AC changes 0n '90 200

[nick at beol.net]

Vehicle is '90 200 tqa.   Often, in hot weather when the AC is on auto and  
cold air is blowing out of the dash vents, something changes. The fan  
still is blowing, the ac clutch is still clutching, but the air no longer  
comes out the dash vents.  Very likely a door is changing positions.  Can  
happen at idle or at speed. To get the air back out of the center vents  
turn off the ignition and back on.  Turning off/on the climate control  
won't bring it back.
Has anybody seen this and figured out what to fix?
Any suspect that the servos simply leak off?

TIA
Nick

-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/