engine overheat JEEP WRANGLER 2015 JK / 3.G User Guide

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 con-
tact 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 control
device and may seriously reduce engine perfor-
mance 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.
610 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.
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.
7
MAINTAINING YOUR VEHICLE 611

NOTE:
•Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could
lead to severe internal engine damage. If any coolant is
needed to be added to the system please contact your
local authorized dealer.
•Mixing engine coolant (antifreeze) types is not recom-
mended and can result in cooling system damage. If
HOAT and OAT coolant are mixed in an emergency,
have a authorized dealer drain, flush, and refill with
OAT coolant (conforming to MS-12106) as soon as
possible.
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
recovery tank.
The cap should be inspected and cleaned if there is any
accumulation of foreign material on the sealing surfaces.
WARNING!
•Do not open hot engine cooling system. Never add
engine coolant (antifreeze) when the engine 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.
•Do not use a pressure cap other than the one
specified for your vehicle. Personal injury or en-
gine damage may result.7
MAINTAINING YOUR VEHICLE 615

Emission Control System Maintenance..........585
Engine
Air Cleaner...........................591
Block Heater..........................424
Break-In Recommendations.................98
Compartment..........................583
Compartment Identification................583
Coolant (Antifreeze).....................647
Cooling..............................611
Exhaust Gas Caution.....................100
Fails to Start...........................422
Flooded, Starting.......................422
Fuel Requirements......................525
Jump Starting..........................570
Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..588
Oil Change Interval......................331
Oil Selection...........................589
Oil Synthetic..........................590
Overheating...........................560
Starting..............................420
Temperature Gauge......................312
Engine Oil Viscosity.......................590
Engine Oil Viscosity Chart...................590
Enhanced Accident Response Feature............72
Entry System, Illuminated....................22
Ethanol................................526
Event Data Recorder........................75
Exhaust Gas Caution.......................100
Exhaust System...........................100
Exterior Lights...........................103
Fabric Care..............................628
Fabric Top..............................630
Filters
Air Cleaner...........................591
Air Conditioning.......................413
Engine Oil............................591
Engine Oil Disposal.....................59010
INDEX 677

Operator Manual (Owner’s Manual).............6
Outside Rearview Mirrors...................112
Overdrive...............................439
Overdrive OFF Switch......................439
Overheating, Engine.......................313
Owner’s Manual (Operator Manual).............6
Paint Care..............................625
Panic Alarm..............................26
Parking Brake............................466
Passing Light............................170
Personal Settings..........................338
Pets....................................98
Pets, Transporting..........................98
Phone, Cellular...........................115
Phone, Hands-Free (Uconnect®)...............115
Placard, Tire and Loading Information..........494
Power
Brakes...............................468
Door Locks............................40
Inverter..............................186
Mirrors..............................113
Steering..............................464
Windows..............................43
Power Steering Fluid.......................649
Pregnant Women and Seat Belts................60
Preparation for Jacking.....................565
Pretensioners
Seat Belts..............................60
Programmable Electronic Features.............338
Radial Ply Tires..........................501
Radiator Cap (Coolant Pressure Cap)...........615
Radio Operation..........................342
Radio (Sound Systems).....................342
Rear Axle (Differential).....................625
Rear Swing Gate...........................47
Rear Window Defroster.....................298
684 INDEX