Meh1.
I also own a cuore 2002, its ACs performance is far better than anyother car of this power, you have had very good suggestions one of which is to insulate your car as much as possible, I also did so, plastic sheet which is laid under the carpets is a really good and cheap way. I insulated my cars' floor it cost me about 300 rs (did it at home) if yours is a newer model say 2009-2010 it came with better insulations. other wise get it insulated.
I also saw a coure insallted with a fan on condensor, talked with its owner he said the results were faboulous, since our cars mostly run in city areas on lower speeds and do not get propper air on radiators and condensors it is a good idea, last year checked with an electrician he asked for Rs 2000 it included a good quality fan plus his fee.