I'm replacing the factory air-conditioning in Clifford (1988 XLT) Truck still had a non functional original R12 system, appeared to be unconverted, no evidence of R134. The belt for the compressor was missing when I bought the truck. Otherwise the system was intact. There was a tiny bit of pressure in the system. I'm replacing all components with new. Using a Sanden 709 compressor in place of the original. FS6. Brackets for the Sanden are fabbed and ready to go. Also using a 1994 parallel flow condenser. Question, is the orifice attached to the original condenser outlet? There is a brass fitting 3"-4" long between the condenser and the hose to the evaporator with what looks like a brass orifice inside I have new evaporator and receiver/ dryer to install. haven't pulled the evaporator and dryer yet. I've previously done conversions on 2 Mazda pickups with the 90 deg/capillary type expansion valve that worked fine. I have a good vacuum pump and 134 ac service gauges.