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Okay, let's see if I can do this...
Here's the vacuum page from my '87 EVTM:
You see a single vacuum line controlling outside air, and dashed lines (cables) controlling the flaps in the ductwork.
Here's the electrical page from my EVTM:
The resistor is bypassed in 'High'
I have pic's of my plenum, control panel, etc... but I can't compress the pictures down to below 1.85M and still have enough detail.
I guess the cold left me with a foggy lens.
Thanks for the diagrams. Subford sent me a couple different ones as well I will put thise on the thread also. I think with these I have a good understanding of the system. Subford also confirmed that the little tank on the side of the heater box should be enough vacuum reserve.