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im cam, a licenced diagnostic tech
this sounds like you might have a bad ac compressor.
when it first engages, it takes the engine a little more effort to first engage it, so it raises the rpm up and the belt can squeel.
see if you can unplug the ac compressor or disconnect the ac compressor relay and see if it continues.
if it stops, than the compressor is the culprit
how did you make out with your repair?
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