Air Suspension System; Variable Assist Steering - Ford Lincoln Navigator Owner's Manual

Driving
To help prevent damage to the power steering pump:
• Never hold the steering wheel to the extreme right or the extreme left
for more than a few seconds when the engine is running.
• Do not operate the vehicle with the power steering pump fluid level
below the MIN mark on the reservoir.
• 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

The air suspension system is designed to improve ride, handling and
general vehicle performance during:
• Certain road conditions
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2009 Navigator (nav)
Owners Guide, 1st Printing
USA (fus)