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Old 03-12-2001, 09:35 AM
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Join Date: Apr 1999
Location: macon,ga. usa
Posts: 352
93 300E 2.8, rear headrests stuck in the up position. They run on vacuum, right? Car has no other vacuum symptoms at all. BTW, this car has a power rear shade, if that complicates things any. Thanks to anyone for your help, allen.
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Old 03-12-2001, 10:45 AM
n2lw's Avatar
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Join Date: Jun 1999
Location: Smith Mt Lake Va
Posts: 119

There are a few posts in the archives on how to fix this. It is a broken toothed belt that can be fixed with a strong cable tie.
Do a search under headest and you should find all you need
OOPs, sorry I was thinking of the front headrests, still you might find an answer there with the modifier rear
92 500e, 85k, silver/gray,all stock.
96 Club Wagon,Hypertech chipped( College Hauler)
97 320 SL 50k
1980 BMW e21 323 Baur conv.
1990 300GE 99k
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Old 03-12-2001, 02:11 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
I recall posting an answer to this problem some minutes ago...

The rear headrests are partial electrical and partial vacuum controlled. The switch on the dash is connected with an electrical valve that allows the engines vacuum system to tear down the rear headrests. When you push the button, the valve is opened and the vacuum pods under the rear deck will take care of throwing down the head rests.
* Do the headrests fall down when you push the button a little longer? (this will indicate a vacuum leak in the system).
* Is there a blown fuse?
* Do you hear a (minor) clicking sound at the rear deck when you push the button? (you can hardly hear it when it does function properly).
Since both head rests don't fall down, I presume you have a problem with the electrical valve or vacuum hose from engine to electrical valve.

...just some thoughts...

The picture above shows the electrical valve on the rear deck of a C class (in front of the speaker). It is connected to one incoming vacuum hose and two outgoing vacuum hoses. Forget about the speakers in the picture...

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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