[Richard]

My 94 runs 134a. Stock compressor lasted 26 years and over 150,000 miles, owned the truck since new. Changed everything but the condensor and evaporator at the first compressor swap and coils and hard lines were flushed because of mechanical failure. First rebuilt compressor never saw refrigerant as it was leaking when I pressurized system with dry nitrogen. Second rebuilt compressor clutch gave out in short time. System was still clean and holding pressure when I changed to the OEM Delco compressor so I saw no need to replace orifice, accumulator and hoses again. Two years seems like a short time for an OEM part.