2012 JEEP WRANGLER engine overheat

into the passenger compartment. In addition, inspect the
exhaust system each time the vehicle is raised for lubri-
cation or oil change. Replace as required.
WARNING!
•Exhaust gases can injure or kill. They contain
carbon monoxide (CO), which is colorless and
odorless. Breathing it can make you unconscious
and can eventually poison you. To avoid breathing
CO, refer to “Safety Tips/Exhaust Gas” in “Things
To Know Before Starting Your Vehicle” for further
information.
•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
exhaust system. Do not park or operate your ve-
hicle in areas where your exhaust system can
contact anything that can burn.
CAUTION!
•The catalytic converter requires the use of un-
leaded fuel only. Leaded gasoline will destroy the
effectiveness of the catalyst as an emissions con-
trol device and may seriously reduce engine per-
formance and cause serious damage to the engine.
•Damage to the catalytic converter can result if your
vehicle is not kept in proper operating condition.
In the event of engine malfunction, particularly
involving engine misfire or other apparent loss of
performance, have your vehicle serviced promptly.
Continued operation of your vehicle with a severe
malfunction could cause the converter to overheat,
resulting in possible damage to the converter and
vehicle.
528 MAINTAINING YOUR VEHICLE

Under normal operating conditions, the catalytic con-
verter will not require maintenance. However, it is im-
portant to keep the engine properly tuned to assure
proper catalyst operation and prevent possible catalyst
damage.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
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, or for prolonged periods during very rough
idle or malfunctioning operating conditions.
7
MAINTAINING YOUR VEHICLE 529

Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of engine
coolant (antifreeze), and to ensure that engine coolant
(antifreeze) 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 engine coolant (antifreeze) when the en-
gine is overheated. Do not loosen or remove the cap
to cool an overheated 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.
Disposal Of Used Engine Coolant
Used ethylene glycol based engine coolant (antifreeze) is
a regulated substance requiring proper disposal. Check
with your local authorities to determine the disposal
rules for your community. To prevent ingestion by ani-
mals or children, do not store ethylene glycol based
engine coolant (antifreeze) in open containers or allow it
to remain in puddles on the ground. If ingested by a child
or pet, seek emergency assistance immediately. Clean up
any ground spills immediately.
Engine Coolant Level
The coolant bottle provides a quick visual method for
determining that the coolant level is adequate. With the
engine idling, and warm to normal operating tempera-
ture, the level of the engine coolant (antifreeze) in the
bottle should be between the ranges indicated on the
bottle.
7
MAINTAINING YOUR VEHICLE 533

Emergency, In Case ofJacking ............................ 493
Jump Starting ....................... 501
Tow Hooks ......................... 506
Emission Control System Maintenance ......... 515
Engine Air Cleaner ......................... 520
Block Heater ........................ 375
Break-In Recommendations .............. 84
Compartment ....................... 513
Compartment Identification ............. 513
Exhaust Gas Caution ................86,464
Fails to Start ........................ 373
Flooded, Starting ..................... 373
Fuel Requirements ................. 460,559
Jump Starting ....................... 501
Oil ............................ 518,559
Oil Change Interval ................... 292
Oil Disposal ........................ 520 Oil Filter
........................... 520
Oil Selection ........................ 559
Overheating ........................ 492
Starting ........................... 372
Temperature Gauge ................... 274
Engine Oil Viscosity ...................... 519
Engine Oil Viscosity Chart ................. 519
Enhanced Accident Response Feature .......... 66
Entry System, Illuminated .................. 20
Ethanol ............................... 461
Event Data Recorder ...................... 70
Exhaust Gas Caution ................... 86,464
Exhaust System ....................... 86,527
Extender, Seat Belt ........................ 58
Exterior Finish Care ...................... 542
Exterior Lights .......................... 89
Fabric Care ......................... 544,546
Fabric Top ............................. 546
596 INDEX

Outside Rearview Mirrors.................. 97
Overdrive ............................. 390
Overdrive OFF Switch .................... 390
Overheating, Engine ................... 274,492
Owner’s Manual (Operator Manual) .........6,587
Paint Care ............................. 541
Paint Damage .......................... 541
Panic Alarm ............................ 23
Parking Brake .......................... 414
Passing Light ........................... 152
Personal Settings ........................ 298
Pets .................................. 84
Phone, Cellular .......................... 99
Phone, Hands-Free (Uconnect™) .............. 99
Placard, Tire and Loading Information ......... 439
Polishing and Waxing ..................... 542 Power
Door Locks ......................... 36
Inverter ........................... 166
Mirrors ............................ 98
Steering ........................ 412,413
Windows ........................... 39
Pregnant Women and Seat Belts .............. 57
Preparation for Jacking .................... 495
Pretensioners Seat Belts ........................... 56
Programmable Electronic Features ............ 298
Radial Ply Tires ......................... 446
Radio Operation ........................ 354
Rear Axle (Differential) .................... 541
Rear Swing Gate ......................... 42
Rear Window Defroster ................... 261
Rear Window Features .................... 260
Rear Wiper/Washer ...................... 260
10
INDEX 603