An engine that takes unusually long to reach normal operating temperature, and runs cooler than normal, often has
Pick an answer
Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 155 (Auto & Shop Information): a thermostat stuck open
Method
If the thermostat never closes, coolant keeps flowing to the radiator even when the engine is cold, so the engine loses heat continuously and struggles to warm up.
Updated: November 2026
Raise your AFQT scoreFree for iPhone and Android
