2007 JEEP GRAND CHEROKEE overheating

Canadian Programming/Gate Programming
Canadian radio-frequency laws require transmitter sig-
nals totime-out(or quit) after several seconds of
transmission which may not be long enough for
HomeLink to pick up the signal during programming.
Similar to this Canadian law, some U.S. gate operators are
designed totime-outin the same manner.
If you live in Canada or you are having difficulties
programming a gate operator by using theProgram-
mingprocedures (regardless of where you live),replace
Programming HomeLinkstep 3with the following:
NOTE:If programming a garage door opener or gate
operator, it is advised to unplug the device during the
cyclingprocess to prevent possible overheating.
3. Continue to press and hold the HomeLink button
while youpress and release every two seconds(cycle)
your hand-held transmitter until the frequency signal has
successfully been accepted by HomeLink. The EVICdisplay will show “CHANNEL X TRAINED” (where X is
Channel 1, 2, or 3). Proceed withProgrammingstep
four to complete.
Using HomeLink
To operate, simply press and release the programmed
HomeLink button. Activation will now occur for the
trained device (i.e. garage door opener, gate operator,
security system, entry door lock, home/office lighting,
etc.). For convenience, the hand-held transmitter of the
device may also be used at any time. In the event that
there are still programming difficulties or questions,
contact HomeLink at:www.homelink.com or 1-800-355-
3515.
Erasing HomeLink Buttons
To erase programming from the three buttons (individual
buttons cannot be erased but can bereprogrammed-
note below), follow the step noted:
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 151
3

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

In high ambient temperatures with sustained high engine
speed and load, an upshift followed shortly thereafter by
a downshift may occur. This is a normal part of the
overheat protection strategy when operating in the
“Tow/Haul” mode.
The transmission will downshift from Overdrive to the
most desirable gear if the accelerator pedal is fully
depressed at vehicle speeds above approximately 35 mph
(56 km/h).
When To Use “TOW/HAUL” Mode — If Equipped
When driving in hilly areas, towing a trailer, carrying a
heavy load, etc., and frequent transmission shifting oc-
curs, press the “TOW/HAUL” button. This will improve
performance and reduce the potential for transmission
overheating or failure due to excessive shifting. When
operating in “TOW/HAUL” mode, the transmission will
shift to direct gear and Overdrive will be enabled under
steady cruise conditions.The “TOW/HAUL” light will illuminate in the instru-
ment cluster to indicate when the switch has been
activated. Pressing the switch a second time restores
normal operation. If the “TOW/HAUL” mode is desired,
the switch must be pressed each time the engine is
started.
Tow/Haul Button
STARTING AND OPERATING 259
5

NOTE:The torque converter clutch will not engage
until the transmission fluid and engine coolant are warm
[usually after 1-3 miles (1.6 - 4.8 km) of driving]. Because
the engine speed is higher when the torque converter
clutch is not engaged, it may seem as if the transmission
is not shifting into Overdrive when cold. This is normal.
Manually shifting (using the ERS shift control) between 4
(direct gear) and 5/D (Overdrive gear) positions will
demonstrate that the transmission is able to shift into and
out of Overdrive.
NOTE:If the vehicle has not been driven in several
days, the first few seconds of operation after shifting the
transmission into gear may seem sluggish. This is due to
the fluid partially draining from the torque converter into
the transmission. This condition is normal and will not
cause damage to the transmission. The torque converter
will refill within five seconds of shifting from Park into
any other gear position.Rocking the Vehicle
If the vehicle becomes stuck in snow, sand, or mud, it can
often be moved by a rocking motion. Move the gear
selector rhythmically between D (Drive) and R (Reverse),
while applying slight pressure to the accelerator.
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 Section 3 of this manual.
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 transmission
selector in N (Neutral) for at least one minute after every
STARTING AND OPERATING 261
5

