1997 Ford Expedition Owner's Manual - Page 111

Driving and selection of two or four-wheel drive modes. The air suspension system places the vehicle at its lowest height to provide easy entry and exit when the vehicle is parked, the ignition is turned off and all doors are closed. The air suspension system raises the vehicle approximately 2.5 cm (1 in) to its normal ride position when the ignition is turned on, the transmission is initially shifted into the drive or reverse mode and all doors are closed. In 4WD Low, the air suspension system raises the vehicle an additional 2.5 cm (1 in) above the normal ride height to improve vehicle ground clearance. However, if the vehicle speed exceeds 40 km/h (25 mph), the system will lower the vehicle to its normal ride height to maximize ride comfort. The vehicle will raise again if vehicle speed is less than 13 km/h (8 mph) for one minute. In 4WD Low, do not exceed 56 km/h (35 mph). As a safety consideration, whenever a door is opened (including the liftgate and liftgate glass) the system memorizes and maintains the height at the moment the door was opened. The system will maintain this height until all doors are closed or until vehicle speed exceeds 16 km/h (10 mph). 112