
Normal characteristics
On some four–wheel drive models, the initial shift from two-wheel drive to
four–wheel drive while the vehicle is moving can cause some momentary
clunk and ratcheting sounds. This is the front drivetrain coming up to
speed and engaging the front wheels, and is not cause for concern.
Sand
When driving over sand, try to keep all four wheels on the most solid
area of the trail. Avoid reducing the tire pressures but shift to a lower
gear and drive steadily through the terrain. Apply the accelerator slowly
and avoid spinning the wheels.
Note:If air is released from your tires, the Tire Pressure Monitoring
System (TPMS) indicator light may illuminate.
Avoid excessive speed because vehicle momentum can work against you
and cause the vehicle to become stuck to the point that assistance may
be required from another vehicle. Remember, you may be able to back
out the way you came if you proceed with caution.
If your vehicle is equipped with AdvanceTracwith RSC, press the
AdvanceTracwith RSC button (refer toAdvanceTracwith Roll Stability
Control (RSC) Stability Enhancement Systemin this chapter) while
driving in deep sand if you experience excessive engine power reduction.
Mud and water
If you must drive through high
water, drive slowly. Traction or
brake capability may be limited.
When driving through water,
determine the depth; avoid water
higher than the bottom of the hubs
(if possible) and proceed slowly. If
the ignition system gets wet, the
vehicle may stall.
Once through water, always try the
brakes. Wet brakes do not stop the vehicle as effectively as dry brakes.
Drying can be improved by moving your vehicle slowly while applying
light pressure on the brake pedal.
Be cautious of sudden changes in vehicle speed or direction when you
are driving in mud. Even four–wheel drive vehicles can lose traction in
slick mud. As when you are driving over sand, apply the accelerator
slowly and avoid spinning your wheels. If the vehicle does slide, steer in
the direction of the slide until you regain control of the vehicle.
Driving
249
2011 Navigator(nav)
Owners Guide, 1st Printing
USA(fus)

Descend a hill in the same gear you
would use to climb up the hill to
avoid excessive brake application
and brake overheating. Do not
descend in neutral; instead,
disengage overdrive or manually
shift to a lower gear. When
descending a steep hill, avoid
sudden hard braking as you could
lose control. When you brake hard,
the front wheels can’t turn and if
they aren’t turning, you won’t be
able to steer. The front wheels have to be turning in order to steer the
vehicle. Rapid pumping of the brake pedal will help you slow the vehicle
and still maintain steering control.
If your vehicle has anti-lock brakes, apply the brakes steadily. Do not
“pump” the brakes.
Driving on snow and ice
Four–wheel drive vehicles have advantages over two–wheel drive
vehicles in snow and ice but can skid like any other vehicle.
Should you start to slide while driving on snowy or icy roads, turn the
steering wheel in the direction of the slide until you regain control.
Avoid sudden applications of power and quick changes of direction on
snow and ice. Apply the accelerator slowly and steadily when starting
from a full stop.
Avoid sudden braking as well. Although a four–wheel drive vehicle may
accelerate better than a two-wheel drive vehicle in snow and ice, it won’t
stop any faster, because as in other vehicles, braking occurs at all four
wheels. Do not become overconfident as to road conditions.
Make sure you allow sufficient distance between you and other vehicles for
stopping. Drive slower than usual and consider using one of the lower gears.
In emergency stopping situations, apply the brake forcefully and steadily. Do
not “pump” the brakes. Refer to theBrakessection of this chapter for
additional information on the operation of the anti-lock brake system.
WARNING:If you are driving in slippery conditions that require
tire chains or cables, then it is critical that you drive cautiously.
Keep speeds down, allow for longer stopping distances and avoid
aggressive steering to reduce the chances of a loss of vehicle control
which can lead to serious injury or death. If the rear end of the vehicle
slides while cornering, steer in the direction of the slide until you
regain control of the vehicle.
Driving
251
2011 Navigator(nav)
Owners Guide, 1st Printing
USA(fus)

•You may want to turn off the speed control in hilly terrain if
unnecessary shifting between the top gears occurs. Unnecessary
shifting of this type could result in reduced fuel economy.
•Warming up a vehicle on cold mornings is not required and may
reduce fuel economy.
•Resting your foot on the brake pedal while driving may reduce fuel
economy.
•Combine errands and minimize stop-and-go driving.
Maintenance
•Keep tires properly inflated and use only recommended size.
•Operating a vehicle with the wheels out of alignment will reduce fuel
economy.
•Use recommended engine oil. Refer toMaintenance product
specifications and capacitiesin this chapter.
•Perform all regularly scheduled maintenance items. Follow the
recommended maintenance schedule and owner maintenance checks
found inscheduled maintenance information.
Conditions
•Heavily loading a vehicle or towing a trailer may reduce fuel economy
at any speed.
•Carrying unnecessary weight may reduce fuel economy (as much as
1 mpg [0.4 km/L] is lost for every 400 lb [180 kg] of weight carried).
•Adding certain accessories to your vehicle (for example; bug
deflectors, rollbars/light bars, running boards, ski/luggage racks) may
reduce fuel economy.
•Using fuel blended with alcohol may lower fuel economy.
•Fuel economy may decrease with lower temperatures during the first
8–10 miles (12–16 km) of driving.
•Driving on flat terrain offers improved fuel economy as compared to
driving on hilly terrain.
•Transmissions give their best fuel economy when operated in the top
cruise gear and with steady pressure on the gas pedal.
•Four-wheel drive operation (if equipped) is less fuel efficient than
two-wheel drive operation.
•Close windows for high speed driving.
Maintenance and Specifications
320
2011 Navigator(nav)
Owners Guide, 1st Printing
USA(fus)

refill capacities ........................331
specifications ..........................331
Event data recording ....................7
Exhaust fumes ..........................221
F
Fail safe cooling ........................309
Fleet MyKey programming ........98
Flexible Fuel Vehicle (FFV) ....311
Floor mats ...................................90
Fluid capacities .........................331
Fog lamps ....................................55
Four-Wheel Drive vehicles .......243
control trac .............................244
description ..............................244
driving off road .......................245
indicator light .........................244
preparing to drive your
vehicle .....................................233
Fuel ............................................311
calculating fuel
economy ............................22, 318
cap ...........................................314
capacity ...................................331
choosing the right fuel ...........315
detergent in fuel .....................316
filler funnel .............................316
filling your vehicle
with
fuel ...........................311, 314, 318
filter, specifications ........311, 330
fuel pump shut-off switch .....255
improving fuel economy ........318
octane rating ...........315, 334–335
quality ......................................316
running out of fuel .........273, 316
safety information relating
to automotive fuels ................311Fuel - flex fuel vehicle
(FFV) .................................311, 315
Fuses ..................................256–257
G
Garage door opener ....................84
Gas cap (see Fuel cap) ............314
Gas mileage
(see Fuel economy) .................318
Gauges .........................................18
H
Hazard flashers .........................254
Headlamps ...................................55
aiming ........................................57
autolamp system .......................55
bulb specifications ....................60
daytime running lights .............56
flash to pass ..............................56
high beam .................................56
turning on and off ....................55
Hood ..........................................296
I
Ignition .......................217, 334–335
Illuminated visor mirror .............68
Infant seats
(see Safety seats) .....................166
Inspection/maintenance (I/M)
testing ........................................323
Instrument panel
cleaning ...................................290
cluster ........................................12
Index
366
2011 Navigator(nav)
Owners Guide, 1st Printing
USA(fus)