I had the AC overhauled in my 2000 by HABTOOR shj because it was leaking water into the footwell and not cooling so well... they charged 200dhs for the job.. within a couple of months the same things happened...
I took it to a workshop which was recommended in shj and they removed the unit inside the dashboard and cleaned out a load of sand/dust and s**t.. since then it has been working ok.
I don't think the Pajero AC is as good as my wife's corolla, so i don't expect too much...
cheers
CD