l have a 1996 Infiniti l 30 purchased at an auction...The a/c blows cool (about 69 degrees) but can get cooler...l tried putting in a can of 134 a and the system took it it but not any cooler...l was told maybe the commpressor but the compresor looks and sounds ok....any suggestions????

expansion valve on its way out .if you have manifold gauges check high side pressure . the expansion valve is located near the evaporator core inside vehicle