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, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 254k 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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2012 BMW X5 (Beef + Granite suspension model)

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, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 254k 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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The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older son’s DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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gone but living on
1983 240D (body to greazzer, engine to t walgamuth)