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To diagnose a noisy pulley, remove the serpentine belt and turn all pulley's by hand. Try to notice which of the pulleys make a grinding sound or feels loose. Even an alternator bearing can sound like just another bad pulley bearing, so don't assume that the alternator is okay.
A bad bearing often feels like there are little grains of sand inside when you turn it manually, but sometimes it's difficult to detect the problem if you haven't had the experience.
Note, before you remove the serpentine belt, make certain that you have some kind of drawing or a good mental image of the routing so that you can put it back.
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