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  #1  
Old 02-05-2008, 05:26 PM
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Join Date: Sep 2004
Location: DFW / Collin County Texas
Posts: 1,882
W126 380SE Vacuum Pods Inop

OK, here's the deal. Originally my defrost was always-on. I removed the defrost flapper pod through the glove box and took it apart - the diaphragm was torn. So I plugged the lines and put the pod away, intending to order it eventually. In the meantime I held it closed with wire, but as you know that can cause some foggy situations when it rains outside.

That was a year ago. Today I finallyl got my brand new replacement pod and installed it, but it doesn't do a thing, almost as if there is no vacuum going to it (I did cycle through the different heating/cooling/recirc [max] functions, etc. to no avail.) Interestingly, my recirc door doesn't seem to work either, and I observed it working a year ago when I removed the defrost pod.

Any ideas where to start? I would just leave it broken, but summer A/C season is coming and when the defrost flap is stuck open the A/C loses half its efficiency. If I wire it shut, I lose defrost function.
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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
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  #2  
Old 02-05-2008, 05:40 PM
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Join Date: Apr 2005
Location: Rockville MD
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Check the vacuum switch-over valves to the right of the radio. Two of them were bad in mine, including the one that controls the defrost flapper.
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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
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  #3  
Old 02-05-2008, 05:52 PM
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Join Date: Sep 2004
Location: DFW / Collin County Texas
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raymr - thanks for the info. Pardon my ignorance, but do I need to pull the radio to get to these valves? What do they look like? Can I get to them through the glove box? Or does the whole dash need to get pulled.
__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
Reply With Quote
  #4  
Old 02-05-2008, 06:52 PM
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Join Date: Apr 2005
Location: Rockville MD
Posts: 833
Just pull the carpeted panel off on the passenger side. I don't think you need to pull the radio. The valves are metal cubes with wires and hoses attached. They are mounted on a metal strip. I just ran a continuity test on each one to weed out the bad ones.
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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma
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