Try turning the AC to Off. Maybe it's the pulley as it loads. Even the belt and other pulleys may be suspect? I also have a noise but it's more a whine than a squeal. Haven't had a chance to dig into it but the more I listen to it the more I'm convinced it's a hose sucking air and it goes into high pitch on high revs.
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2012 Panamera 4
2010 Boxster
2000 Boxster S 3.2L
1990 Land Rover Defender 6x6
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