2010 JEEP GRAND CHEROKEE heating

captured interior air to condense on windows and ham-
per visibility. For this reason, the system will not allow
“Recirculation” mode to be selected while in the defrost
or defrost/floor modes. Attempting to use Recirculation
while in these modes will cause the LED in the button to
blink and then turn off.
Operating Tips
Window Fogging
Windows will fog on the inside when the humidity inside
the vehicle is high. This often occurs in mild or cool
temperatures when it’s rainy or humid. In most cases,
turning the air conditioning (pressing the snowflake
button) on will clear the fog. Adjust the temperature
control, air direction, and blower speed to maintain
comfort.
As the temperature gets colder, it may be necessary to
direct air onto the windshield. Adjust the temperature
control and blower speed to maintain comfort. Higherblower speeds will reduce fogging. Interior fogging on
the windshield can be quickly removed by selecting the
defrost mode.
Regular cleaning of the inside of the windows with a
non-filming cleaning solution (vinegar and water works
very well) will help prevent contaminates (cigarette
smoke, perfumes, etc.) from sticking to the windows.
Contaminates increase the rate of window fogging.Summer Operation
Air conditioned vehicles must be protected with a high
quality antifreeze coolant, during the summer, to provide
proper corrosion protection and to raise the boiling point
of the coolant for protection against overheating. A 50 %
concentration is recommended. Refer to Recommended
Fluids and Genuine Parts for the proper coolant type.
When using the air conditioner in extremely heavy
traffic, in hot weather, especially when towing a trailer,
232 UNDERSTANDING YOUR INSTRUMENT PANEL

NOTE:The Electronic Stability Program (ESP) and
Traction Control (if equipped) should be turned OFF
before attempting to rock the vehicle. Refer to “Electronic
Brake Control System” in “Starting and Operating” for
further information.
The least amount of accelerator pedal pressure to main-
tain the rocking motion without spinning the wheels or
racing the engine is most effective. Racing the engine or
spinning the wheels, due to the frustration of not freeing
the vehicle, may lead to transmission overheating and
failure. Allow the engine to idle with the shift lever in
NEUTRAL for at least one minute after every five
rocking-motion cycles. This will minimize overheating
and reduce the risk of transmission failure during pro-
longed efforts to free a stuck vehicle.CAUTION!
When “rocking” a stuck vehicle by moving between
DRIVE and REVERSE, do not spin the wheels faster
than 15 mph (24 km/h), or drivetrain damage may
result.
AUTOSTICK
AutoStick is a driver-interactive transmission that offers
manual gear shifting capability to provide the driver
with more control. AutoStick allows the driver to in-
crease engine braking ability, control upshift and down-
shift points, and enhance the driving experience. This
system can also provide the driver with more control
during passing, city driving, mountain driving, trailer
towing, and many other situations.
5
STARTING AND OPERATING 245

Safety
WARNING!
•Improperly inflated tires are dangerous and can
cause accidents.
•Under inflation increases tire flexing and can
result in over-heating and tire failure.
•Over inflation reduces a tire’s ability to cushion
shock. Objects on the road and chuck holes can
cause damage that results in tire failure.
•Unequal tire pressures can cause steering prob-
lems. You could lose control of your vehicle.
•Overinflated or under inflated tires can affect
vehicle handling and can fail suddenly, resulting
in loss of vehicle control.
•Unequal tire pressures from one side of the ve-
hicle to the other can cause the vehicle to drift to
the right or left.
Economy
Improper inflation pressures can cause uneven wear
patterns to develop across the tire tread. These abnormal
wear patterns will reduce tread life resulting in a need for
earlier tire replacement. Under inflation also increases
tire rolling resistance and results in higher fuel
consumption.
Ride Comfort and Vehicle Stability
Proper tire inflation contributes to a comfortable ride.
Over inflation produces a jarring and uncomfortable ride.
Both under inflation and over inflation affect the stability
of the vehicle and can produce a feeling of sluggish
response or over responsiveness in the steering.
Unequal tire pressures can cause erratic and unpredict-
able steering response.
Unequal tire pressure from side to side may cause the
vehicle to drift left or right.5
STARTING AND OPERATING 273

When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
Use speed control in flat terrain and with light loads to
maximize fuel efficiency.
Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
City Driving
When stopped for short periods of time, shift the trans-
mission into NEUTRAL and increase engine idle speed.
Highway Driving
Reduce speed.
Air Conditioning
Turn off temporarily.
RECREATIONAL TOWING (BEHIND
MOTORHOME, ETC.)
Recreational towing is not allowed.
CAUTION!
Towing this vehicle with any of its wheels on the
ground can cause severe transmission and/or transfer
case damage. Damage from improper towing is not
covered by your new vehicle warranty.
5
STARTING AND OPERATING 299

