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Old 09-29-2007, 07:51 PM
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Posts: 545
300sd vacuum lines - disconnected line under dash

1983 300sd

While upside down under the dash to change the cruise control amp, I noticed an apparently disconnected vacuum line under the driver's side of the dash.

The line in question is a thin black line that comes through the firewall pretty much to the left of the cruise control amp. It comes through a grommet that also contains three much thicker vacuum lines - a red/green, a blue/brown and a brown. I cannot find anything that the thin line should have been connected to (i.e. the other end....)

I've also found a vacuum diagram on this forum that talks about a cabin vent line that is also black, that is connected to the vacuum control valve.

Have I found my cabin vent or have I found a line that should be connected to something else?

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Old 09-29-2007, 08:06 PM
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Location: Lancaster, PA
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sounds like the vent line - but do you have any vac. related problems? Doors, fuel cap, trunk, etc?
1981 240d - 135k - Arlene

Last edited by Jordan G; 09-29-2007 at 09:04 PM.
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Old 09-29-2007, 08:21 PM
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Originally Posted by Jordan G View Post
sounds like the vent line - but do you have any vac. related problems? Doors, fuel cap, truck, etc?
Nothing like that. Everything seems to work OK. I have some climate problems from time to time but those lines are much thicker than this one.

The upshift from 1 to 2 gear is a little abrupt but I do not think that is connected to this line in the cabin.....
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Old 09-29-2007, 09:30 PM
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Location: Sacramento, Calif.
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It's just a vent line. I freaked too while scoping my 300SD years ago. Shop CD confirmed "vent line". Your good to go.


Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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