Well I have the visa/versa issue. It was open and should have been closed. I was watching the flap when I disconnected/reconnected while I had the glovebox out....by the way I don't think that I get any air through the vents when climate control is off.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k