The thermostat in a cooling system
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Correct answer to question 27 (Auto & Shop Information): controls coolant flow to hold the engine at operating temperature
Method
The thermostat stays shut when the engine is cold so it warms up quickly, then opens to let coolant reach the radiator. A thermostat stuck shut causes overheating; one stuck open leaves the engine running too cool. Pressurising is the radiator cap's job.
Updated: November 2026
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