No worries Chip ;
There's a _reason_ I have silver hair.... =8-) .
I have scoured the junkyards , used car lots , ' charity ' auctions , thrift stores & used book shops far and wide to bring you my collected ' knowledge ' ~ use it *very* carefully and never expect a fast answer .
There may be two black plastic tubes under the hood , only _one_ under the dashboard and that one is _always_ open because it's a vent so , if it's now connected to the vacuum spider and is sucking air in under the dashboard , I'd unplug it from the rubber underhood spider and plug that vacuum leak for now ~ DO NOT damage nor remove the now apparently useless black vent pipe ! .
-Nate
Chip wrote:
>
> This is very helpful Nate. My black orphan under the hood is connected into the vacuum spider under the hood. I am much less sure how to find "that other vacuum storage" behind my fender or where the black line might plug in.
>
> I have never seen a vacuum diagram under the hood, but will now look much more carefully. It would be wonderful if I find that and begin to understand where all of these lines are to be attached.
>
> Thanks for the help.
>
> Chip
>
> --- In diesel_mercedes@yahoogroups.com, "Nate" <vwnate1@> wrote:
> >
> >
> > The black plastic pipe under the dash , is an open vent pipe , not supposed to be connected to anything .
> >
> > If it is connected to a vacuum source under the hood ,(test by unplugging it under the hood with the engine idling) , then , IMO it's not connected to the right place , it's supposed to be connected to either the HVAC or the tranny vacuum shift valve in the IP IIRC ~ my 300CD isn't here else I'd run out and pop the hood and give it a gander....
> >
> > The vacuum resivoir black plastic pipe , OTOH , doesn't go under the dashboard atall ~ it goes from the underhood rubber 'Y' connector , over behind the brake booster and thence out the inner left fenderwell to the hidden vacuum resivoir .
> >
> > Please be *very* cautious when playing with the vacuum hoses & pipes , alwasy do *ONE* at a time then test drive to see , before making another change or setting the last thing back to how it was .
> >
> > There shoud be a silver sticker on the radiator core support that clearly shows what pipe & hose goes where , life being uncertain occasionally Rolf grabbed the wrong one when your car was assembled ~ my '84 30CD Diesel Sports Coupe for example , has the vacuum diagram for the M-110 GASOLINE engine variant.... (imagine rolleyes emoticon here) .
> >
> > As I received a iPOD Saturday , maybe soon Tom and I will begin taking and posting better explanitory photos for you alls .
> >
> > I hope this waqs helpful Chip , THANK YOU for your vote of confidence ! =8-) (the to the letter bit is important) .
> >
> > -Nate
> > s where ,
> >
> > Chip wrote:
> > >
> > > Without hesitation I follow Nate's advise, to the letter. He last advised that I check the two short rubber tubes that connect the two brown vacuum lines to the key switch. With some struggle, I pulled to access panel to get under the dash and check this connection. I found the rubber connector tubes to be in good shape and the brown shut down lines connected as they should be.
> > >
> > > But...in the process, I would a black vacuum line, all most in the exact location of the brown lines, under my cover panel of the steering column, disconnected.
> > >
> > > I have hunted pretty good under the dash to see when this might have gone, the other end is connected to a three way spider, with a line that feeds the top back of the injector pump and another line that runs to the top of the valve cover and mounts into a black box with other vacuum lines also attached.
> > >
> > > What is the black orphan and what might it need connecting to.
> > >
> > > Nate advised earlier that the black line is some models connected to another vacuum storage container within the driver's side fender, but it appears that this line is running in the wrong direction to make that connection.
> > >
> > > Mine is a 1982 300CD Turbo coupe.
> > >
> > > Chip
> > > Houston
> > >
> >
>
