Sorry if this questions sucks but....where exactly is the ac system supply vacuum line? Thanks

Can you just get that check valve anywhere like a PepBoys or AutoZone type place or is it special to MB's? I think I need one since when I floor it I sometimes get my dash vents to open, but not always! I just recently put in a new heater core and checked all vacuum connection in the dash and all are good now. I did have one line that was off but it is now reconnected. I have also fixed all bad connectors under the hood and double checked the resvoir. This is on my 190E. So it is strange that I now have this issue that I noticed this morning when I had floor vents selected and the defrost ones opened a few times while accelerating. I am assuming it is the check valve since that is the only thing I have not replaced as of yet. And my Y's are all good! So if I could avoid going all the way to the Stealer for a check valve and could stop at your friendly parts store I would much rather do that! Is there anything special about the check valve or are all pretty much the same?

Thanks,

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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.....