2010 Ford Expedition EL Owner Guide 3rd Printing - Page 300

Driving • Some noise is normal during operation. If the noise is excessive, check for low power steering pump fluid level before seeking service by your authorized dealer. • Heavy or uneven steering efforts may be caused by low power steering pump fluid level. Check for low power steering pump fluid level before seeking service by your authorized dealer. • Do not fill the power steering pump reservoir above the MAX mark on the reservoir, as this may result in leaks from the reservoir. If the power steering system breaks down (or if the engine is turned off), you can steer the vehicle manually, but it takes more effort. If the steering wanders or pulls, check for: • Underinflated tire(s) on any wheel(s) • Uneven vehicle loading • High crown in center of road • High crosswinds • Wheels out of alignment • Loose or worn suspension components Variable assist steering Your vehicle is equipped with variable assist power steering. At low engine RPM, steering assist will adjust to reduce efforts and improve low speed maneuverability. At high engine RPM, the assist will adjust to improve steering feel at high speeds. If the amount of effort required to steer your vehicle changes while driving at a constant engine RPM, have the power steering system checked by your authorized dealer. AIR SUSPENSION SYSTEM (IF EQUIPPED) The air suspension system is designed to improve ride, handling and general vehicle performance during: • Certain road conditions • Steering maneuvers • Braking • Acceleration 300 2010 Expedition (exd) Owners Guide, 3rd Printing USA (fus)