GMC 2009 Yukon XL Owner's Manual page 335

Off-roading can be great fun but has some definite
hazards. The greatest of these is the terrain itself. When
off-road driving, traffic lanes are not marked, curves are
not banked, and there are no road signs. Surfaces can be
slippery, rough, uphill, or downhill.
Avoid sharp turns and abrupt maneuvers. Failure to
operate the vehicle correctly off-road could result in loss
of vehicle control or vehicle rollover.
Off-roading involves some new skills. That is why it is
very important that you read these driving tips and
suggestions to help make off-road driving safer and more
enjoyable.
Before You Go Off-Roading
•
Have all necessary maintenance and service
work done.
•
Make sure there is enough fuel, that fluid levels are
where they should be, and that the spare tire, if the
vehicle has one, is fully inflated.
•
Be sure to read all the information about
four-wheel-drive vehicles in this manual.
•
Make sure all underbody shields, if the vehicle has
them, are properly attached.
•
Know the local laws that apply to off-roading where
you will be driving or check with law enforcement
people in the area.
•
Be sure to get the necessary permission if you will be
on private land.
If you think you will need some more ground clearance
at the front of your vehicle, you can remove the front
fascia lower air dam. The air dam is held in place by two
bolts and 10 snaps accessible from underneath the
front fascia.
To remove the air dam:
1. Remove the two outboard air dam bolts.
2. With a flat-blade tool, disengage the snaps.
3. After the bolts are removed and the snaps are
disengaged, push forward on the air dam until it
is free.
Notice: Operating your vehicle for extended
periods without the front fascia lower air dam
installed can cause improper air flow to the engine.
Always be sure to replace the front fascia air
dam when you are finished off-road driving.
After off-roading, be sure to reinstall the air dam:
1. Line up the snaps and push the air dam rearward to
engage the snaps.
2. Install the two outboard bolts.
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