Ok quick update. I did quite a bit of testing on the vacuum system. I found that there is a leak in the ACC system. I guess when I did my original testing I did not think to change the controls on the ACC with the engine running. Anyway here is what I found.

Numbered according to the picture.

I tested by pulling the rubber adapter off the electrical switches and checking to see if each one would hold vacuum.

1. Bad - also missing from the top of the sticker on the picture, color= red/white
2. Bad - Red/Yellow hose.
3. Good ??? takes a few pumps and then holds.
4. Good - same issue as 3 - Green hose
5. Bad - didn't hold vacuum without dropping above 15 inch Hg
6. Good - Green and Blue

Does anyone have a clue as to where these hoses go and what would be wrong exactly. Should I be worried about the slow buildup lines or is that a side effect of the another part of the system with a leak.

I figure with my luck that the dash will need to be removed. My car slowly changes vents from the defroster to the cabin vents. I found an 83 300D diagram for an ACC2? diagram, but the colors dont match what I believe I saw. Anyone else have a diagram for an '83 300SD?

Thanks.

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