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The heater valve should default to open. So if you have vacuum there when the heat is on then it is most likely the check valve for the heat system, the big one that is, or it is the CC Unit itself. Unplugging the vacuum line at the heater valve should open it up and allow it to flow. Of course then you will have a vacuum leak so plug the line after.
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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.....
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