radiator cap JEEP WRANGLER UNLIMITED 2013 Owners Manual

CAUTION!Driving with a hot cooling system could damage your
vehicle. If the temperature gauge reads HOT (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 HOT
(H), and you hear continuous chimes, turn the engine
off immediately, and call for service.
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.
6 WHAT TO DO IN EMERGENCIES 539

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 (antifreeze). Check the front of the A/C condenser (if equipped) or
radiator for any accumulation of bugs, leaves, etc. If dirty,
clean by gently spraying water from a garden hose verti-
cally down the face of the A/C condenser (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.
7 MAINTAINING YOUR VEHICLE 577

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 is not
recommended and can result in cooling system damage.
Drain, flush, and refill as soon as possible to avoid
damage if coolant types are mixed in an emergency.
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!• The warning words “DO NOT OPEN HOT” on the
cooling system pressure cap are a safety precaution.
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.580 MAINTAINING YOUR VEHICLE

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 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. 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.
7 MAINTAINING YOUR VEHICLE 581

Fluid Level Check ..................... .586
Fluid Type .......................... .585
Special Additives ...................... .585
Autostick .............................. .426
Auxiliary Electrical Outlet (Power Outlet) ....... .182
Auxiliary Power Outlet .................... .182
Axle Lock .............................. .433
Battery ................................ .570
Keyless Transmitter Replacement (RKE) ........27
Belts, Seat ...............................48
Body Mechanism Lubrication ................ .572
Brake Assist System ...................... .457
Brake Control System, Electronic ............. .456
Brake System ........................... .583
Anti-Lock (ABS) ...................... .455
Master Cylinder ....................... .583
Parking ............................. .452
Warning Light ........................ .302 Brake/Transmission Interlock ................ .419
Break-In Recommendations, New Vehicle .........98
Bulb Replacement ........................ .606
Bulbs, Light ............................ .103
Calibration, Compass ..................... .318
Capacities, Fluid ......................... .610
Caps, Filler
Fuel ............................... .510
Power Steering ....................... .451
Radiator (Coolant Pressure) .............. .580
Carbon Monoxide Warning ................. .100
Cargo Light ............................ .172
Car Washes ............................ .592
Cellular Phone ...........................114
Center High Mounted Stop Light ............. .609
Certification Label ........................ .513
Chains, Tire ............................ .492
Changing A Flat Tire ...................... .540
10 INDEX 635

Chart, Tire Sizing ........................ .473
Check Engine Light
(Malfunction Indicator Light) ...............311
Checking Your Vehicle For Safety ...............99
Checks, Safety ............................99
Child Restraint ............................76
Child Safety Locks .........................40
Clean Air Gasoline ....................... .507
Cleaning
Wheels ............................. .593
Climate Control ......................... .391
Clock ................................. .337
Cold Weather Operation ....................411
Compact Disc (CD) Maintenance ............. .390
Compact Spare Tire ....................... .487
Compass .............................. .315
Compass Calibration ...................... .318
Compass Variance ........................ .317
Computer, Trip/Travel ..................... .315 Connector
UCI ............................... .382
Universal Consumer Interface (UCI) ........ .382
Console ............................... .189
Console, Floor .......................... .189
Contract, Service ......................... .627
Coolant Pressure Cap (Radiator Cap) .......... .580
Cooling System .......................... .577
Adding Coolant (Antifreeze) .............. .579
Coolant Capacity ...................... .610
Coolant Level ........................ .581
Disposal of Used Coolant ................ .581
Drain, Flush, and Refill ................. .578
Inspection ........................... .577
Points to Remember .................... .581
Pressure Cap ......................... .580
Radiator Cap ......................... .580
Selection of Coolant (Antifreeze) ........... .578
Corrosion Protection ...................... .591636 INDEX

Oil Pressure Light ........................ .301
Onboard Diagnostic System ................. .562
Operating Precautions ..................... .562
Operator Manual (Owner’s Manual) .............6
Outside Rearview Mirrors ...................112
Overdrive .............................. .427
Overdrive OFF Switch ..................... .427
Overheating, Engine ...................... .305
Owner’s Manual (Operator Manual) .............6
Paint Care ............................. .591
Panic Alarm ..............................24
Parking Brake ........................... .452
Passing Light ........................... .170
Personal Settings ......................... .331
Pets ....................................98
Pets, Transporting ..........................98
Phone, Cellular ...........................114
Phone, Hands-Free (Uconnect™) ...............114 Placard, Tire and Loading Information ......... .478
Power
Door Locks ............................38
Inverter ............................. .186
Mirrors ..............................113
Steering ............................ .450
Windows .............................41
Pregnant Women and Seat Belts ................61
Preparation for Jacking .................... .542
Pretensioners
Seat Belts .............................59
Programmable Electronic Features ............ .331
Radial Ply Tires ......................... .485
Radiator Cap (Coolant Pressure Cap) .......... .580
Radio Operation ......................... .391
Rear Axle (Differential) .................... .590
Rear Swing Gate ...........................44
Rear Window Defroster .................... .294
10 INDEX 645