2004 JEEP GRAND CHEROKEE coolant temperature

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

After Starting
The idle speed will automatically decrease as the engine
warms up.
CAUTION!
Long periods of engine idling, especially at high
engine speeds can cause excessive exhaust tempera-
tures which can damage your vehicle. Do not leave
your vehicle unattended with the engine running.
ENGINE BLOCK HEATER Ð IF EQUIPPED
The engine block heater warms engine coolant and
permits quicker starts in cold weather. Connect the cord
to a standard 110-115 volt AC electrical outlet with
grounded, three wire extension cord.
Use the heater when temperatures below 0ÉF (-18ÉC) are
expected to last for several days.The engine block heater cord is located:
²6-cylinder engine Ð bundled and fastened to the
injector rail between injectors 1 and 2.
²V-8 engine Ð coiled and strapped to the transmission
filler tube.
WARNING!
Remember to disconnect the cord before driving.
Damage to the 110-115 volt AC electrical cord could
cause electrocution.
178 STARTING AND OPERATING

Over Temperature Mode
The transmission electronics constantly monitor the
transmission oil temperature. If the transmission gets too
hot, the transmission will change the way it shifts to help
control the condition. This may result in a slightly
different feeling or response during normal operation in
D (Drive) position. If the transmission becomes hot
enough the O/D OFF indicator light and TRANS OVER
TEMP warning light in the instrument cluster may come
on. After the transmission cools down, it will return to
normal operation.
Torque Converter Clutch
A feature designed to improve fuel economy has been
added to the automatic transmission of this vehicle. A
clutch within the torque converter engages automatically
at calibrated speeds. This may result in a slightly differ-
ent feeling or response during normal operation in high
gear. When the vehicle speed drops or during accelera-
tion, the clutch automatically and smoothly disengages.NOTE:
²The torque converter clutch will not engage until the
transmission fluid and engine coolant are warm (usu-
ally after 1±3 miles (1.6±4.8 km) of driving). Because
engine speed is higher when the torque converter
clutch is not engaged, it may seem as if the transmis-
sion is not shifting into ªOverdriveº when cold. This is
considered a normal condition. Pressing the ªO/D
OFFº switch will show that the transmission is able to
shift into and out of ªOverdrive.º
²If the vehicle has not been driven for several days, the
first few seconds of operation after shifting the trans-
mission into gear may seem sluggish. This is due to the
transmission fluid partially draining from the torque
converter into the transmission. This is considered a
normal condition and will not cause damage to the
transmission. The torque converter will refill within 5
seconds of shifting from P (Park) into any other gear
position.
STARTING AND OPERATING 185
5

CAUTION!
²Mixing of coolants other than the specified HOAT
coolant may result in decreased corrosion protec-
tion and engine damage that may not be covered
under the new vehicle warranty. If a non-HOAT
coolant is introduced into the cooling system in an
emergency, it should be replaced with the speci-
fied coolant as soon as possible.
²Do not use plain water alone or alcohol base
antifreeze products. Do not use additional rust
inhibitors or antirust products, as they may not be
compatible with the radiator coolant and may
plug the radiator.
²This vehicle has not been designed for use with
Propylene Glycol based coolants. Use of Propy-
lene Glycol base coolants is not recommended.
Adding Coolant
When adding coolant, a minimum solution of 50% rec-
ommended HOAT ethylene glycol coolant in water
should be used. Use higher concentrations (not to exceed
70%) if temperatures below -37ÉF (-38ÉC) are anticipated.
Use only high purity water such as distilled or deionized
water when mixing the water/antifreeze solution. The
use of lower quality water will reduce the amount of
corrosion protection in the engine cooling system.
Please note that it is the owner's responsibility to main-
tain the proper level of protection against freezing ac-
cording to the temperatures occurring in the area where
the vehicle is operated.
NOTE:Mixing coolant types will decrease the life of the
engine coolant and will require more frequent engine
coolant changes.
MAINTAINING YOUR VEHICLE 271
7

Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of
coolant, and to insure that coolant will return to the
radiator from the coolant reserve tank.
The cap should be inspected and cleaned if there is any
accumulation of foreign material on the sealing surfaces.
WARNING!
The warning words DO NOT OPEN HOT on the
cooling system pressure cap are a safety precaution.
Never add coolant when the engine is overheated.
Do not loosen or remove the cap to cool an over-
heated engine. Heat causes pressure to build up in
the cooling system. To prevent scalding or injury, do
not remove the pressure cap while the system is hot
or under pressure.
Coolant Level
Check the coolant level at least once a month or more
often in hot weather. Check the level when the engine is
at normal operating temperature. Check the coolant level
only in the coolant recovery bottle. The coolant level
must be between the FULL and the ADD mark on the
bottle.
272 MAINTAINING YOUR VEHICLE

Adding Washer Fluid..................... 171
Adjustable Pedals........................ 84
Air Cleaner, Engine...................... 264
Air Conditioner Maintenance............... 265
Air Conditioning........................ 164
Air Conditioning Refrigerant............... 266
Air Conditioning System.................. 164
Air Filter.............................. 264
Air Pressure, Tires....................... 212
Airbag................................ 35
Airbag Deployment....................... 42
Airbag Light.......................44,52,129
Airbag Maintenance....................... 43
Alarm................................ 23
Alarm, Panic............................ 21
Alarm System........................... 23
Alignment and Balance................... 217
Alterations/Modifications, Vehicle............. 8
Antenna, Satellite Radio................... 155Antifreeze (Engine Coolant)................ 291
Anti-Lock Brake System................... 197
Anti-Lock Warning Light.................. 133
Anti-Theft System........................ 23
Appearance Care........................ 281
Arming Theft System...................... 23
Automatic Dimming Mirror................. 60
Automatic Door Locks..................... 19
Automatic Headlights..................... 77
Automatic Temperature Control............. 167
Automatic Transmission................179,277
Adding Fluid......................278,279
Fluid and Filter Changes................. 277
Fluid Level Check...................277,278
Fluid Type........................... 277
Gear Ranges.......................... 181
Overdrive........................... 182
Shifting............................. 179
Special Additives...................... 280
328 INDEX

Coolant Temperature Gauge.............. 131
Engine Oil Pressure Gauge............... 130
Freeing Vehicle When Stuck............... 186
Hazard Warning Flasher................. 236
Jacking............................. 242
Jump Starting......................... 246
Tow Hooks.......................... 248
Emission Control System Maintenance......254,296
Engine
Air Cleaner.......................... 264
Block Heater......................... 178
Break-In Recommendations................ 51
Compartment......................251,252
Cooling............................. 269
Exhaust Gas Caution.................... 51
Fails to Start.......................... 177
Flooded, Starting...................... 177
Fuel Requirements..................221,291
Jump Starting......................... 246Malfunction Indicator................... 130
Oil ................................ 291
Oil Change Interval.................... 258
Oil Disposal.......................... 260
Oil Filter............................ 260
Oil Filter Disposal...................... 260
Oil Pressure Gauge..................... 130
Oil Selection.......................... 291
Overheating.......................... 237
Starting............................. 176
Temperature Gauge..................... 131
Engine Oil Viscosity Chart................. 259
Entry System, Illuminated.................. 15
Exhaust Gas Caution...................... 51
Exhaust System......................... 269
Extender, Seat Belt........................ 35
Exterior Finish Care...................... 282
332 INDEX

Gasoline.............................. 221
Gasoline, Reformulated................... 222
Gasoline/Oxygenate Blends................ 222
Gauges
Coolant Temperature.................... 131
Fuel................................ 133
Odometer........................... 132
Oil Pressure.......................... 130
Speedometer......................... 129
Tachometer.......................... 129
Voltmeter............................ 129
Gear Ranges........................... 181
General Information...................... 219
Glass Cleaning.......................... 284
Glove Compartment...................... 116
Hazard Warning Flasher................... 236
Head Restraints.......................... 64
Head Rests............................. 64Headlights............................. 77
High Beam........................... 129
On With Wipers........................ 77
Heated Mirrors.......................... 61
Heated Seats............................ 71
Heater, Engine Block..................... 178
Holder, Cup........................... 116
Homelink Transmitter.................... 106
Hood Release........................... 74
Hoses................................ 274
Identifying Your Engine................251,252
Ignition
Key ................................. 11
Illuminated Entry........................ 15
Infant Restraint.......................... 44
Inflation Pressure Tires.................... 212
Information Center, Vehicle................. 90
Inside Rearview Mirror.................... 59
334 INDEX