2005 JEEP GRAND CHEROKEE heating

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 3rd gear and 4th 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 237
5

NOTE:The Electronic Stability Program (ESP) and
Traction Control (if equipped) should be turned OFF
before attempting to rock the vehicle. Refer to 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
five rocking-motion cycles. This will minimize overheat-
ing and reduce the risk of transmission failure during
prolonged efforts to free a stuck vehicle.CAUTION!
When “rocking” a stuck vehicle by moving between
“First” and R (Reverse), do not spin the wheels faster
than 15 mph (24 km/h), or drivetrain damage may
result.
FOUR-WHEEL DRIVE OPERATION
Quadra-Trac IOperating
Instructions/Precautions — If Equipped
The Quadra-Trac Iis a single speed (HI range only)
transfer case which provides convenient full-time
4–wheel drive. No driver interaction is required. This
transfer case divides engine torque almost evenly with 48
percent of engine torque to the front axle and 52 percent
of engine torque to the rear axle. The Brake Traction
Control System (BTC), which combines standard ABS
STARTING AND OPERATING 239
5

Cooling System Tips—Trailer Towing
To reduce potential for engine and transmission over-
heating in high ambient conditions, take the following
actions:
•City Traffic
When stopped, put transmission in N (Neutral) and
increase engine idle speed.
•Highway Driving
Reduce speed.
•Air Conditioning
Turn off temporarily.
To reduce the potential for transmission overheating,
turn the “TOW/HAUL” feature on when driving in hilly
areas or downshift the transmission to the next lower
gear range to eliminate excessive transmission shifting.
This action will also reduce the possibility of transmis-
sion overheating and provide better engine braking.
7–Pin Connector
STARTING AND OPERATING 287
5

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
removes this heat. You can also turn the Temperature
Control to maximum heat, the Mode Control to floor, and
the Fan Control to High. This allows the heater core to act
as a supplement to the radiator and aids in removing heat
from the engine cooling system.
CAUTION!
Driving with a hot cooling system could damage
your vehicle. If the temperature gauge reads “H”,
pull over and stop the vehicle. Idle the vehicle with
the air conditioner turned off until the pointer drops
back into the normal range. If the pointer remains on
the “H”, and you hear continuous chimes, turn the
engine off immediately, and call for service.
WHAT TO DO IN EMERGENCIES 297
6

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.
•Do not idle the engine for prolonged periods during
very rough idle or malfunctioning operating condi-
tions.
•Do not allow vehicle to run out of fuel.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
322 MAINTAINING YOUR VEHICLE

Engine
Air Cleaner.......................... 323
Block Heater......................... 232
Break-In Recommendations................ 63
Compartment......................... 311
Cooling............................. 329
Exhaust Gas Caution..................64,280
Fails to Start.......................... 231
Flooded, Starting...................... 231
Fuel Requirements..................277,357
Jump Starting......................... 303
Oil ..............................316,357
Oil Change Interval.................... 317
Oil Disposal.......................... 320
Oil Filter............................ 320
Oil Filter Disposal...................... 320
Oil Selection.......................... 357
Overheating.......................... 297
Starting............................. 230Temperature Gauge..................... 167
Engine Oil Viscosity...................... 319
Engine Oil Viscosity Chart................. 319
Enhanced Accident Response Feature.......... 50
Entry System, Illuminated.................. 15
Event Data Recorder...................... 51
Exhaust Gas Caution...................64,280
Exhaust System......................... 328
Exterior Finish Care...................... 341
Filters
Air Cleaner.......................... 323
Engine Fuel.......................... 323
Engine Oil........................... 320
Finish Care............................ 341
Flashers.............................. 296
Hazard Warning....................... 296
Turn Signal.....................164,353,355
Flipper Glass, Tailgate..................... 24
396 INDEX

Trip ................................ 168
Off-Pavement Driving..................250,344
Off-Road Driving.....................250,344
Oil, Engine............................ 316
Capacity............................ 357
Change Interval....................... 317
Dipstick............................. 316
Filter............................... 320
Identification Logo..................... 319
Materials Added to..................... 320
Pressure Warning Light.................. 166
Recommendation...................318,357
Viscosity..........................319,357
Onboard Diagnostic System..............313,314
Opener, Garage Door..................... 138
Outside Rearview Mirrors.................. 74
Overdrive............................. 236
Overdrive OFF Switch.................... 236
Overhead Console....................... 137Overheating, Engine...................168,297
Owner’s Manual........................ 389
Paint Care............................. 340
Paint Damage.......................... 340
Panic Alarm............................ 19
Park Assist System, Rear.................. 127
Parking Brake.......................... 244
Passing Light........................... 116
Pedals, Adjustable....................... 132
Pets.................................. 63
Pets, Transporting........................ 63
Phone, Cellular.......................... 76
Phone, Hands-Free....................... 76
Placard, Tire and Loading Information......... 260
Polishing and Waxing..................... 341
Power
Distribution Center..................... 346
Door Locks........................... 17
402 INDEX