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ASE T1 Truck Gas Engine PrepQuestion 7 / 10

A cooling fan on a medium-duty truck runs constantly, even when the engine is cold. Technician A says a faulty fan clutch could cause this condition. Technician B says a stuck-closed thermostat could cause this condition. Who is right?

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✓ Correct answer: B. A only A faulty fan clutch that fails to disengage will cause the fan to run constantly regardless of engine temperature. A stuck-closed thermostat would cause overheating but wouldn't directly affect fan operation when the engine is cold.

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