Reciprocation Engine Induction And Cooling Systems Oral Practice Test

What occurs if the thermostat sticks closed?

Sticking closed leads to rapid overheating It makes the engine heat up slowly It reduces fuel consumption It improves radiator efficiency

Correct Answer:

Sticking closed leads to rapid overheating

Explanation:

The thermostat controls when coolant is allowed to flow to the radiator, opening to shed heat once the engine reaches operating temperature. If it sticks closed, coolant can’t circulate through the radiator, so the engine can’t lose heat effectively and temperature climbs rapidly, causing overheating. The other statements don’t fit because they describe effects you wouldn’t see when cooling is blocked—there’s no slower heating, no drop in fuel use, and no boost to radiator efficiency.

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