Belt squeal or something

The squeal persists-- spray water, the squeaky squeal stops.

New Gates Serpentine belt, new idler pulley, new belt tensioner. All today, my mechanic is out trying to trouble shoot it right now.

Maybe try spraying a specific pulley each time until you determine exactly which one is the culprit before replacing any more parts.
 
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Do you have AC?

Could be water pump, alternator, power steering or AC compressor.

Lots of our crank pulleys have compromised rubber cores and need replacement.

-Mac