Ok, I looked everyware and I found no answer to this. Here is the solution:
On the Dash of the versa to remove the Ac/Vent controls panel. you need to pop the panel benth it first. use Flat Scrow driver. Jam it to the right of the panel benth the AC about 3 milemeter from the top of that panel and pop the Clip. do the same from the left side. then the whole panel will open like a door and comes out. remove the Cycle Air Handel. Remove the two scrows that holding the AC Panel from the Bottom(They where hidden under the panel u just removed). Use the flat Scorw driver again and insert it from the bottom Right going up Right under the AC panel all the way and try to pop the clip on the top right. Do the same from the left side. Disconnect the AC panel from the Stero panel. Now you half way there. now u will need to remove all 3 air nopes. then pope the two clips on the top and two on the bottom to remove the front end of the air unit.
you almot Done. Not by far, It gets diffcult now. remove the 4 scrows holding the control unit. push it In, Yes "In", and twist the right side out and unplug two sockets from the bottom and 3 michanical wires White, green and black on the top (Good luck with this step.). Now you can get two button from a broken VCR and replace the old two AC and Defrost buttons.
When you read this Pray for me!!