Resurrecting an old but very useful thread. With the help of this thread I have jury rigged my vent system to start working again. Have had an issue where I only have flow from the side vents, and some through the defroster. I presumed my center valve pod was probably shot. Key bit of info in the thread was that this is the default if no vacuum is coming to the vacuum valve manifold behind the airbag/glovebox.

So I pulled the airbag and dug out the trusty Mitey-Vac. Pulled off the top feed to the valve manifold and sure enough, no vacuum when the engine was running. Pulled a vacuum on the manifold with the Mitey-Vac and voila, suddenly I had full air out the center vents - Yes!! And the line to the center vent held a vacuum nicely when pulled down directly with the M-V.

The main vac line to the valve manifold was green. Fed from a Y located above-behind the master cylinder. Checked for vacuum there, no joy. Tested vacuum from the pump, beaucoup vacuum there. So it seems that there is some break in that line, which I could not trace. (did not try from underneath because lazy...) So I elected to put a spare Y fitting in the line just after the T tap line above the pump, and ran a new vacuum line to the Y behind the master cylinder, and voila, vents working normally. Next oil change when I'm underneath, I'll try to trace that non working vac line.

Rgds,
Chris W.
'95 E3000D, 447K

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