Freon is fine. What could it be?
It could be caused by many things. There is not enough information given to narrow it down. It could be:
1. The blend doors not operating properly.
2. Compressor not running.
3. Refrigerant low. I know you said that the Freon was ok, but you did not state how you knew. therefore, I can not be sure this is true.
If you want it to work soon, your best bet is to take it to a shop who works on Ford air conditioners.