Yeah, left side looking in from the front, it's the line that runs from your condenser (behind the radiator) into the evaporator, just below the circle spring connector (which you need a special tool to disconnect). The orifice tube will come out with regular needle nose pliers, and it'll be red or blue.
1990 F150 Custom 5.0L 2wd Auto 31x10.5x15 BFG ATs (sold)
2009 F150 STX
HD tail lights