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84 300D a/c vents not working

My 1984 300 turbo d (new to me) blows cold air out of the wind shield defrost. Nothing out of the center vents and yes the're turned on. Is this a vacuum issue or a servo issue? In either case where do I look for vauum leak? I had the under the dash panel off and there are 2 (that I can see) pretty pink plastic things. Would those be the servos?
Any advise would be helpful
Thanks
wil

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1985 300D Turbo, CA mod. w/ trap oxidizer: vacuum line connection

After doing some engine work, I could not get the engine to shut off. I checked all the vacuum lines and connections, which were ok, including testing the fuel shutoff valve and checking the line to it for grease (none). From previous testing, I know that the vacuum pump works well. I thoroughly studied the "Vacuum System Troubleshooting" manual. I noticed that there is one black vacuum line which remains unconnected, the one with a damper from the vacuum transducer which supposedly goes to the automatic transmission vacuum modulator. When I plug this line with my finger, the engine stops.

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'83 300SD Missing switch above domelight?

I've been working on getting my '83 300SD back to fighting fit and I'm beginning to move on to cosmetic issues now. One thing that has been driving me nuts is a hole in the headliner, not a cigarette burn, but one that was made into it. It's about an inch square and has has molded, rounded edges. It's about an inch above or aft of the domelight. My SD has a sunroof, but the switch for that is in the cluster above the climate controls. Can anyone tell me what this hole is for?

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