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Orifice translates to, "opening" and is a modifying word. For example: nasal orifice is a nostril. I don't know the context you are using this term for but an orifice tube refers to a tube's opening. If oil, maybe the one that the dip stick goes in; transmission same thing, intake- the carburetor or filter passages. Hope this helps.
Its a liquid line an start from condenser to evaporator. Following the small line you will find connection before the evaporator and the pipe have marks about 3 in.from the connection. Evacuate the freon and disconnect the pipe. You will need special tool to remove the office tube or nidell nose plier. Twist and pull till the orfice tube is out. If the tube brake insert long wood screw and pull . Worst case ask your auto parts store for repair kit. Is 5in. Replacement set. Cut the pipe and install the new one. Very carefully follow the direction of the new orfice tube. Vacuum the system and recharge.
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.
A/C Evaporator Core Orifice Replacement Kit Installation
Discharge A/C refrigerant system. Refer to System Discharging and Recovery as outlined.
Remove condenser to evaporator tube (19835) from vehicle.
Locate A/C evaporator core orifice (19D990) by three indentations or a circular recess in metal portion of the condenser to evaporator tube.
A/C Evaporator Core Orifice Location
Note angular position of ends of condenser to evaporator tube so that it can be reassembled in correct position.
Cut a 63.5 mm (2.5 inch) section from condenser to evaporator tube at A/C evaporator core orifice location. Do not cut closer than 25.4 mm (1 inch) from start of a bend in tube.
A/C Evaporator Core Orifice Section Removed From the Liquid Line
Remove contaminants from the two pieces of the condenser to evaporator tube.
NOTE: The inlet half of the condenser to evaporator tube will be positioned against the A/C evaporator core orifice tabs when correctly assembled.
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.