Since all the doors are vacuum operated, and you say none of them function (the are called "MODE" doors, BTW. The "BLEND" door controls air temperature), I would guess you have no vacuum going to your mode control knob. Check that first.
1992 XJ 2" lift -- RIP
2000 XJ 3" lift -- Australian Ford Big Brakes up front, rock rails, ZJ rear discs (with WORKING parking brake), C4x4 rear bumper/tire carrier, Hella H4 headlights, IPF driving lights, OEM skid plates, OME springs/shocks, JKS LCA's, JKS Sway Bar links.