84 380SE, 95K miles, its a cherry (a bright red 126!). When in heat mode with temperature wheel at full heat, i get full heat at the windshield. When I turn the wheel from hot to cold there is a point about halfway where it will become 100% air flow from center dash vents (cool air). Doesn't matter if i'm in economy or compressor mode. After searching the threads, I suspect either defrost element behind the radio or CCU (solder joints hopefully) Any consensus on which it is?

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65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)

Did you first try closing the dash vents using the 3 sliders? Generally speaking, even if the pods for the dash flaps are leaking, you will still get a fair amount of volume from the floor vents if the dash vents are closed.

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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

With temperature wheel at hot mode all hot air is coming out of defrost. Only when i turn the wheel to cool does a flap cycle and allow air to come out of center vents. This is cool air coming out of center vents and will do me no good in the floor area when i'm looking for heat.

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65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)

I've mentioned it a couple times. Check the changeover valves located under the panel to the right of the radio. Test each one for electrical continuity. They burn out over time, leaving the heat/cool flaps in their default positions. You should check them first before trouble-shooting the vac elements. Two of mine were burned out, and caused most of my ACC problems (the other culprit being a bad sampler fan).

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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

thanks. Are they individually mounted or are they a one piece unit as in my 560SL. Also, does anyone have a vaccum element schematic for the 84 126, I can't get but halfway in to braingear before it quits responding.

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65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)

They are individual. There are 5 or 6 of them mounted on a metal bracket.

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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

I just went through this last weekend... I had a leaky valve and a bad pod for the leg flap. I also had to resolder my CCM module.