HAZARD WARNING FLASHERS
Your vehicle’s hazard warning flasher is an emergency
warning system. When you activate it, all front and rear
directional signals will flash intermittently. Use it when your
vehicle is disabled on or near the road. It warns other drivers
to steer clear of you and your vehicle. This is an emergency
warning system, not to be used when the vehicle is in motion.
To activate the warning flasher, push down on the button
on top of the steering column until it latches. To turn the
warning flasher off, push down again to unlatch the
button.
NOTE:With extended use, the 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, put transmission in N
(Neutral), but do not increase engine idle speed.
NOTE:There are steps that you can take to slow down
an impending overheat condition. If your air conditioner
is on, turn it off. The air conditioning system adds heat to
the engine cooling system and turning off the A/C
Hazard Warning Switch
338 WHAT TO DO IN EMERGENCIES

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 ex-
haust system. Do not park or operate your vehicle in
areas where your exhaust system can contact any-
thing that can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may suggest severe
and abnormal catalyst overheating. If this occurs, stop
the vehicle, turn off the engine and allow it to cool.
Service, including a tune up to manufacturer’s specifica-
tions, should be obtained immediately.
To minimize the possibility of catalytic converter dam-
age:
•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 the 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
idle or malfunctioning operating conditions.
Crankcase Emission Control System
Proper operation of this system depends on freedom
from sticking or plugging due to deposits. As vehicle
mileage builds up, the PCV valve and passages may
accumulate deposits. If a valve is not working properly,
replace it with a new valve. DO NOT ATTEMPT TO
CLEAN THE OLD PCV VALVE!
MAINTAINING YOUR VEHICLE 369
7

Electronic Vehicle Information
Center (EVIC).......................180,183
Emergency, In Case of
Freeing Vehicle When Stuck............... 261
Hazard Warning Flasher................. 338
Jacking............................. 339
Jump Starting......................... 346
Tow Hooks.......................... 349
Emission Control System Maintenance......359,412
Engine
Air Cleaner.......................... 367
Block Heater......................... 253
Break-In Recommendations................ 64
Compartment................354,355,356,357
Compartment Identification......354,355,356,357
Cooling ............................. 376
Exhaust Gas Caution.................. 65,309
Fails to Start.......................... 249
Fuel Requirements..................305,407Oil ..............................362,407
Oil Change Interval.................... 363
Oil Disposal.......................... 365
OilFilter ............................ 366
Oil Filter Disposal...................... 365
Oil Selection....................363,364,407
Oil Synthetic......................... 365
Overheating.......................... 338
Starting............................. 249
Temperature Gauge..................... 179
Engine Oil Viscosity...................364,365
Engine Oil Viscosity Chart..............364,365
Enhanced Accident Response Feature.......... 51
Entry System, Illuminated.................. 19
Event Data Recorder...................... 52
Exhaust Gas Caution................ 65,309,376
Exhaust System......................... 375
ExteriorFinishCare ...................... 390
456 INDEX

New Vehicle Break-In Period................ 64
Occupant Restraints....................... 34
Octane Rating, Gasoline (Fuel)............305,306
Odometer..........................180,181
Trip ................................ 180
Off-Pavement Driving (Off-Road)..........268,388
Off-Road Driving (Off-Pavement)..........268,388
Oil, Engine............................ 362
Capacity............................ 407
Change Interval....................... 363
Dipstick............................. 362
Disposal............................ 365
Filter ............................... 366
Filter Disposal........................ 365
Identification Logo..................... 364
Materials Added to..................... 365
Pressure Warning Light.................. 177
Recommendation.................363,364,407Synthetic............................ 365
Viscosity.......................364,365,407
Onboard Diagnostic System..............358,359
Opener, Garage Door (HomeLink) ........... 146
Outside Rearview Mirrors.................. 73
Overdrive............................. 258
Overdrive OFF Switch.................... 258
Overhead Console....................... 145
Overheating, Engine...................179,338
Owner’s Manual (Operator Manual).......... 448
PaintCare ............................. 389
Paint Damage.......................... 389
Panic Alarm............................ 22
Park Assist System, Rear.................. 138
Parking Brake.......................... 272
Passing Light........................... 118
Pedals, Adjustable....................... 124
Pets.................................. 64
INDEX 463
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