if you are talking on top. or is on top the vents that face you? I had a similar prob in my 90 where an actuaror behind the dash went- one that opens up the little doors so the air can be switched to different regions.... break. my air was only blowing out the front defog vents- nowhere else. I suppose u are ok if its blowing the air at ur face...91+ has a better autp climate control system.
-Josh
"Not everything that can be counted counts, and not everything that counts can be counted. " - Albert Einstein