needs to enter. Do the repairs. The thermostat inspection can be carried out on the vehicle. The following methods are used.

Inspection after engine starting: Open the radiator nozzle cover, if the cooling level in the radiator is still, it indicates that the thermostat is working normally, otherwise, it means that the thermostat is not working properly. This is because when the water temperature is lower than 70 C, the expansion cylinder of the thermostat is in a contraction state and the main valve closes; when the water temperature is higher than 80 C, the expansion cylinder expands, the main valve gradually opens, and the circulating water in the radiator begins to flow. When the water thermometer indicates below 70 C, if there is water flow in the intake pipe of the radiator and the water temperature and heat, it means that the main valve of the thermostat is not closed tightly, which makes the cooling water circulate too early and large.

Inspection after water temperature rise: At the initial stage of engine operation, water temperature rises rapidly; when the water thermometer indicates 80, the heating rate slows down, indicating that the thermostat works normally. Conversely, if the water temperature has been rising rapidly, when the internal pressure reaches a certain level, the sudden overflow of boiling water indicates that the main valve is stuck and suddenly opened.

When the water thermometer indicates 70-80 C, open the radiator cover and radiator drain switch, and feel the water temperature with your hands. If both hands are hot, the thermostat works normally. If the water temperature at the radiator feeding nozzle is low, and there is no water flow or little water flow at the intake pipe of the radiator upper chamber, the main valve of the thermostat can not be opened.

The thermostat with stuck or closed closes should be removed and cleaned or repaired.