Which component prevents coolant flow through the radiator until the engine reaches operating temperature?

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Multiple choice — select the best answer

AWater pump
BRadiator pressure cap
CCoolant recovery tank
DThermostat

✓ Correct answer: D. Thermostat The thermostat blocks coolant flow to the radiator when the engine is cold and opens to allow flow once operating temperature is reached, helping the engine warm up quickly and maintain proper operating temperature.

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Which component prevents coolant flow through the radiator until the engine reaches operating temperature?

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