Ford Repair Questions? Ask a Mechanic for Answers ASAP
Does the AC compressor turn on when the AC is turned on?How did you check the EVAP temp sensor?
The system has a Freon leak. When the system charge is low, you will get uneven temperature from the dash vents. You will need to have the AC system tested for leaks.
Worst case would be the evaporator which the dash has to be removed to replace it. As for the cost, probably $800.