2004 JEEP WRANGLER coolant temperature

15. Coolant Temperature Gauge
Indicates engine coolant temperature. The red
zone to the far right indicates possible overheat-
ing. Seek authorized service immediately if the
gauge operates in the red zone. In U.S. vehicles,
temperature is indicated in degrees fahrenheit; in
Canadian vehicles in degrees centigrade.
16. Airbag Warning Light
This indicator lights and remains lit for 6 to
8 seconds when the ignition is first turned
on. If the light does not come on for 6 to 8
seconds, stays on or comes on while driving,
have the airbag system checked by an authorized
dealer.
17. Check Gauges Warning Light
This light monitors the engine coolant tem-
perature, engine oil pressure, and voltage
gauges. If it detects an extreme condition a
chime will sound and the light will come on. If the
light comes on, check the operation of these gauges for
a malfunction condition.18. Malfunction Indicator Light
This light is a part of an Onboard Diagnostic
System called OBD II that monitors engine,
and automatic transmission control systems.
The light will illuminate when the ignition is in the
ON position before engine start. If the bulb does not
come on when turning the key from OFF to ON, have
the condition checked promptly.
Certain conditions such as a loose or missing gas cap,
poor quality fuel, etc. may illuminate the light after
engine start. The vehicle should be serviced if the light
stays on through several typical driving styles. In most
situations, the vehicle will drive normally and will not
require towing.
When the engine is running, the ªMalfunction Indicator
Lightº may flash to alert serious conditions that could
lead to immediate loss of power or severe catalytic
converter damage. The vehicle should be serviced as
soon as possible if this occurs.
118 UNDERSTANDING YOUR INSTRUMENT PANEL

WARNING!
Never pour fuel or other flammable liquids into the
throttle body air inlet opening in an attempt to start
the vehicle. This could result in a flash fire causing
serious personal injury.
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 a
grounded, three wire extension cord. The engine block
heater cord is found under the hood clipped to the tie rod
between the radiator grille and the dash panel.
WARNING!
Remember to disconnect the cord before driving.
Damage to the 110-115 volt AC electrical cord could
cause electrocution.
Use the heater when temperatures below 0ÉF (-18ÉC) are
expected to last for several days.
162 STARTING AND OPERATING

Adding Coolant
When adding coolant, a minimum solution of recom-
mended 50% ethylene glycol antifreeze 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.
NOTE:Mixing coolant types will decrease the life of the
engine coolant and will require more frequent engine
coolant changes.
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.
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
The coolant bottle provides a quick visual method for
determining that the coolant level is adequate. The
coolant level must be at the FULL mark or above the
ADD mark on the bottle.
The radiator normally remains completely full, so there is
not need to remove the radiator cap unless checking for
coolant freeze point or replacing coolant. Advise your
MAINTAINING YOUR VEHICLE 241
7

service attendant of this. As long as the engine operating
temperature is satisfactory, the coolant bottle need only
be checked once a month.
When additional coolant is needed to maintain the
proper level, it should be added to the coolant bottle. Do
not overfill.
Points To Remember
NOTE:
When the vehicle is stopped after a few miles of
operation, you may observe vapor coming from the front
of the engine compartment. This is normally a result of
moisture from rain, snow, or high humidity accumulat-
ing on the radiator and being vaporized when the
thermostat opens, allowing hot coolant to enter the
radiator.
If an examination of your engine compartment shows no
evidence of radiator or hose leaks, the vehicle may be
safely driven. The vapor will soon dissipate.
²Do not overfill the coolant bottle.
²Check coolant freeze point in the system.
²If frequent coolant additions are required, or if the
level in the recovery bottle does not drop when the
engine cools, the cooling system should be pressure
tested for leaks.
²Maintain coolant concentration at 50% ethylene glycol
antifreeze (minimum) in water for proper corrosion
protection of your engine that contains aluminum
components.
²Make sure that the radiator and coolant bottle hoses
are not kinked or obstructed.
²Do not change the thermostat for summer or winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory cooling performance, poor gas
mileage, and increased emissions.
Hoses and Vacuum/Vapor Harnesses
Inspect surfaces of hoses and nylon tubing for evidence
of heat and mechanical damage. Hard or soft spots,
brittle rubber, cracking, tears, cuts, abrasions, and exces-
sive swelling indicate deterioration of the rubber.
242 MAINTAINING YOUR VEHICLE

