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The door that directs the air flow IS vacuum controlled, but I don't understand why it would change all of the sudden. Has this happened before or the first time? Did any warning lights on the dash show up (ie the brake warning light for low vacuum?) If it's happening all the time, could be the switch that controls/directs the vacuum to the correct line.
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1990 E-350 Club Wagon, 7.3L IDI, E4OD, 3.54LS 
1983 F-150 2x4, 4.9L, C-6 w/GV-OD, 3.55 Farm pickup
1981 C-8000, 3208 CAT, RT-6510, Rockwell SSHD Tandems (Swap)
1977 K100C, NTC-350, RT-1110, Tandem
1977 Transtar II, NTC-290, RT-9509 Single
1977 Transtar II, Formula 290, RT0-9513, Tandem
1974 C-750, 391CID, Clark 5 speed, Eaton 2 speed
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Linear Mode
