Its the one all the way on the left that moves up and down 
Like a few of the other posts I've read, I'm only getting warm air from the top defrost (round) vents on my '93 RR when I'm driving. I can't follow the advice I've read here because the left-most lever is stuck in the middle position and won't move up or down no matter what. I've pulled the front of the interior vent box off, but that wont let me access the lever (its on the left of this box). Is there anyway I can access the linkage to see why its not moving? Thanks for any clues!
Like a few of the other posts I've read, I'm only getting warm air from the top defrost (round) vents on my '93 RR when I'm driving. I can't follow the advice I've read here because the left-most lever is stuck in the middle position and won't move up or down no matter what. I've pulled the front of the interior vent box off, but that wont let me access the lever (its on the left of this box). Is there anyway I can access the linkage to see why its not moving? Thanks for any clues!