You do know that the center vents are cold air only right? The outers and all others are for the warm side. So if you are doing these tests with center only open then that is why it is cold. Now the question is, if you are getting warm air when on defrost mode? Mine is acting funny as well, no matter how I set the knob I get cooler air, unless I select max heat or just under that on the dial. I am thinking mine is a bad temp sensor somewhere.

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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.....