japanese a/c uses rotary compressor,, where as if yr looking for better cooling,, use pistontype compressor,, its stronger in cooling but takes more power from engine.
japanese coil box is normally white in color and pakistan assembled uses black color coilbox.
i am using pistontype a/c as engine doesnt have problems with it even going uphill and jdm (japanesecoilbox with new vaporator and twin switchcontrol and temp adjust. so a/c can be adjusted accordingly as desired..
car is corolla 1996.
New piston compressor cost about 9k.. coilbox cost varies where you get it from ,,etc.
i went to Boss a/c shop on waltonroad for a/c work