HAZARD WARNING FLASHERS
The Hazard Warning flasher switch is located on the
switch bank just above the climate controls.Press the switch to turn on the Hazard Warning
flasher. When the switch is activated, all directional
turn signals will flash on and off to warn oncoming
traffic of an emergency. Press the switch a second time to
turn off the Hazard Warning flasher.
This is an emergency warning system and should not be
used when the vehicle is in motion. Use it when your
vehicle is disabled and is creating a safety hazard for
other motorists.
If it is necessary to leave the vehicle to go for service, the
Hazard Warning flasher will continue to operate with the
ignition key removed and the vehicle locked.
NOTE: With extended use, the Hazard Warning flasher
may run down your battery.
IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
•On the highways — Slow down.
•In city traffic — While stopped, shift the transmission
to NEUTRAL, but do not increase the engine idle
speed.
302 WHAT TO DO IN EMERGENCIES

NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your exhaust
system. Do not park or operate your vehicle in areas
where your exhaust system can contact anything that
can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may indicate severe
and abnormal catalyst overheating. If this occurs, the
vehicle should be stopped, the engine shut off and the
vehicle allowed to cool. Thereafter, service, including a
tune-up to manufacturer’s specifications, should be ob-
tained immediately. To minimize the possibility of catalyst damage:
•Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
•Do not try to start engine by pushing or towing the
vehicle.
•Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing, or for prolonged periods during very rough
idling or malfunctioning operating conditions.
7
MAINTAINING YOUR VEHICLE 327

Checking Oil Level..................... 318
Compartment ......................... 313
Compartment Identification ............... 313
Coolant (Antifreeze) .................... 328
Cooling ............................. 328
Exhaust Gas Caution .................. 71,286
Fails to Start .......................... 239
Flooded, Starting ...................... 239
Fuel Requirements .................. 282,355
Jump Starting ......................... 304
Oil .............................. 318,355
Oil Change Interval .................... 319
Oil Selection ....................... 319,355
Overheating .......................... 302
Starting ............................. 238
Temperature Gauge .................... 162
Engine Oil Viscosity ...................... 320
Engine Oil Viscosity Chart ................. 320
Enhanced Accident Response Feature .......... 55Entry System, Illuminated
.................. 18
Ethanol ............................... 283
Exhaust Gas Caution ................71,286,326
Exhaust System ....................... 71,325
Exterior Finish Care ...................... 337
Exterior Lights .......................... 73
Filters Air Cleaner .......................... 321
Engine Oil ........................... 321
Engine Oil Disposal .................... 321
Finish Care ............................ 337
Flashers .............................. 302
Hazard Warning ....................... 302
Turn Signal ................... 73,157,351,352
Flipper Glass, Liftgate ..................... 33
Flooded Engine Starting ................... 239
Fluid, Brake ........................... 334
Fluid Capacities ......................... 355
392 INDEX

Multi-Function Control Lever............... 100
New Vehicle Break-In Period ................ 70
Occupant Restraints ................... 34,51,55
Occupant Restraints (Sedan) .............48,51,54
Octane Rating, Gasoline (Fuel) .............. 282
Odometer .......................... 163,164
Trip ................................ 163
Oil, Engine ............................ 318
Capacity ............................ 355
Change Interval ....................... 319
Checking ............................ 318
Disposal ............................ 321
Filter ............................... 321
Filter Disposal ........................ 321
Materials Added to ..................... 320
Pressure Warning Light .................. 160
Recommendation ................... 319,355Viscosity
............................ 355
Onboard Diagnostic System ..............314,315
Opener, Garage Door (HomeLink) ........... 128
Operator Manual (Owner’s Manual) ............ 5
Outside Rearview Mirrors .................. 81
Overhead Console ....................... 127
Overheating, Engine ................... 162,302
Owner’s Manual (Operator Manual) .........5,383
Paint Care ............................. 336
Paint Damage .......................... 336
Panic Alarm ............................ 22
Park Sense System, Rear ................... 119
Parking Brake .......................... 250
Passing Light ........................... 106
Pedals, Adjustable ....................... 114
Personal Settings ........................ 179
Pets .................................. 70
Pets, Transporting ........................ 70
398 INDEX