Coolant Level........................ 241
Disposal of Used Coolant............... 240
Drain, Flush, and Refill................. 239
Inspection........................... 239
Points to Remember................... 242
Pressure Cap........................ 241
Selection of Coolant................240,258
Temperature Gauge.................... 118
Corrosion Protection.................... 248
Crankcase Emission Control System......... 234
Cruise Control.......................... 60
Cruise Light........................... 116
Cup Holder............................ 64
Customer Assistance.................... 280
Daytime Running Lights.................. 58
Dealer Service......................... 227
Defroster, Rear Window.................. 154
Defroster, Windshield.................151,153
Delay Wipers........................... 58
Deploying, Airbag....................... 27
Diagnostic System, Onboard............... 225
Dimmer Switch, Headlight................. 57Dipsticks
Oil (Engine)......................... 228
Disabled Vehicle Towing................. 219
Disposal
Engine Oil.......................... 231
Used Coolant........................ 240
Door Locks............................ 15
Doors................................ 15
Drive Belts............................ 231
Driving.............................. 181
Off-Pavement........................ 181
Off-Road........................... 181
On Hills............................ 182
On Slippery Surfaces.................. 181
When to Use Low Range............... 181
Dual Top.............................. 66
Electrical Outlet, Auxiliary................. 63
Electrical Power Outlets................... 63
Electronic Speed Control.................. 60
Emergency Brake....................... 175
Emergency, In Case of
Brake Warning Light................... 119
290 INDEX

Coolant Temperature Gauge............. 118
Engine Oil Pressure Gauge.............. 117
Jacking............................. 211
Jump Starting........................ 216
Emission Control System Maintenance....226,262
Engine
Air Cleaner.......................... 234
Block Heater......................... 162
Break-In Recommendations............... 39
Compartment........................ 224
Exhaust Gas Caution................... 40
Fails to Start......................... 161
Flooded, Starting..................... 161
Fuel Requirements.................197,258
Jump Starting........................ 216
Oil .............................228,258
Oil Disposal......................... 231
Oil Filter............................ 231
Oil Pressure Gauge.................... 117
Oil Selection......................... 258
Overheating......................... 210
Starting............................ 160
Temperature Gauge.................... 118Engine Oil Viscosity Chart................ 230
Entry System, Illuminated................. 15
Exhaust Gas Caution..................... 40
Exhaust System........................ 238
Extender, Seat Belt....................... 21
Exterior Finish Care..................... 249
Fabric Care........................250,252
Fabric Top............................ 250
Filters
Air Cleaner.......................... 234
Engine Fuel......................... 234
Engine Oil.......................... 231
Finish Care........................... 249
Flashers
Hazard Warning...................... 210
Turn Signal.......................... 116
Flooded Engine Starting.................. 161
Fluid Capacities........................ 258
Fluid Level Checks...................... 248
Automatic Transmission................ 245
Engine Oil.......................... 228
Manual Transmission.................. 247
INDEX 291
10

Power Steering....................... 236
Fog Lights............................. 58
Folding Rear Seat....................... 52
Folding Windshield..................... 102
Four Wheel Drive...................... 170
Shifting............................ 171
Four Wheel Drive Operation.............. 170
Front Axle............................ 248
Fuel................................. 197
Filler Cap........................... 200
Filter.............................. 234
Gasoline............................ 197
Gauge............................. 120
Materials Added...................... 199
Octane Rating........................ 197
Requirements........................ 258
Tank Capacity........................ 258
Fuel System Caution.................... 200
Fuses................................ 254
GasCap .............................. 200
Gasoline............................. 197
Gasoline, Reformulated.................. 198Gasoline/Oxygenate Blends............... 198
Gauges
Coolant Temperature................... 118
Fuel............................... 120
Odometer........................... 119
Oil Pressure......................... 117
Speedometer......................... 117
Tachometer.......................... 116
Voltmeter........................... 116
Gear Ranges........................164,166
Glass Cleaning......................... 252
Glove Compartment..................... 65
HardTop .............................. 78
Hard Top Removal...................... 79
Hazard Warning Flasher.................. 210
Headlights
Dimmer Switch....................... 57
Switch.............................. 57
Heater............................... 150
Heater, Engine Block.................... 162
High Beam Indicator.................... 117
Holder, Cup........................... 64
292 INDEX

Sentry Key............................ 12
Sentry Key Programming.................. 13
Sentry Key Replacement.................. 13
Service Assistance...................... 280
Service Contract........................ 282
Service Manuals........................ 285
Setting the Clock....................... 120
Shift Indicator Light..................... 117
Shift Speeds, Manual Transmission.......... 164
Shifting.............................. 163
Automatic Transmission................ 165
Manual Transmission.................. 163
Shoulder Belt Upper Anchorage............. 21
Shoulder Belts.......................... 17
Signals, Turn........................58,116
Snow Chains.......................... 196
Snow Plow........................... 205
Soft Top............................... 82
Spare Tire............................ 213
Spark Plugs........................... 232
Specifications
Fuel............................... 197
Oil ................................ 230Speed Control.......................... 60
Speedometer.......................... 117
Starting.............................. 160
Automatic Transmission................ 160
Emergency (Jump Starting).............. 216
Engine Block Heater................... 162
Engine Fails to Start................... 161
Manual Transmission.................. 160
Starting Procedures..................... 160
Steering
Power............................. 236
Tilt Column.......................... 60
Wheel Lock.......................... 14
Wheel, Tilt........................... 60
Storage............................65,256
Storage, Vehicle........................ 256
Storing Your Vehicle..................... 256
Supplemental Restraint System - Airbag....... 22
Tachometer........................... 116
Temperature Gauge, Engine Coolant......... 118
Tether Anchor, Child Restraint.............. 33
Tilt Steering Column..................... 60
INDEX 297
10