2004 JEEP GRAND CHEROKEE cooling

either too high or too low. Examine the gages carefully,
and follow the instructions above for each indicated
problem.
NOTE:When the ignition switch is turned to OFF, the
fuel gage, voltmeter, oil pressure, and temperature gages
will not show any readings. When the engine is not
running, turn the ignition switch to ON to obtain accu-
rate readings.
12. Part Time Indicator Light
This light alerts the driver that the vehicle is in
the PART TIME four±wheel drive mode, and
the front and rear driveshafts are mechanically
locked together forcing the front and rear wheels to rotate
at the same speed.
13. Transmission Over Temperature Warning Light
This light indicates that there is excessive transmis-
sion fluid temperature that might occur with severe
usage such as trailer towing or snow plowing. If this lightcomes on, stop the vehicle and run the engine at idle or
faster, with the transmission in N (Neutral) until the light
goes off.
14. Temperature Gage
Indicates engine coolant temperature. Any read-
ing within the normal range indicates that the
cooling system is operating satisfactorily.
The gage pointer will likely indicate a higher temperature
(above center scale) when driving in hot weather, up
mountain grades, or when towing a trailer. It should not
be allowed to exceed the upper limits of the normal
operating range.
If the pointer rises to the 260É (Hot) mark, pull over and
stop the vehicle. Do not turn the engine off. Idle the
vehicle with the air conditioning turned off, until the
pointer drops back into the normal range.
UNDERSTANDING YOUR INSTRUMENT PANEL 131
4

CAUTION!
Driving with a hot cooling system could damage
your vehicle. If the temperature gage reads high, 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 in
the high range, turn the engine off immediately, and
call for service.
15. Reset Button
Press this button to toggle between the odometer and trip
odometer display. When in the trip odometer mode,
holding the button in resets the trip odometer.
16. Odometer/Trip Odometer
The odometer shows the total distance the vehicle has
been driven. There are six digits including leading zeros.
The odometer is tamper-resistant.U.S. federal regulations require that upon transfer of
vehicle ownership, the seller certify to the purchaser the
correct mileage that the vehicle has been driven. There-
fore, if the odometer reading is changed during repair or
replacement, be sure to keep a record of the reading
before and after the service so that the correct mileage can
be determined.
The trip odometer records distance in miles from when-
ever the ªResetº button is pushed. To switch from the
odometer being displayed to the trip odometer being
displayed, press the ªResetº button.
17. O/D (Overdrive) Off Indicator Light
This light will illuminate when the O/D OFF
button has been selected. The O/D OFF button is
located on the gear shift lever.
132 UNDERSTANDING YOUR INSTRUMENT PANEL

²Floor
Air flows through the floor outlets located under
the instrument panel and into the rear seating
area through vents under the front seats.
²Bi-Level
Air flows both through the outlets located in the
instrument panel and those located on the floor.
²Panel
Air flows through the outlets located in the in-
strument panel.
²OFF
This position turns off the entire system.
Depress the A/C button to turn on and off the air
conditioning during manual operation only. Conditioned
outside air is then directed through the outlets selected
on the mode control dial.When the outside air contains smoke, odors, high humid-
ity, or if rapid cooling is desired you may wish to
recirculate interior air by pressing the ªRecirculateº icon
button. The recirculation mode should only be used
temporarily. The light on the A/C and ªRecirculateº icon
buttons will illuminate when these buttons are selected.
You may use these features separately or with one
another. Push in on the buttons a second time to change
the functions.
NOTE:If the interior of the windows begins to fog,
press the ªRecirculateº icon button to return to outside
air. Some temp./humidity conditions will cause captured
interior air to condense on windows and hamper visibil-
ity. For this reason, the system will not allow ªRecircu-
lateº to be selected while in the defrost or defrost/floor
modes.
To provide you with maximum comfort in the automatic
mode, during cold start-ups the blower fan will remain
UNDERSTANDING YOUR INSTRUMENT PANEL 169
4

