1. Disconnect the wire from the negative terminal of the battery.
2. Remove the center instrument panel trim (see "Removing and installing the instrument panel").
3. Remove the two screws securing the heating (air conditioning) and ventilation control unit to the instrument panel and move the unit away from the panel.
4. Use a screwdriver to pry up the holder of the control cable for the air temperature control flaps entering the passenger compartment, overcoming the elastic resistance, and remove it from the unit socket..
5. …and disconnect from the unit.
6. Remove the cable tip from the finger of the control sector of the air inlet temperature control flaps, overcoming the elastic resistance of the plastic parts.
7. Remove the flexible shaft end from the air flow distribution flap control drive, overcoming the elastic resistance of the plastic parts.
8. By squeezing the clamps, disconnect the common block of the air conditioner and recirculation mode switch wire harnesses from the unit…
9. …the wiring harness block of the fan mode switch…
10. …and remove the control unit for the heating (air conditioning) and ventilation system.
11. Install the heating (air conditioning) and ventilation control unit and all removed parts in the reverse order of removal.
The article was taken in its entirety from the specified website (FORDBOOK)