I just recharged my 99 Expedition 4.6 L today.
Open hood and stand facing engine, look to left and 1st see the WW washer fill then the battery then at a 45 degree angle look to the firewall where you see a black cover just below the red and black battery cables going in and out of the solenoid. Underneath and behind is the Accumulator. On the side of this silver canister there is a hose coming out of the Accumulator and just to the right of it is a black cap over the Low side 13MM AC fitting. The cap does unscrew but the fitting takes a quick disconnect coupler fitting.
I found it helpful to search a parts outlet on the web and print a picture of an Accumulator for the Expedition. I was able to accomplish recharge with everything in place but next time it is likely I'll unscrew the two fasteners holding the wire assembly to the fire wall and move out of the way.
Best Wishes.
Bruce
Follow the lines until you find them. There should be two, one near the compressor or condenser (high side), and one near the evaporator (low side).
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