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GM
I would be interested in knowing what you find.
Mine is definetely not due to partially open vents or clogged cabin filter.
It's a little different then your situation in that the squeak is not dependent on throttle. In fact it is heard best during idle when there are no other driving related noises. The squeak is very soft, intermittant, and almost appears to be a slow moving belt squeal/squeak and not really a whistle noise. Only when AC is on and not in EC mode.
Perhaps it is a low refrigerant charge, or vacuum leak as previously posted , which I can get checked next time I'm in for service.
Thanks
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