My air conditioner is working, but the air is not coming out the front vents. I can hear a clicking noise as though the vents are trying to open, but it doesn't happen. The air is then sent to my feet and to the window defrost, but nothing directly at me. The air is cold and I can adjust the speed of the fan.

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

SOURCE: 2003 Ford Expedition XLT FX4 MAIN FAN CONTROL SWITCH

That usually means the circuit board for the fan motor is Burt out big job prob to replace dealer may be.

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

SOURCE: ac work but no thruogh vents

check air distribution switch on drivers side near center under dash