2000 Freon Refill?

I have a question about recharging my car's ac system. Since the expedition has dual ac zones and controls, is there only one location to refill or are there multiple locations? Also what type of freon do i need, thanks in advance.

There are only the 2 service ports on your vehicle. You need to use 134a refrigerant. But, please be extremely careful if you try to do it yourself. The pressure in the system can overcome the pressure in the can and make the can a small bomb. Be careful.

I can see a visible port under the hood but i can not see the second port, where is that one located?

It should be the one back next to or on the accumulator. It isw close to the low pressure switch.

Do you put 1 can on each port or how do you refill it?

I can see 1 port next to the battery ( i know this is the 1) with a black cap...the other "port" that i see is on the driver side at the back and it has a green cap next to a round thing...any way i can get a diagram somewhere so i can see where's the other 1?

EXPED 4x4 5.4L

First off if you've never done this I would recommend you do it while someone who has supervises you. But what you really need is a set of gauges. Autozone sells one, they also sell just a recharge kit that taps into the low side. unfortunately this doesn't allow you to see what the high side pressure is at. Your system with rear A/C should hold about 56 OZ R134a.
You only charge through the low side, ALWAYS. Usually you can only do it while the cars running and A/C s on this will drop the static(just sitting) pressure of the system which is usually 100 to 120 psi to 30-40 psi on the low side which will allow the freon to be fed into the system. If you think you have a leak this is why its good to have a set of gauges you hook them up and check static pressure if low then you know right off the bat you have a leak. Expeditions are good for leaking at the manifold, which is the part that bolts up to the compressor. When charged to the proper level your low side should have an operating pressure of 30-40 with the high side of 160-225 depending on ambient temp. Sorry too long. But remember first thing s to be safe when dealing with A/C systems things can go wrong really fast I've had lines rupture on me due to pressures spiking up. Autozone or any other parts store sell manuals that deal specifically with just A/C systems

Thanks again..guess i will leave that to the pros :P