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Originally Posted by slickwilly
the WD40 on the belts has helped...
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WD-40 applied to the belts will cause them to slip a lot. This may be quiet, but they may eventually disintegrate from a chemical reaction...
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Originally Posted by slickwilly
...There may be a bearing going out...
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Yes, a bearing can squeal and make other noises under the hood.
WD-40, or any other lube, may quiet the bearing for a while, but the noise usually comes back.
Or, the bearing might fail without making any further noise, except one final screech over the pulley that is no longer turning before it disintegrates...
Remove the belt(s) and try turning everything by hand, see what's binding.