I got the same A/C Cooling problem when I bought my Cuore. A very qualified A/C technician suggested me to change the compressor and replace it with Terios Kid compressor. I got this job done in Rs. 7000/- (2nd hand Compressor + Labour + Full AC Service), job done in 2012.
Still, I am very happy with the cooling as its really chilling even in hot sunny weather. Lots of ppl admired the cooling quality.