2007 JEEP GRAND CHEROKEE engine

NOTE:To ensure proper compass calibration, make
sure the compass variance is properly set before manu-
ally calibrating the compass. Refer to Variance Map.
To Put Into a Calibration Mode
Start the engine and leave the transmission in the P (Park)
position. Set the display to “Compass/Temperature.”
Press and hold the C/T button for approximately 5
seconds to change the display to compass variance mode;
holding the button for an additional 5 seconds will flash
the “CAL” symbol indicating compass calibration mode.
When the “CAL” indicator is flashing, complete one or
more 360 degree turns, under 5 mph (8 km/h), in an area
free from large metal objects or power lines. The “CAL”
indicator will turn off and the compass will function
normally.Compass Varianceis the difference between magnetic
north and geographic north. In some areas of the country,
the difference between magnetic and geographic north is
great enough to cause the compass to give false readings.
If this occurs, the compass variance must be set according
to the Compass Variance Map.
Compass/Temperature Button
196 UNDERSTANDING YOUR INSTRUMENT PANEL

Slight changes in engine speed or power may be noticed
when the air conditioning compressor is on. This is a
normal occurrence as the compressor will cycle on and
off to maintain comfort and increase fuel economy.
Automatic Temperature Control — If Equipped
The Infrared Dual-Zone Climate Control System auto-
matically maintains the interior comfort level desired by
the driver and passenger. This is accomplished by a dual
sun-sensor in the top of the instrument panel, and an
infrared sensor located in the face of the control unit.
There are also various sensors monitored by this system
which take account for vehicle speed, A/C pressure,
outside temperature, and engine cooling temperature.
The infrared sensor independently measures the surface
temperature of the driver and passenger. Based on the
sensor input, the system automatically adjusts the air
flow temperature, the air flow volume, and amount of
outside air recirculation. This maintains a comfortable
temperature even under changing conditions.NOTE:The numbers on the temperature dial represent
a comfort setting when the Mode knob is set to Auto, and
not the actual air temperature.
Operation of the system is quite simple. Begin by turning
the right mode knob to AUTO, and place the blower
control (left knob) to either LO AUTO or HI AUTO. The
Automatic Temperature Controls
236 UNDERSTANDING YOUR INSTRUMENT PANEL

debris due to the climate control sensor’s location.
Mud on the windshield may also cause poor operation
of this system.
•To provide you with maximum comfort in the auto-
matic mode, during cold start-ups the blower fan will
remain off until the engine warms up. However, the
fan will engage immediately if the defrost mode is
selected or if you manually select a blower speed.
•Under certain conditions (after the vehicle is turned
off) the climate control system may recalibrate and a
noise may be heard for 20 seconds. This is part of
normal operation.
•Most of the time, when in Automatic operation, you
can temporarily put the system into recirculation
mode by pressing the Recirc button. However, under
certain conditions in automatic the system is blowing
air out of the defrost vents. When these conditions arepresent and the Recirc button is pressed the indicator
will flash and remain off. This tells you that you are
unable to go into recirculation mode at this time. If you
would like to go to Recirculation mode, you must first
move your mode knob to panel, panel/floor or floor,
then hit the Recirc button. This feature will reduce the
possibility of window fogging.
Manual Operation
This system offers a full complement of manual override
features which consist of Blower Preferred Automatic,
Mode Preferred Automatic with Manual Air Temperature
Control and Manual. This means the customer can over-
ride the blower, mode and disable automatic temperature
control completely.
NOTE:Please read the Automatic Temperature Control
Operation Chart below for details.
238 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
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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
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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
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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
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