[W126 Coupe] Fw: Re:Vacuum Locking

[Dick Spellman]

Dan,

Check the vacuum line to the IC economy gauge, the headlamp elevation 
switch itself as it does provide a controlled vacuum leak, and the 
vacuum circuit from the euro headlamp elevation switch to each of the 
headlamp feeds.  Then test each feed coming off of the vacuum switching 
valve (remove one at a time and follow the lead to each pod to see each 
pod actuator move and HOLD position under 12-15 hg) to the air control 
flap pods for the automatic climate control.  The main cabin air door 
has two pods each with dual elements and they act in tandem.  So you 
need to test both vac lines at once to achieve door operation.   My 
guess is that you have one or more leaking vacuum pods that regulate air 
flow to the automatic climate control.  It is certainly possible that a 
leak might exist in one of the two lines to the headlamp vacuum 
elements.  Mighty vac each line to determine the whereabouts of one or 
more leaks.

The other main vacuum feeds go to emission components and can be 
isolated in the engine compartment and tested.  There is one line to the 
transmission vacuum modulator.  When this breaks, you get a hard shift 
in all gears.  Other known issues relate to the air slider valve hoses 
and various connections and rubber joints on the intake itself.

The foam on the expansion valve that has disintegrated can be replaced 
using any tight cell foam (like a bedroll cut up from an army/navy 
store) tie wrapped in place.  It's just there to prevent warm moist air 
from coming in contact with that area when icy cold.  The resultant 
condensation will cause a drip and mold etc..

I'd replace the vacuum rubber connectors with more of the same from MB 
if available.

Good luck,

Dick

On 11/22/2011 3:40 AM, L&D gardner wrote:

> Hi Folks

> I have stripped out all the panels under the dash,I found that the 

> yellow vacuum lines from the seats go to the doors from there they 

> come out as blue to the bulkhead ,vacuum will hold at this point and 

> lock the seats,so I must be getting losses elsewhere in the system.I 

> have been watching Kent Bergsma on YouTube finding broken vac lines 

> and discovering 80% of all 126 console gear shifts surrounds are 

> broken,well no surprises there!!

> The 2 foam insulation pads around the A/C expansion valve on my car 

> has perished is there anything better? also Has anyone tried these 4 

> mm push on nylon hose joiners from pneumatic suppliers? would they 

> perform better than the rubber ones, finally does anyone have any 

> experience with "green eye auto parts"prices seem reasonable.

>

>

>

>                                                                Kind 

> Regards

>                                                                             

>                                      Dan Gardner  1986 560  SEC Euro 

> (220kw)

>

>

>

>

>

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