FORD 2004 Expedition v.1 - Manual (Page 205)

If a load is added to, or removed from the vehicle, the load leveling
feature of the air suspension system will adjust the suspension to keep
the vehicle at a constant level.
When exiting the vehicle, the air suspension will automatically lower the
vehicle to its lowest height to provide easier exit. You may hear a buzz or
click from the air suspension system when the ignition is turned off. The
air suspension system will stay active for 40 minutes after the ignition is
turned off to accommodate any load changes. (The air compressor may
run when the vehicle is off; this is normal.)
The air suspension shut-off switch is
located behind two access panels on
the left rear quarter trim panel, near
the liftgate. To remove the first
panel, turn the control
counterclockwise and remove the
panel.
On vehicles equipped with
air suspension, turn the air
suspension and the ignition switch
off prior to jacking, hoisting or
towing your vehicle.
2004 Expedition (exd)
Owners Guide (post-2002-fmt)
USA English (fus)
Driving
205