maybe I misunderstood you, but if it's the aux fan behind the bumper, then there is no pulley. This is an electric fan. If the loud noise you are describing is a loud roaring noise then it's just the fan on full speed and moving lots of air. If it's a rattling noise (like the old baseball card in the wheel spoke of your bike as a kid) then most likely there's debris in the blade's path. Anything other than that and you probably have a fan motor with a bad bearing (excessive shaft clearance).
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