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Message: <blockquote data-quote="Bman5150" data-source="post: 18978" data-attributes="member: 5763">Hello all!So over the weekend Wife is driving her 2019 Equinox with the AC on. Then a whistling noise starts coming from passenger side front floor vent. Gets home, tells me. It only happens when the air is on high with the floor vent blowing, doesn't have to be moving or in gear..Looked under dash where the vent is, wiggling things, checking for something loose or that would be causing this, but nothing.Any ideas on how to elevate this problem? Hight pitched whistle, Very annoying!Thanks,Bman5150</blockquote>