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The low side A/C service port is located in the low side line nearest to A/C compressor. Due to the design of low side hose, it is difficult to see. When looking down to locate the port, the low side rubber A/C line obstructs the view to the port. I would recommend removing top engine cover and driver side front plastic cover (That Covers ECU And Relays) to easily view the port and it will make it easier to access it if you need to charge the A/C system. Hope this helps you out.
The service gauge port valves are located on the right-hand side at the rear of the engine bay against the firwall.Special couplings are necessary for both the high side and low side service gauge ports.
The low pressure valve on the 02 expedition is located on the accumulator on the passenger side fire wall. The accumulator is underneath the battery relay and a grouping of wires. Had to squeeze hand underneath a heater hose and an a/c line to remove cap and hook up hose. Nothing has to be removed to locate the valve just a little touchy feely. Valve faces a 45 forward toward the engine.
Service Gauge Port Valves
The high-pressure service gauge port valve is located on the A/C receiver drier manifold and tube assembly.
The low pressure service gauge port valve is located on the manifold of the A/C compressor manifold and tube assembly at the A/C compressor.
A/C evaporator core
Thermostatic expansion valve
Manifold and tube assembly—thermostatic expansion valve
Manifold and tube assembly—A/C compressor
A/C charge port valve (low side)
A/C pressure relief valve
A/C pressure transducer
A/C condenser core
A/C charge port valve (high side)
Manifold and tube assembly—receiver drier
Sensor—evaporator air discharge temperature
Your service port will always be in the larger line of the two .. which is low pressure side. It might be in the dryer also which is low side.. your dryer is about 3 inches across and 8 inches long and also has your pressure switch for the AC compressor in it.. holler if you dont find it now... thanks Jerry