Well I am going to post something of mine from another forum. My pump does work as you will see in the post, but it is not turning on and off properly. So I have this question for you all to see if anyone here can help me find my problem.

What electronic component powers the Aux Pump? My aux pump works if I manually ground the brown wire on the pump. I Have 12V at the other wire and when I probe the ground wire with a test light I get some power on that line as well. So if I ground that line the pump works fine. When I turn off the CC unit thought the pump is still on. So I am wondering what controls the pump. Does the CC unit supply 12V when needed to turn it on? Does the CC unit Complete the ground for the pump to engage it? Also if the pump is off does the Heater Control Valve close? Currently my Heater Valve never closes and no vacuum is even sent down that line, not even when the CC is set to Off or the AC is engaged! My Aux pump does not turn on either, even though it works, but is leaving an open ground. I checked the Heater control valve and the vacuum element is fine. So what is missing or wrong here, new CC or new Vacuum Unit in dash for CC unit. By vacuum I mean the unit in the dash that splits the vacuum and sends it to the appropriate vacuum elements to open and close all the vents properly. By CC unit I mean the Climate Control Push Button Unit in the dash.

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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.....