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The Explorer Sport does not have rear AC. Only some of the 4 door Explorers had it.
The system could be a little low on Freon, but put a thermometer in the center AC registers and drive the vehicle with the AC on MAX and see what the temperature is out of the vents. It may feel cool to the hands, but see what the actual temperature is. It should be about 43 degrees, + or - 3 degrees.
It depends on the outside temperature and the humidity.
But check the temperature at the center vents while driving.
Please let me know if you need any more help.