OK, both the high and low service ports are in the passenger rear of the engine compartment. I have included a picture of the line assembly below, but it needs a little explanation:
#3 is the line from the firewall (evaporator) to the orifice tube #1 (connection in the middle).
#2 is the line from the orifice tube to the condenser. The fitting on #2 is the HIGH side and the fitting on #3 is the LOW side.
Was the vehicle running?