Quote:
Originally posted by ChevyHighPerformance:
I hear the same noise only for the first minute or so. It seems that the PCM is programmed to engaged the fan even though the engine is cold perhaps to place a laod on the engine to help it heat up and get into closed loop.
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Cooling fan is totally mechanical, PCM has no control. It is controlled by a mechanical fan clutch.
Maybe it is the clutch? Evidently, something is heating up, and expanding.