Explaining the symptoms of a stuck-closed car thermostat

Diagnosing a stuck closed thermostat involves examining the cooling system. Mechanics typically start by checking temperature variations in the radiator hoses, indicating potential blockages like a closed thermostat. They perform pressure tests, inspect coolant levels, and even test the thermostat in hot water to verify its functionality.

Preventing a stuck thermostat involves regular cooling system maintenance: flushing and replacing coolant, inspecting for leaks or blockages, and adhering to manufacturer-recommended thermostat replacement intervals.

A closed thermostat poses a serious risk to the engine, necessitating swift action. Recognizing symptoms early, understanding the risks of neglect, and maintaining the vehicle properly can prevent issues. If suspecting a closed thermostat, prompt inspection and service by a qualified mechanic are key.