JEEP GRAND CHEROKEE 2007 WK / 3.G Owners Manual

•Bi-Level
Air flows both through the outlets located in the
instrument panel and those located on the floor.
Air flows through the registers in the back of the
center console, and under the front seats to the rear
seat passengers. These registers can be closed to block
airflow. The center console outlets deliver conditioned
air while the floor outlets deliver heated air.
•Panel
Air flows through the outlets located in the in-
strument panel. Air flows through the registers in
the back of the center console to the rear seat passen-
gers. These registers can be closed to block airflow.
Depress this button to turn on and off the air
conditioning during manual operation only. Con-
ditioned outside air is then directed through theoutlets selected on the mode control dial. The button
includes an LED that illuminates when manual operation
is selected.
NOTE:To manually control the air conditioning the
mode selector must be moved out of the AUTO position.
This button can be used to block out smoke,
odors, dust, high humidity, or if rapid cooling
is desired. The recirculation mode should only
be used temporarily. The button includes an
LED that illuminates, which indicates that the recircula-
tion mode is active. You may use this feature separately.
UNDERSTANDING YOUR INSTRUMENT PANEL 241
4

NOTE:Extended use of recirculation may cause the
windows to fog. If the interior of the windows begins to
fog, press the “Recirculate” icon button to return to
outside air. Some temp./humidity conditions will cause
captured interior air to condense on windows and ham-
per visibility. For this reason, the system will not allow
“Recirculate” to be selected while in the defrost or
defrost/floor modes. Attempting to use the 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 on the Air-conditioning (pressing the snowflake
button) 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. Higher
blower 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 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.
242 UNDERSTANDING YOUR INSTRUMENT PANEL

When using the air conditioner in extremely heavy traffic
in hot weather especially when towing a trailer, addi-
tional engine cooling may be required. If this situation is
encountered, operate the transmission in a lower gear to
increase engine RPM, coolant flow and fan speed. When
stopped in heavy traffic, it may be necessary to shift into
N (Neutral) and depress the accelerator slightly for fast
idle operation to increase coolant flow and fan speed.
Your air conditioning system is also equipped with an
automatic recirculation system. When the system senses
a heavy load or high heat conditions, it may use partial
Recirculation A/C mode to provide additional comfort.Winter Operation
When operating the system during the winter months,
make sure the air intake, located directly in front of the
windshield, is free of ice, slush, snow, or other obstruc-
tions.
Vacation Storage
Anytime you store your vehicle, or keep it out of service
(i.e. vacation) for two weeks or more, run the air condi-
tioning system at idle for about five minutes in the fresh
air and high blower setting. This will insure adequate
system lubrication to minimize the possibility of com-
pressor damage when the system is started again.
UNDERSTANDING YOUR INSTRUMENT PANEL 243
4

Operating Tips Chart
244 UNDERSTANDING YOUR INSTRUMENT PANEL

STARTING AND OPERATING
CONTENTS

Starting Procedure......................249
▫Normal Starting — Gasoline Engines.......249
▫If Engine Fails To Start.................249
▫Normal Starting — Diesel Engines.........250

Engine Block Heater — If Equipped.........253

Automatic Transmission..................253
▫Brake/Transmission Interlock System.......254
▫5–Speed Automatic Transmission..........254
▫Gear Ranges.........................255▫Rocking The Vehicle...................261

Four-Wheel Drive Operation...............262
▫Quadra-Trac IOperating Instructions/
Precautions — If Equipped..............262
▫Quadra-Trac IIOperating
Instructions/Precautions — If Equipped.....262
▫Shift Positions........................264
▫Shifting Procedures....................264
▫Quadra-Drive IISystem — If Equipped.....267

On-Road Driving Tips...................268
5

Off-Road Driving Tips...................268
▫When To Use 4WD Low Range —
If Equipped.........................268
▫Driving Through Water.................268
▫Driving In Snow, Mud And Sand..........270
▫HillClimbing ........................270
▫Traction Downhill.....................271
▫After Driving Off-Road.................271

Parking Brake.........................272

Anti-Lock Brake System..................274

Power Steering........................277

Multi Displacement System (MDS) - 5.7L Engine
Only ................................278
Tire Safety Information...................278
▫Tire Markings........................278
▫Tire Identification Number (TIN)..........282
▫Tire Loading And Tire Pressure...........283

