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What Causes the Wuling Hongguang Thermostat to Fail to Open?

1 Answers

JoelFitz

07/30/25 3:30am

Wuling Hongguang thermostat fails to open mainly because: the Wuling Hongguang thermostat is damaged. Below is an introduction to some aspects of the thermostat: The working principle of the thermostat is that when the coolant temperature is below the specified value, the refined paraffin in the thermostat's temperature-sensitive body is in a solid state, and the thermostat valve closes the channel between the engine and the radiator under the action of the spring, causing the coolant to return to the engine via the water pump, resulting in a small circulation within the engine. Extended content: Below are the fault diagnoses for the thermostat: 1. Coolant temperature exceeds 110 degrees: Stop the car, turn off the engine, and open the engine compartment cover. Touch the upper water (coolant) pipe in the coolant radiator; it should be very hot. Then touch the lower water (coolant) pipe; it should also be very hot. If there is a significant temperature difference between the upper and lower pipes, it is confirmed as a thermostat fault; 2. If it takes a long time to reach the normal operating temperature: Stop the car and let the engine temperature drop to match the ambient temperature. Then start the engine and drive. When the dashboard temperature rises to about 70 degrees (not exceeding 80 degrees), stop the car, turn off the engine, and open the engine compartment cover. Touch the upper and lower water (coolant) pipes of the radiator. If there is no temperature difference, it is confirmed as a thermostat fault; 3. Use an infrared thermometer to test the thermostat: Aim the infrared thermometer at the thermostat housing to test the temperature changes at the thermostat's inlet and outlet. This can determine whether the thermostat is opening. When the engine starts, the inlet temperature will increase, at which point the thermostat is closed. When the coolant temperature gauge reaches 70 degrees, test the outlet temperature, which should suddenly increase. At this time, observe that the temperature on the coolant temperature gauge should be above 80 degrees, indicating the thermostat is opening and working normally. If there is no temperature change, it indicates the thermostat is malfunctioning and needs replacement.

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