Thanks. I think it is the check valve. My flaps open when I accelerate, which I think is the default when there is no vacuum as I recall from when I had it apart. All my right angle connectors are good on my switct over now. I replaced the bad ones. So I guess the next thing will be the check valve! Can you just get them at the local parts store or are they special to MB?

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....