Lincoln 2008 Navigator Owner's Manual page 282

When one of the rear wheels is off the ground, the transmission
alone will not prevent the vehicle from moving or slipping off the
jack, even if the transmission is in P (Park). To prevent the vehicle
from moving when you change the tire, be sure that the parking brake
is set and the block the wheels (both front or both rear) on the
opposite end of the vehicle from the wheel being changed. If on a
grade, block both opposite wheels on the downward side of the hill. If
the vehicle slips off the jack, someone could be seriously injured.
• Front
• Rear
Turn off the running boards (if equipped) before jacking or
placing any object under the vehicle. Never place your hand
between the extended running board and the vehicle. A moving
running board may cause injury.
2008 Navigator (nav)
Owners Guide (post-2002-fmt)
USA (fus)
Roadside Emergencies
281