300SD Will Not Shut Off - Page 2 - PeachParts Mercedes-Benz Forum

Brian77 · #1 01-06-2010, 03:18 PM

Well, in trying to address the airflow issues I reexamined my work last night by again taking apart the dashboard. I had made the mistake of not replacing the penny clips that hold the bowden cables in place for the center vent sliders and thought that it would be o.k. Well, I was certainly wrong, as the sliders worked horribly and cut off airlow to the center vents. Of course, the only way to reattach the clips was to take off the dash cover. At least the job was easier the second time around, taking only about 6 hours to complete.

So, now I have heat to the side and top vents, but the floor and door heat is weak. At least the car now shuts off, which is what started this ordeal. I know that the vacuum pods are brand new, so I will try to locate the source elsewhere.

toomany MBZ · #2 01-04-2010, 11:07 AM

Quote:

Originally Posted by Brian77

In my opinion the climate control system is the most overengineered piece of garbage that Mercedes engineers ever devised, only matched by their clear arrogance by the placement of these garbage components that none of them would ever need to be changed. Here, here!

The job was a mixed success. The car now shuts off immediately, and I now have heat coming from the floor (did not use to have heat from this source); however, it appears now that I have to troubleshoot why, with the rush of the blower motor, the rush of warm air is flowing from the defrost vent and faintly from the floor with nothing from the side vents. So, it appears that I will now have to go back into the dashboard and diagnose this gremlin. As I understand, it could be anything from jammed flaps to a monovalve to a cracked CCU unit.

The 126's have a weak link on the drivers side floor vent flap. Mine was broken and the fan pushed it closed. I rigged the flap (door) open, doing so without having to go too far, just remove the lower kick panel.
I also have other issues that I'm afraid I'll have to dig into it as far as you did.
Did you take any pics of your repar?

Brian Carlton · #3 01-04-2010, 11:58 PM

Quote:

Originally Posted by toomany MBZ

The 126's have a weak link on the drivers side floor vent flap. Mine was broken and the fan pushed it closed.

Agreed.

I'm curious if anybody has repaired this issue properly. Both the SD and SDL suffer from it and my feet are freezing. I'd like to fix it properly, once and for all............but, I'll bet the entire console must be removed.

toomany MBZ · #4 01-05-2010, 10:43 AM

On mine I believe it was a failed wrist pin type thing, as I recall thee isn't an arm dangling on the door itself, so, yeah, I'd have to dig pretty far into it.

rsmartin · #5 01-05-2010, 10:47 AM

not a permanent fix, but i used a coat hanger with a loop bent on the end so it wouldn't be a sharp end, and pushed it in through the knee panel opening at the door so the coat hanger pushed the door open enough to allow the warm air to come out.

very poor sentence structure but i hope it makes sense. certainly made those long drives from Maryland to Tennessee in the winter much more comfortable with having warm feet AND a warm door by the way.

toomany MBZ · #6 01-06-2010, 04:38 PM

Oh well, thanks for posting the pics.