The orifice tube should be located in the liquid line that goes along the passenger fender. The easiest way to find it is with your ac working, run your hand along that line and on one side of it it will be hot and the other side cold.
Where Is The Orifice Tube On A 2003 Dodge Ram 1500 4x4 With A 5.7L Engine?
Orifice tube?????? Someone winding you up, orifice is an opening to enter the body,mouth, anus, vagina etc.