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What Causes a Thermostat to Fail to Open?

1 Answers

DeJudah

07/28/25 6:04pm

A thermostat failing to open is mainly due to: damage to the Wuling Hongguang thermostat. Below is an introduction to some aspects of the thermostat: The working principle of a thermostat is that when the coolant temperature is below the specified value, the refined wax inside the thermostat's temperature-sensitive body remains solid. The thermostat valve, under the action of a spring, closes the passage between the engine and the radiator. The coolant returns to the engine via the water pump, initiating a small internal circulation within the engine. Extended content: Below are the diagnostic methods for thermostat faults: 1. Coolant temperature exceeds 110 degrees: Stop the car, turn off the engine, and open the engine hood. Touch the upper coolant hose in the radiator; it should be very hot. Then touch the lower coolant hose; it should also be very hot. If there is a significant temperature difference between the upper and lower hoses, it confirms a thermostat fault. 2. If the engine takes a very long time to reach normal operating temperature: Stop the car and let the engine temperature drop to match the ambient temperature. Restart the engine and drive until the dashboard temperature reaches around 70 degrees (do not exceed 80 degrees). Stop the car, turn off the engine, and open the hood. Touch the upper and lower coolant hoses in the radiator. If there is no temperature difference, it confirms a thermostat fault. 3. Using an infrared thermometer to test the thermostat: Aim the infrared thermometer at the thermostat housing to measure the temperature changes at the inlet and outlet. This can determine whether the thermostat is opening. When the engine starts, the inlet temperature will rise, indicating the thermostat is closed. When the coolant temperature gauge reaches 70 degrees, test the outlet temperature. If it suddenly increases and the gauge shows above 80 degrees, the thermostat is opening and functioning normally. If there is no temperature change, the thermostat is malfunctioning and needs replacement.

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