last year I had installed the ac system in my petrol driven mehran. it was a chinese system with mitsubishi rotary compressor. the cooling was just average. for this past one year the performance remained constant with no problems. The car never took load, never heated up and fuel economy was also unaffected. but now I feel that the cooling needs improvement. showed it to a couple of technicians and all of them blamed the compressor. they said that the gas level is full but the compressor installed is not a very strong one. I was offered 3 options from compressors:
sanden sd 505 (piston)
denso terios kid (rotary)
duet compressor. (rotary)
please recommend the best of these options.