Please try to give a good amount of detail to your answer.
It's in the high pressure liquid line.
A/C Evaporator Core Orifice
The A/C evaporator core orifice (19D990) should be replaced whenever the A/C compressor (19703) is replaced for lack of performance (internal damage).
The A/C evaporator core orifice, located in the condenser to evaporator tube (19835), cannot be serviced in detail as a component of the line. If replacement is necessary, follow the procedure outlined for Liquid Line Removal and Installation.
An orifice tube replacement service kit may be used as an optional service procedure.
Refer to Section 12-00 for information regarding the use of an A/C Evaporator Core Orifice Replacement Kit E5VY-19D695-A.
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A/C Evaporator Core Orifice Replacement Kit Installation
A/C Evaporator Core Orifice Location 
A/C Evaporator Core Orifice Section Removed From the Liquid Line
Lubricate fitting with clean refrigerant oil and assemble orifice tube kit (with A/C evaporator core orifice installed) to condenser to evaporator tube. Make sure flow direction arrow is pointing toward evaporator end of the condenser to evaporator tube, and taper of each compressor ring is toward compression nut.
A/C Where exactly is the orifice tube located at on a - 4280629.gifCore Orifice Kit Disassembled Components 
SOURCE: Where, exactly, is the orifice tube located on my truck?
the orfice tube is locate in the line between condenser and evaporator. near the spring lock coupling. you must unbolt the cruise servo and overflow bottle, reposition them out of way and you will see the line connection..the orfice is inside line near that uniion. the ac system must be evacuated prior to removal, and recharged afterwards..
SOURCE: orifice tube location on a 1995 gmc jimmy
it is located in the high pressure AC line at the AC evaporator core inlet. The high pressure line is the smaller of the two AC lines that come from the AC compressor on the engine..
SOURCE: Orifice tube 1998 mustang
did you find the location? Let me know one way or another so if I can help anymore ,I will
Testimonial: "Yeah it was actually a lot easier to change than I thought it would be. Now my compressor while recharging it isn't kicking on. Is there a way to get it going again or am I doomed to have to get a new one of those too? lol thanks"
SOURCE: loacation of the orifice tube
The AC evaporator orifice always has to be after the electronic freon release valve after the receiver/dryer, and the evaporator itself.
It is optimal for it to be as close to the evaporator as possible, so sometimes it is even part of the input for the evaporator.
However, it is best if it is separate, because the orifice often gets clogged.
But the most common cause of clogging is ice, so try a vacuum pump to desiccate any moisture out first.
If the clog is ice, you can tell by heating the orifice and melting the ice.
Careful not to get it too hot though.
You don't want to damage hoses, and if freon gets into a flame, it can be toxic.
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