How to Determine if the Cruze Thermostat is Good or Bad?

1 Answers
DelEmery
07/29/25 6:19pm
The methods to determine if the Cruze thermostat is functioning properly are as follows: 1. Coolant temperature exceeds 110 degrees: Park the car, turn off the engine, and open the engine compartment cover. If there is a significant temperature difference between the upper and lower hoses, it indicates a thermostat failure. 2. The engine does not reach normal operating temperature for a long time: Park the car and let the engine temperature drop to match the ambient temperature. Restart the engine and drive. When the dashboard temperature reaches around 70 degrees, park the car, turn off the engine, and open the engine compartment cover. If there is no temperature difference between the upper and lower radiator hoses, it indicates a thermostat failure. 3. Use an infrared thermometer to target the thermostat housing and measure the temperature changes at the thermostat's inlet and outlet to determine if the thermostat is opening. When the engine starts, the inlet temperature will rise, indicating the thermostat is closed. When the temperature gauge reaches 70 degrees, measure the outlet temperature. If it suddenly increases and the temperature gauge shows above 80 degrees, 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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