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Vacuum hose is off under hood, bilevel not working on 1997 Oldsmobile Regency

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A/C and heater both blow fine upper and lower but neither will blow thru bi-level. I checked under the hood under the black plastic box by the firewll. There was a split tube with one small vacuum line disconnected. Not sure where it connects to though. It appears to have been taken out of the bundle of tubes in the split plastic tube but not sure why. Any help is appreciated. Thanks Very Much
(1) Answer
First thing is to put something in the line ( pencil ) and plug it to see if the trans shifting problem is because of the vacuum leak. Then try to find a diagram of the vacuum lines, maybe http://images.google.com/images?q=1997+oldsmobile+regency+vacuum+diagram&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=AsBLS6TvJ4TkswOZ1cj1Dw&sa=X&oi=image_result_group&ct=title&resnum=1&ved=0CBwQsAQwAA