[W126 Coupe] dick, markus, jonathan

[Dick Spellman]

Hi Gary,

You need to test each vacuum pod (using no more than 10 inches vac 
pressure) by disconnecting each of the vacuum lines at the switching 
valve and applying MightyVac and pumping to 10 inches.  If the pressure 
holds, the pod is good; if the pressure is not at all or quickly drops, 
the pod has failed.

There is a 2 vac line loop to the air dam door (fresh air-recirculation 
flap) up behind passenger glove box.  This requires you identify both 
vac lines before running the test.  One is taped off the other you apply 
MightyVac.

In any case, I suspect your pod diaphragms have developed holes/cracks 
and need to be either replaced or rebuilt.

By far the least expensive route is to order the repair kits from George 
Murphy (maybe $50-60) for a set needed for all the pods.  Or you can buy 
new pods from Jonathan or MB for what used to be ($70-85) each.

You need two for the recirc/fresh air door - replacing these will make a 
HUGE difference in the cooling capability of the car! located up behind 
glove box or pass airbag.
one for center/windscreen pod located to just above and the right of 
center console and vacuum switching valve
one for leg flap (the age of your vehicle will determine if this is the 
square pod or the updated round one) located on the face of the heater 
box dead center behind radio
one for air dam located to drivers side of center console

That's it.  If you choose to do kit repair, post a note so a few tricks 
on 'how-to' can be shared so you don't break the plastic clips and you 
don't create holes in the new dual diaphragm rubber seals.

Regards,
Dick

Gary wrote:

> my a/c is working like it use to...meaning more a/c air flows out the 

> dash windshield vents than the center vents?   is that a vacuum pod 

> thing.  can i just replace the dash windshield pod and all will be ok? 

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