Info by steve;
"...Vent Window Disassembly
The vent window frame is very easy to remove from the door once the door panel is off. Roll the glass all the way down, and remove the 2 phillips screws from the upper front edge of the door frame. Remove the 11mm (7/16") bolt from the inner door skin, just rearward of the divider bar and about 6" down from the glass. (Do not remove the 8mm - 5/16" bolt if present.) Pull the rubber glass run down from where the divider meets the top of the door frame & rearward out of the back of the divider. Tilt the vent window frame rearward to remove it from the channel in the door's upper forward edge, and rotate the front of the vent window frame inward 90 degrees. Tilt the frame back and slide it up & out of the door. Reverse to install.
With the frame out, unlatch & open the vent window, remove the two 5.5mm (7/32") screws from the upper pivot, and remove the 11mm (7/16") crimped nut from the lower pivot bolt. Slide the spring & indexed washer off, and rotate the upper pivot away from the frame. Gently rap the frame & vent window pivot bolt on a solid surface to drive the bolt & window up out of the frame. Catch the nylon washer & limit cam as the bolt clears the frame.
Work the ends of the rubber seal out of their notches in the frame, and peel it out of the channel. On '92-96, remove the 4 staples from the front corner, and remove the shield..."
http://www.supermotors.net/registry/media/687495
see his site for pics as well
&
Vent Repair in an 86; "...Just two philips on the top of the door, pull the inner trim panel and remove the 7/16" bolt and she's comes out on you hand. Watch the up and down window's seal if it's older as you could tear it pulling it out of you corner window's track..."
Source: by Sixlitre