'83 300D vacuum locking weird behavior

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adobyte@gmail.com - 12 Apr 2005 10:32 GMT

My '83 300D turbo is behaving strangely due to some vacuum leak
that I cannot pinpoint... The locking system behaves as follows:

- With the A/C and heater off, engine takes a while to shutdown,
and afterwards every door needs to be manually locked (seems there
is no vacuum in the system at all)

- Pressing any of the climate control buttons (except OFF) while
the engine is running seems to close the vacuum leak, as the
engine can be stopped immediately and locking the driver's door
from outside automatically locks the other 3.
However, vacuum stored seems to be minimal since further unlocking
and locking of the driver's door leaves passenger side front and
back doors unlocked.

- With the climate control button on and the engine running,
the driver side doorlock can be pressed and the other 3 will
be automatically locked as well. Then, if I try to stop the engine
with the doors locked it will take a long time, and when it
finally stops the 4 doorlocks are unlocked automatically and they
need to be locked manually (locking the driver side door from
outside does not propagate to other doors at this point).

>From this description of the problem, can anybody suggest where

the vacuum leak might be?

Thanks!

Rogelio

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Roland Franzius - 12 Apr 2005 16:16 GMT

adobyte@gmail.com schrieb:

> My '83 300D turbo is behaving strangely due to some vacuum leak
> that I cannot pinpoint... The locking system behaves as follows:
[quoted text clipped - 21 lines]
>>From this description of the problem, can anybody suggest where
> the vacuum leak might be?

Press your ear tigth at each door. Its probably one of the rubber
gaskets of one of the doors push/pull cylinders. Since vacuum locking
mechanism its still working a while you may hear the leak piping. And
dont forget to replace the vacuum valve between intake manifold and
brake assistant vacuum reservoir first.

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Roland Franzius

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wffarms@bellsouth.net - 13 Apr 2005 15:22 GMT

300D as in diesel. Does it shift OK? Some times the vac line will get pulled
off by a stick or grass going to the trans.
Start at the vacum pump, work your way back (pray its not under the dash) I
would bet on a bad diaphram.
TIP: If you can't get to the place you want to be but have acess to the line
going there you can clamp the line w/ hemostats or vice grips (thick paper
or leather will keep it from biting a hole in the line) If you have a vac
gauge, put it on the main line, clamp the sub-lines till you see the vac
increase.
good luck, lyndo

> adobyte@gmail.com schrieb:
> > My '83 300D turbo is behaving strangely due to some vacuum leak
[quoted text clipped - 32 lines]
>
> Roland Franzius

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