1997 3800 Series II Grand Prix AC Pulley Noise
The triangular shaped thing is the compressor drive for the a/c compressor, what you're experiencing is the lack of air gap on the compressor clutch assembly. You have to use an a/c puller tool to open the air gap on the compressor so that it fully releases when it is shut off, not a huge deal, but it sounds really bad when the clutch is dragging and it makes those nice metal filings.
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