NTire Spinning........................214
NTread Wear Indicators..................215
NReplacement Tires.....................215
NAlignment And Balance.................217
mTire Pressure Monitor System Ð If Equipped . . . 217
NTire Pressure Monitor System Tire/Wheel
Rotation And Sensor Replacement Ð If
Equipped...........................218
NGeneral Information...................219
mTire Chains...........................220
mTire Rotation Recommendations............220
mFuel Requirements......................221
NReformulated Gasoline.................222
NGasoline/Oxygenate Blends..............222NMMT In Gasoline.....................223
NSulfur In Gasoline.....................223
NMaterials Added To Fuel................224
mFuel Tank Filler Cap (Gas Cap).............224
mTrailer Towing.........................226
NTrailer And Tongue Weight..............228
NCooling System TipsÐTrailer Towing.......229
NMinimum Vehicle Requirements For Trailer
Towing............................230
mRecreational Towing (Behind Motorhome, Etc.) . . 231
NShifting Into Neutral (N)................232
NShifting Out Of Neutral (N)..............233
mSnow Plow...........................234
STARTING AND OPERATING 175
5

Always load a trailer with 60% of the cargo weight in the
front of the trailer. This places approximately 10% to 15%
of the GTW on the tow hitch of your vehicle. This portion
of the GTW becomes the tongue weight.
Trailer sway control and equalizing hitch are required for
tongue weights above 350 lbs (159 kg)., i.e., trailer
weights heavier than 3,500 lbs (1 587 kg).
Cooling System TipsÐTrailer Towing
To reduce potential for engine and transmission over-
heating in high ambient conditions, take the following
actions:
²City Traffic
When stopped, put transmission in N (Neutral) and
increase engine idle speed.
²Highway Driving
Reduce speed.
²Air Conditioning
Turn off temporarily.
To reduce the potential for transmission overheating,
turn the ªOverdriveº off when pulling any trailer or shift
the transmission to Drive position 2 on more severe
grades. Move the shift lever to the next lower position to
eliminate excessive transmission shifting. This action will
also reduce the possibility of transmission overheating
and provide better engine braking.
STARTING AND OPERATING 229
5

IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
²On the highways Ð Slow down.
²In city traffic Ð 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 ªHº,
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 ªHº, and you hear continuous chimes, turn the
engine off immediately, and call for service.
WHAT TO DO IN EMERGENCIES 237
6

NDriveline And Steering Component
Lubrication..........................267
NBody Lubrication.....................267
NWindshield Wiper Blades................268
NWindshield Washers Ð Front And Rear.....268
NExhaust System......................269
NCooling System.......................269
NHoses And Vacuum/Vapor Harnesses.......274
NBrake System........................274
NAutomatic Transmission................277
NTransfer Case........................280
NFront/Rear Axle Fluid..................281NAppearance Care And Protection From
Corrosion...........................281
mFuse Panel...........................286
NInterior Fuses........................286
NUnderhood Fuses
(Power Distribution Center)..............288
mVehicle Storage........................289
mReplacement Bulbs......................289
mFluid Capacities........................291
mRecommended Fluids, Lubricants And Genuine
Parts................................292
NEngine.............................292
NChassis............................293
250 MAINTAINING YOUR VEHICLE

WARNING!
Commercially available windshield washer solvents
are flammable. They could ignite and burn you. Care
must be exercised when filling or working around
the washer solution.
Exhaust System
The best protection against carbon monoxide entry into
the vehicle body is a properly maintained engine exhaust
system.
If you notice a change in the sound of the exhaust system;
or if the exhaust fumes can be detected inside the vehicle;
or when the underside or rear of the vehicle is damaged;
have an authorized technician inspect the complete ex-
haust system and adjacent body areas for broken, dam-
aged, deteriorated, or mispositioned parts. Open seams
or loose connections could permit exhaust fumes to seepinto the passenger compartment. In addition, inspect the
exhaust system each time the vehicle is raised for lubri-
cation or oil change. Replace as required.
Cooling System
WARNING!
You or others can be badly burned by hot coolant or
steam from your radiator. If you see or hear steam
coming from under the hood, don't open the hood
until the radiator has had time to cool. Never try to
open a cooling system pressure cap when the radia-
tor or coolant bottle is hot.
Coolant Checks
Check coolant protection every 12 months (before the
onset of freezing weather, where applicable). If coolant is
MAINTAINING YOUR VEHICLE 269
7