Jim, I have no direct experience with the later Klima system (Klima II), but it's an in-house, Mercedes-built replacement of the original Chrysler-designed system. In general, vacuum leaks are rare within the system itself, but external leaks will cause the climate-control system to behave strangely. I would first determine just where the vacuum leak is before going further. How quickly and responsive are the door locks? This is usually where vacuum leaks begin.
There is a diaphragm in the servo that can fail, causing many, if not all, of the problems you are describing with your system, especially temperature wierdness. This diaphragm is relatively easy to check and replace, much easier than replacing or bypassing the whole system, or tearing into the dash to search for a (probably) corectly functioning vacuum element. The procedure has been chronicled here in the past by (formerly vwNate, now) omNate and others. Do a search in the archives for "servo repair" or "servo diaphragm".
Mark in Lakewood, CO
----- Original Message -----
From: n61cm <jim@tazwade.com>
To: diesel mercedes <diesel_mercedes@yahoogroups.com>
Sent: Sat, 10 Sep 2011 09:13:32 -0400 (EDT)
Subject: [diesel_mercedes] Floor vent vacuum controller 84 300D
84 300D
I think the vacuum controller for the flap that controls air flowing under the dash into the floorboard area over my feet has crapped out. No matter what button I push on the controller, it never opens up. I was wondering how difficult it is to swap that vacuum element out - is it like the center vent job from hell or is it easier to get to? I think that it must be leaking vac because the car is taking longer to shut off now, it "diesels" for three seconds after key is turned off. Or maybe that is another problem.
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