Got 92 300D back from indie after gas-in-tank fiasco. Somehow the vacuum system got disturbed, but I don't notice any disconnected lines. The symptoms are a mild transmission bump under certain circumstances and the rear headrests won't go down. Does anyone know which vacuum line goes to the rear headrests? I figure that if I can identify it I should be able to figure it out. Thanks.

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06 E320 CDI "Benson", Platinum Blue, 170k mi, DD
91 300D "Otis", Smoke Silver, 123k mi, other DD
98 E300 "Murray", Silver, 123k mi, Stage 2 Rocketchip chip tuned, son's DD

Twelve other MB's owned and sold
2002 Honda Odyssey 230k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife

if you look behind the brake booster you will see a few vacuum lines, the white one is for the headrests and leads to the vacuum valve under the rear seat that directs vacuum to the pods that pull the headrest locks which makes them fall.

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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

D'oh! After inspecting and replacing hoses on the DRIVER side, I noticed a disconnected hose over on the PASSENGER side. Further proof that passenger side vacuum is evil and must be eliminated!

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06 E320 CDI "Benson", Platinum Blue, 170k mi, DD
91 300D "Otis", Smoke Silver, 123k mi, other DD
98 E300 "Murray", Silver, 123k mi, Stage 2 Rocketchip chip tuned, son's DD

Twelve other MB's owned and sold
2002 Honda Odyssey 230k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife

That is one hose I don't have on my 300TD, no headrest dropper on a wagon...

I did the evil right side hose delete on mine.

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2014 ML350 Bluetec (wife's DD)
2008 E320 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
1998 E300DT (Younger son's college DD)
1987 300TD (selling)
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gone but living on
1983 240D (body to greazzer, engine to t walgamuth)