I cant find a step by step procedure, but it shows to be under the right side of the dash.
Blower Motor Removal
# Remove the RH lower instrument panel insulator.
# For Navigator, remove the RH scuff plate.
# For Expedition models:
1. Remove the RH scuff plate.
2. Remove the RH lower A-pillar trim panel.
# Position the carpet aside.
# Remove the blower motor, as follows:
1. Disconnect the electrical connector and position the wire harness aside.
2. Remove the screws, then remove the blower motor.
#Installation is the reverse of the removal procedure
In this illustration, 4 is the resistor 5 is the power connection to the blower motor.