Thanks, your right the orfice tube is located in the refrigerant line that delivers the liquid
refrigerant to the evaporator. However, after researching the AC system in the Mitchell Auto Repair Manual at the local library, I found out that the orifice tube is not right at the outlet of the refrigerant line into the evaporator.
The original (as off the Ford assembly line) orfice tube, is actually crimped into the middle of the liquid refrigerant line as it runs from the condensor to the evaporator. Thats why I could not find it.
To replace the orifice tube one has to purchase and replace the entire condensor to evaporator section of liquid refigerant line. Or there is also a retro fit kit that includes a solid (not rubber) fitting with compression nuts on each end. The kit calls for cutting out the original orfice tube and replacing the section of refrigerant line with the after market fitting designed to hold the replacement orfice tube.
The cost difference is about $10 american so I opted for the entire section of refrigerant line. Why cut the old line and make two additional points for leakage?
Riding cool now!