Tires — General Information...............287
▫Tire Pressure.........................287
▫Tire Inflation Pressures.................288
▫Tire Pressures For High Speed Operation....290
▫Radial-Ply Tires......................290
▫Tire Spinning........................290
▫Tread Wear Indicators..................291
▫LifeOfTire .........................292
▫Replacement Tires.....................292
246 STARTING AND OPERATING

▫Alignment And Balance.................293

Tire Chains...........................294

Tire Rotation Recommendations............294

Tire Pressure Monitor System (TPMS)........295
▫Base System — If Equipped..............297
▫Premium System — If Equipped..........300
▫General Information...................305

Fuel Requirements......................305
▫3.7/4.7L Engines (If Equipped)............305
▫5.7L Engines (If Equipped)...............306
▫Reformulated Gasoline.................306
▫Gasoline/Oxygenate Blends..............307
▫MMT In Gasoline.....................307▫Materials Added To Fuel................308
▫Fuel System Cautions..................308
▫Carbon Monoxide Warnings..............309

Flexible Fuel (4.7L Only) — If Equipped......309
▫E-85 General Information................309
▫Ethanol Fuel (E-85)....................310
▫Fuel Requirements....................310
▫Selection Of Engine Oil For Flexible Fuel Vehicles
(E-85) And Gasoline Vehicles.............311
▫Starting............................311
▫Cruising Range.......................311
▫Replacement Parts.....................311
▫Maintenance.........................312
STARTING AND OPERATING 247
5

Fuel Requirements — Diesel...............312

Adding Fuel..........................313
▫Fuel Filler Cap (Gas Cap)...............313

Vehicle Loading........................316
▫Certification Label.....................316

TrailerTowing .........................318
▫Common Towing Definitions.............318
▫Trailer Hitch Classification...............322
▫Trailer Towing Weights (Maximum Trailer Weight
Ratings)............................323▫Trailer And Tongue Weight..............325
▫Towing Requirements..................326
▫TowingTips .........................330

Recreational Towing (Behind Motorhome, Etc.) . . 332
▫Towing – 2WD Models.................332
▫Towing — Quadra-Trac I (Single-Speed Transfer
Case) 4WD Models....................332
▫Towing — Quadra–Trac II /Quadra–Drive II 4WD
Models............................332

Snow Plow...........................336
248 STARTING AND OPERATING

STARTING PROCEDURE
Start the engine with the selector lever in the N (Neutral)
or P (Park) position. Apply the brake before shifting to
any driving range.
Normal Starting — Gasoline Engines
Do notpress the accelerator. Turn the ignition key briefly
to START position, and release it. The starter motor will
continue to run, but will automatically disengage itself
when the engine is running.
NOTE:The starter motor may run up to 30 seconds in
very cold conditions until the engine is started. The
starter can be disengaged by turning the ignition key to
the OFF position, if required.
If Engine Fails to Start
If the engine fails to start after you have followed the
normal starting procedure, it may be flooded. Push the
accelerator pedal all the way to the floor and hold it there
while cranking the engine. This should clear any excess
fuel in case the engine is flooded.
NOTE:To prevent damage to the starter, do not crank
the engine for more than 15 seconds at a time. Wait 10 to
15 seconds before trying again.
If the engine has been flooded, it may start to run, but not
have enough power to continue running when the key is
released. If this occurs, continue cranking with the accel-
erator pedal pushed all the way to the floor. Release the
accelerator pedal and the key once the engine is running
smoothly.
STARTING AND OPERATING 249
5

If the engine shows no sign of starting after two 15
second periods of cranking with the accelerator pedal
held to the floor, the normal starting procedure should be
repeated.
WARNING!
Never pour fuel or other flammable liquids into the
throttle body air inlet opening in an attempt to start
the vehicle. This could result in a flash fire causing
serious personal injury.
Normal Starting — Diesel Engines
1. Turn the ignition key to the ON position.
2. Watch for the “Glow Plug Indicator Light” in the
instrument cluster. Refer to “Instrument Cluster” in
Section 4. It will glow for two to ten seconds or more,depending on engine temperature. When the “Glow Plug
Indicator Light” goes out, the engine is ready to start.
3.Do notpress the accelerator. Turn the ignition key
briefly to START position, and release it. The starter
motor will continue to run, but will automatically disen-
gage itself when the engine is running.
NOTE:The starter motor may run up to 30 seconds in
very cold conditions until the engine is started. The
starter can be disengaged by turning the ignition key to
the OFF position, if required.
4. After the engine starts, allow it to idle for approxi-
mately 30 seconds before driving. This allows oil to
circulate and lubricate the turbocharger.
250 STARTING AND OPERATING