I had to fix the blend door and recirculation door on my wife's Grand Cherokee. I bought the blend door from rolandgendron on ebay, it was a work of art, much better than the factory plastic junk. You end up cutting into the duct to put it in, it's a lot easier than pulling the dash. That was definitely money well spent.
The recirculation door kit was just two bent wire 'tools' and an instruction sheet. You were supposed to pull the broken door up with the pieces of wire, put in two self-tapping screws, and bend a piece of wire around the screw heads to hold the door in the outside position. I tried doing it his way, but ended up reaching in and breaking the door in half so I could get out, and RTV'ing a piece of kydex over thie inside door so it has to pull air from the outside. The recirculation button doesn't do anything, but it beats pulling the dash.
