89 300TE the a/c is blowing out of the side vents and the defrost. I have lost the center vents. I know it is a vacuum module, I don't know which one, location or ease of repair, any help would be greatly appreciated. Also if it is a buried module can I prop a stick in the center stack to hold the door open just like the 560's????

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'05 Ford Escape 100,000 miles
'87 560SL 92000 miles
'89 300TE 199,000 miles
'02 Audi TT 100,000 miles
'00 Ford Excursion V-10 121000 miles
'92 Mercury Capri 100000 miles
'02 BMW 325XI 60000 miles
'92 230CE 160000
'87 BMW 535SI 160,000 miles
'93 Rinker Captiva 209
5 Kids
2 Dogs
1 Wife