PeachParts Mercedes-Benz Forum - View Single Post

Jeremy5848 · #7 02-03-2008, 11:57 AM

1. It may be possible to disassemble and repair the auxiliary pump -- others have done it, as posted here. OTOH, you can simply remove it and substitute a piece of pipe. The aux pump helps primarily at low engine speeds, city traffic, etc. The old farts (like me) who buy Mercedes complained that there wasn't enough heat -- that's why the pump was installed. You can do without it.

2. The lack of heat to the floor vent most likely means a bad pod, as was just said. They are rebuildable and replaceable -- rebuilding is less expensive, of course. You remove it, replace the broken diaphragm, put it back in place. Search the forum for instructions. Temporarily (permanently?), you can remove the link from the pod to the floor vents and wedge them open -- I had to do that on a winter trip last year. I posted pictures here somewhere.

3. Bilevel sends heat to the windshield, the left and right vents, and the floor ducts. Center vents are for a/c only (although that can be changed).

4. The temp control wheel failure to work probably means that something is fried in the ACC pushbutton unit or the servo. I have never heard of anyone rebuilding their own servo. Rebuilt units are expensive and modern redesigned servos also. You could add a mechanical valve controlled by a cable from the cabin, I suppose.

Jeremy