Check if your car is ellible for the recall. If so let Ford fix it.
It is most likely your resistor pack. The fan speed is controlled by resisitors is series with the fan. The high speed setting does not have a resistor, so it always works.
These resistors burn out really easy, and if one resitor blows all the speed settings are lost except the high speed.
To find your resitor pack you will have to look under the dash towards the center of the car passenger side. It is a whiteish color with a ceramic material base with a wire harness plugging into it. It snaps in place and is a little tricky to remove.
Check if you are covered first for the recall.
