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There are idler pulley noises, and there is belt squeak. I started getting a belt squeak a couple years ago but the belt was perfectly serviceable. Looking closely, I noticed some grains of sand had worked their way into the valleys of the belt grooves. The grains lifted the belt away from the little alternator pulley enough for it to slip in spots while under load for a few minutes after starting the engine.
Spent an hour carefully picking out all the tiny grains with the tip of a hard needle (from a drafting compass). Eliminated the squeak and I'm STILL using the original belt.
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