How do I test amp draw on the aux pump? How do I take black plastic cover off CCU? I get all the little clips off, but the the top part (where you get at the buttons) doesn't want to come off. I don't want to break it.

For all you that know about the CC of MBZ's, does the fact that I can no longer get the air distribution to change from the default (defrost) position indicate a problem with the CC panel or a vacuum connection? (Air will only come out of defrost and two vents in front (no centers for a/c) I would really appreciate the help--this is the only thing wrong with the CC, and would really like (need) to get this fixed for as cheap as possible.

Thanks

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro