coolant temperature JEEP WRANGLER 2012 JK / 3.G Owners Manual

13. Air Bag Warning LightThis light will turn on for four to eight seconds
as a bulb check when the ignition switch is first
turned to ON/RUN. If the light is either not on
during starting, stays on, or turns on while
driving, have the system inspected at an authorized
dealer as soon as possible. Refer to “Occupant Restraints”
in “Things To Know Before Starting Your Vehicle” for
further information.
14. Rear Axle Lock Indicator — If Equipped This light indicates when the rear axle lock has
been activated.
15. Tachometer
Indicates the engine speed in revolutions per minute
(RPM x 1000).CAUTION!
Do not operate the engine with the tachometer
pointer in the red area. Engine damage will occur.
16. Coolant Temperature Warning Light This light warns of an overheated engine condi-
tion. If the light turns on while driving, safely pull
over and stop the vehicle. If the A/C system is on,
turn it off. Also, shift the transmission into NEUTRAL
and idle the vehicle. If the temperature reading does not
return to normal, turn the engine off immediately and
call for service.
NOTE: As the coolant temperature gauge approaches
H, this indicator will illuminate and a single chime will
sound. Further overheating will cause the temperature
gauge to pass H.In this case, the indicator light will
flash continuously and a continuous chime will sound,
until the engine is allowed to cool.
4
UNDERSTANDING YOUR INSTRUMENT PANEL 273

17. Vehicle Security Light — If EquippedThis light will flash at a fast rate for approxi-
mately 15 seconds, when the vehicle security
alarm is arming, and then will flash slowly
until the vehicle is disarmed.
18. Temperature Gauge
The temperature gauge shows engine coolant tempera-
ture. Any reading within the normal range indicates that
the engine cooling system is operating satisfactorily.
The gauge pointer will likely indicate a higher tempera-
ture 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.CAUTION!
Driving with a hot engine 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 an autho-
rized dealership for service.
274 UNDERSTANDING YOUR INSTRUMENT PANEL

NOTE:There are steps that you can take to slow down
an impending overheat condition:
•If your air conditioner (A/C) is on, turn it off. The A/C
system adds heat to the engine cooling system and
turning the A/C off can help remove this heat.
•You can also turn the temperature control to maximum
heat, the mode control to floor and the blower 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.
WARNING!
You or others can be badly burned by hot engine
coolant (antifreeze) or steam from your radiator. If
you see or hear steam coming from under the hood,
do not open the hood until the radiator has had time
to cool. Never try to open a cooling system pressure
cap when the radiator or coolant bottle is hot.
JACKING AND TIRE CHANGING
WARNING!
•Do not attempt to change a tire on the side of the
vehicle close to moving traffic. Pull far enough off
the road to avoid the danger of being hit when
operating the jack or changing the wheel.
•Being under a jacked-up vehicle is dangerous. The
vehicle could slip off the jack and fall on you. You
could be crushed. Never put any part of your body
under a vehicle that is on a jack. If you need to get
under a raised vehicle, take it to a service center
where it can be raised on a lift.
•Never start or run the engine while the vehicle is
on a jack.
(Continued)
6
WHAT TO DO IN EMERGENCIES 493

Cooling System
WARNING!
You or others can be badly burned by hot engine
coolant (antifreeze) or steam from your radiator. If
you see or hear steam coming from under the hood,
do not open the hood until the radiator has had time
to cool. Never try to open a cooling system pressure
cap when the radiator or coolant bottle is hot.
Engine Coolant Checks
Check the engine coolant (antifreeze) protection every
12 months (before the onset of freezing weather, where
applicable). If the engine coolant (antifreeze) is dirty or
rusty in appearance, the system should be drained,
flushed and refilled with fresh engine coolant (anti-
freeze). Check the front of the A/C condenser (ifequipped) or radiator for any accumulation of bugs,
leaves, etc. If dirty, clean by gently spraying water from a
garden hose vertically down the face of the A/C con-
denser (if equipped) or the back of the radiator core.
Check the engine cooling system hoses for brittle rubber,
cracking, tears, cuts, and tightness of the connection at
the coolant recovery bottle and radiator. Inspect the
entire system for leaks.
With the engine at normal operating temperature (but
not running), check the cooling system pressure cap for
proper vacuum sealing by draining a small amount of
engine coolant (antifreeze) from the radiator drain cock.
If the cap is sealing properly, the engine coolant (anti-
freeze) will begin to drain from the coolant recovery
bottle. DO NOT REMOVE THE COOLANT PRESSURE
CAP WHEN THE COOLING SYSTEM IS HOT.
530 MAINTAINING YOUR VEHICLE

Adding Engine Coolant
Your vehicle has been built with an improved engine
coolant (antifreeze) that allows extended maintenance
intervals. This engine coolant (antifreeze) can be used up
to five years or 104,000 miles (169 000 km) before
replacement. To prevent reducing this extended mainte-
nance period, it is important that you use the same
engine coolant (antifreeze) throughout the life of your
vehicle.
Please review these recommendations for using Hybrid
Organic Additive Technology (HOAT) engine coolant
(antifreeze). When adding engine coolant (antifreeze):
•The manufacturer recommends using MOPAR
Antifreeze/Coolant 5 Year/100,000 Mile Formula
HOAT (Hybrid Organic Additive Technology) or
equivalent.
•Mix a minimum solution of 50% HOAT engine coolant
and distilled water. Use higher concentrations (not to
exceed 70%) if temperatures below 34°F (37°C) are
anticipated.
•Use only high purity water such as distilled or deion-
ized water when mixing the water/engine coolant
(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 engine coolant (antifreeze) types will
decrease the life of the engine coolant (antifreeze) and
will require more frequent coolant changes.
532 MAINTAINING YOUR VEHICLE

The radiator normally remains completely full, so there is
no need to remove the radiator cap unless checking for
engine coolant (antifreeze) freeze point or replacing en-
gine coolant (antifreeze). Advise your 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 engine coolant (antifreeze) 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/
kilometers of operation, you may observe vapor coming
from the front of the engine compartment. This is nor-
mally a result of moisture from rain, snow, or high
humidity accumulating on the radiator and being vapor-
ized when the thermostat opens, allowing hot engine
coolant (antifreeze) 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.
•Do not overfill the coolant bottle.
•Check the engine coolant (antifreeze) freeze point in
the radiator and in the coolant recovery bottle. If
engine coolant (antifreeze) needs to be added, the
contents of the coolant recovery bottle must also be
protected against freezing.
•If frequent engine coolant (antifreeze) 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.
•Maintain the engine coolant (antifreeze) concentration
at 50% HOAT engine coolant (antifreeze) (minimum)
and distilled water for proper corrosion protection of
your engine which contains aluminum components.
534 MAINTAINING YOUR VEHICLE

•Make sure that the radiator and coolant recovery
bottle hoses are not kinked or obstructed.
•Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean.
•Do 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.
Brake System
In order to assure brake system performance, all brake
system components should be inspected periodically.
Refer to the “Maintenance Schedule” for the proper
maintenance intervals.
WARNING!
Riding the brakes can lead to brake failure and
possibly a collision. Driving with your foot resting or
riding on the brake pedal can result in abnormally
high brake temperatures, excessive lining wear, and
possible brake damage. You would not have your full
braking capacity in an emergency.
Power Disc Brakes
Disc brakes do not require adjustment; however, several
hard stops during the break-in period are recommended
to seat the linings and wear off any foreign material.
Brake Master Cylinder
The fluid level in the master cylinders should be checked
whenever the vehicle is serviced. If necessary, add fluid
to bring level to the full level mark on the side of the
reservoir of the brake master cylinder. With disc brakes,
7
MAINTAINING YOUR VEHICLE 535

ABS (Anti-Lock Brake System)............272,417
Adding Engine Coolant (Antifreeze) .......... 532
Adding Fuel ........................... 465
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . 520
Air Conditioner Maintenance ............... 522
Air Conditioning ........................ 354
Air Conditioning Controls ................. 354
Air Conditioning Filter .................365,523
Air Conditioning Refrigerant ............... 523
Air Conditioning System ................354,358
Air Conditioning, Operating Tips ............ 366
Air Filter .............................. 520
Air Pressure, Tires ....................... 444
Airbag ................................ 58
Airbag Deployment ....................... 67
Airbag Light ..................... 65,69,87,273
Airbag Maintenance ....................... 69
Airbag, Side ............................ 65
Alarm (Security Alarm) .................... 19 Alarm Light
........................... 274
Alterations/Modifications, Vehicle ............. 9
Antenna, Satellite Radio ................317,342
Anti-Lock Brake System (ABS) .............. 417
Anti-Lock Warning Light .................. 272
Antifreeze (Engine Coolant) ................ 559
Appearance Care ........................ 541
Arming Theft System (Security Alarm) ......... 19
Assistance Towing ....................... 114
Auto Down Power Windows ................ 40
Automatic Door Locks ..................... 37
Automatic Oil Change Indicator ............. 292
Automatic Temperature Control (ATC) ......... 358
Automatic Transmission ................382,537
Fluid and Filter Changes ............... 537
Fluid Level Check .................... 538
Fluid Type ......................... 537
Special Additives ..................... 537
Autostick ............................. 389
592 INDEX

Fuel System Caution................... 463,465
Fuses ................................ 549
Gas Cap (Fuel Filler Cap) ............465,466,514
Gasoline (Fuel) ......................... 460
Gasoline, Reformulated ................... 460
Gauges Coolant Temperature .................. 274
Fuel .............................. 269
Odometer .......................... 277
Speedometer ........................ 269
Tachometer ......................... 273
Gear Ranges ........................ 377,384
Gear Select Lever Override ................. 507
General Information ................. 18,130,459
Glass Cleaning .......................... 545
Gross Axle Weight Rating ...............467,470
Gross Vehicle Weight Rating .............467,469
GVWR ............................... 467 Hands-Free Phone (Uconnect™)
.............. 99
HardTop ............................. 176
Hard Top Removal ....................... 184
Hard Top, Modular ...................... 176
Hazard Warning Flasher ................... 492
Head Restraints ......................... 142
Head Rests ............................ 142
Headlights Bulb Replacement .................... 556
Dimmer Switch ...................... 152
Replacing .......................... 556
Switch ............................ 150
Heated Seats ........................... 141
Heater ............................... 354
Heater, Engine Block ..................... 375
High Beam Indicator ..................... 270
Hill Descent Control ..................... 431
Hill Descent Control Indicator ............... 431
Hill Start Assist ......................... 420
598 INDEX

Tachometer............................ 273
Temperature Control, Automatic (ATC) ........ 358
Temperature Gauge, Engine Coolant .......... 274
Tether Anchor, Child Restraint ............... 76
Theft System Arming ...................... 19
Theft System Disarming .................... 20
Tilt Steering Column ..................... 158
Tip Start .............................. 373
Tire and Loading Information Placard ......438,439
Tire Identification Number (TIN) ............. 436
Tire Markings .......................... 432
Tire Safety Information .................... 432
Tires ............................ 89,443,589
Air Pressure ........................ 444
Chains ............................ 452
Changing .......................... 493
Compact Spare ...................... 447
General Information .................. 443
High Speed ......................... 445 Inflation Pressures
.................... 444
Jacking ......................... 493,497
Load Capacity .................... 438,439
Pressure Monitor System (TPMS) ......... 454
Pressure Warning Light ................ 275
Quality Grading ..................... 589
Radial ............................ 446
Replacement ........................ 450
Rotation ........................... 453
Safety ............................. 432
Sizes ............................. 434
Spare Tire .......................... 495
Spinning ........................... 448
Tread Wear Indicators ................. 449
To Open Hood .......................... 148
Tongue Weight/Trailer Weight .............. 477
Tow Hooks, Emergency ................... 506
Towing ............................ 469,508
24-Hour Towing Assistance ............. 114
10
INDEX 607