Hi, mines a 12v 1993 auto without aircon, i thought the same as you as we were about to do the Draa valley last year, i contemplated has it retro fitted but if you speak to more and more people regarding air con in Africa they may say more people are ill as a result of using it? , your body is going from one extreme to the other constantly, if its any good to you we managed fine without it and never missed it, its just what you get used to really, even at 44 deg in the desert! one thing i will advise though is get your windows tinted, it make hell of a difference and keeps the sun at bay, it has a two fold advantage, people can't see in the back and its great at reflecting the sun.