Sooner or later, it LEAKS!! may be this season it performs well, but it will give you the problem/issue in next year!
Change is the only solution as per my research on the informationn available on internet and visits of AC service centres in Lahore. Whenever i tell them that its Altis, they node their head to say NO, u have to change it!!
I remember my 95 civic has the same issues and my AC guys fixed it without replacing the compressor!! and the same guy refused to do it for my Altis!! =/
I guess after 5 years of continuous service, if they need some money on maintainance, it shouldnt b an issue!! Please consider the environment factor and how rough we use the car air conditioner!! u mite have witnessed many cars standing idle with AC on infront of road side restuarants / burger corners!! these factors matter ALOT in my opinion!!