I have a 2002 Olds Bravda (Chevy Trailblazer). When the engine is running, the engine fan makes a very loud 'whirring' noise that is very noticeable inside the car. I have checked the belt and bolts and anything else I can think of. I have run the engine with the hood up and listened carefully and it appears to be coming from the fan. It would almost seem that the fan blades are not well-designed to operate silently except that this only started a week ago. Before that, the fan did not make a noticeable sound. I do not see any bent, distorted or broken blades - everything looks normal. What else to check?
The fan clutch is stuck not allowing the fan to free wheel like its designed at an idle Replace the fan clutch
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Bearings need replacement in the fan clutch
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It is an engine-mounted fan with what appear to be nylon blades that are all attached to a circular band or rim on the outer perimeter of the fan.
OK - That makes sense. I noticed that the fan is hard to turn by hand when the engine is not running.
Thanks - Two responses with essentially the same diagnosis. You guys are darned good.
Is this an electric fan or engine mounted fan???
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