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  #1  
Old 01-14-2006, 01:39 AM
dunl's Avatar
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servo problem

Last weekend I removed my servo and performed a bypass to get some heat in the cabin of my 1980 300SD. I had a vaccuum leak somewhere that kept the engine from stopping, so I re-attached the servo in the hopes that would fix it (didn't, so I'm now looking for leaks and vacuum line locally).

When I put the servo back in, it wouldn't turn on any of the air controls in the cabin. Push a button and it is like it's still taken out.

Any ideas where to start?

Thanks,
Dunl
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  #2  
Old 01-14-2006, 12:29 PM
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Quote:
Originally Posted by dunl
Last weekend I removed my servo and performed a bypass to get some heat in the cabin of my 1980 300SD. I had a vaccuum leak somewhere that kept the engine from stopping, so I re-attached the servo in the hopes that would fix it (didn't, so I'm now looking for leaks and vacuum line locally).

When I put the servo back in, it wouldn't turn on any of the air controls in the cabin. Push a button and it is like it's still taken out.

Any ideas where to start?

Thanks,
Dunl
new servo (and always a new servo amp at the same time) or the performance products digital replacement....

it controls all of your climate control pods.......it don't work nothing else will work either.....sorry, you want it to work right thats the only option you have....you did notice the mass of vacuum lines that plug into the top.....thats why.
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  #3  
Old 01-14-2006, 12:41 PM
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I believe the reason its not working even though it is plugged back in is the vacuum leak. I suspect that once you trace down the vacuum leak, you'll get back some control from the servo.
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  #4  
Old 01-14-2006, 12:57 PM
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Seems more electrical, though. I have a bypass switch to control the blower, and when I pressed any of the other controls, I used to have air blowing, but not heat. Now when I press them, the blower turns completely off?

Weird.
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  #5  
Old 01-14-2006, 01:27 PM
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I believe the electrical and vacuum controls are correlated in the servo.
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1984 300SD 315k--daughter's car
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  #6  
Old 01-14-2006, 01:54 PM
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Okay, thanks.

Now, just need to find some vacuum line locally.
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  #7  
Old 01-14-2006, 02:55 PM
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Quote:
Originally Posted by kerry edwards
I believe the electrical and vacuum controls are correlated in the servo.
They are. I have the impossible to find Factory Climate control manual for the W116 chassis (hardcopy version).....its not the W123 but his and mine both used the Evil Vacuum servo.
__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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  #8  
Old 01-24-2006, 09:54 PM
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Manuel

I have a copy. anything in particular?
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  #9  
Old 01-24-2006, 10:07 PM
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Yes that servo set-up is very evil indeed. To bad Mercedes could not see the wisdom in using the manual system like on the 240d.
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