Where do is the port to recharge my air conditioner on my 2004 Ford Explorer

Refrigerant does not evaporate from the closed system, nor does it go bad. It leaks out through a hole somewhere in the system. One pound of refrig is expensive, you system probably takes close to two. Have a shop determine the cause of the leak and have it fixed. To do the repair yourself you'll need a set of manifold gauges (about fifty bucks from a place like harbor freight) plus a vacuum pump to evac the system after replacing the defective part (about 150 bucks for a cheap one). You are already in 200 bucks before you purchase parts. You'll have to replace the accumulator/dryer along with any other part in need of replacement.

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