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Sometimes they can get glazed, and no amount of dressing will work for long.
Plus the dressing will make a mess under the hood. And the pulley can become
glazed with a glazed belt. If you decide to replace the belt, I'd hit
with a green scotchbrite pad.
errr... I just saw your sig.... 2000 Vette? It's a ribbed serpentine,
about bad glazing with a ribbed serpentine, and you couldn't get down in
very well with the scotchbrite. Sooooooo guess I didn't help at all,
Your belt is worn out and the belting is riding on the ridges of the pulley. A
new belt will cure it and the dressing is not even a stop gap anymore with the
serpentine belts. When you replace it look at the bottom of the groves and
you'll see the wear on the wire belt.
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