cooling JEEP WRANGLER UNLIMITED 2013 User Guide

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

Cooling System – Drain, Flush, And Refill
If the engine coolant (antifreeze) is dirty or contains a
considerable amount of sediment, clean and flush with a
reliable cooling system cleaner. Follow with a thorough
rinsing to remove all deposits and chemicals. Properly
dispose of the old engine coolant (antifreeze) solution.
Refer to the “Maintenance Schedule” for the proper
maintenance intervals.
Selection Of Coolant
Refer to “Fluids, Lubricants, and Genuine Parts” in
“Maintaining Your Vehicle” for further information. CAUTION!• Mixing of engine coolant (antifreeze) other than
specified Organic Additive Technology (OAT) en-
gine coolant (antifreeze), may result in engine
damage and may decrease corrosion protection.
Organic Additive Technology (OAT) engine cool-
ant is different and should not be mixed with
Hybrid Organic Additive Technology (HOAT) en-
gine coolant (antifreeze). If a non-OAT engine
coolant (antifreeze) is introduced into the cooling
system in an emergency, it should be replaced with
the specified engine coolant (antifreeze) as soon as
possible. (Continued)578 MAINTAINING YOUR VEHICLE

CAUTION! (Continued)• Do not use water alone or alcohol-based engine
coolant (antifreeze) products. Do not use additional
rust inhibitors or antirust products, as they may not
be compatible with the radiator engine coolant and
may plug the radiator.
• This vehicle has not been designed for use with
propylene glycol-based engine coolant (antifreeze).
Use of propylene glycol-based engine coolant (an-
tifreeze) is not recommended.
Adding 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 ten years or 150,000 miles (240,000 km) before replace-
ment. To prevent reducing this extended maintenance period, it is important that you use the same engine
coolant (antifreeze) throughout the life of your vehicle.
Please review these recommendations for using Organic
Additive Technology (OAT) engine coolant (antifreeze).
When adding engine coolant (antifreeze):
• The manufacturer recommends using MOPAR 
Antifreeze/Coolant 10 Year/150,000 Mile Formula
OAT (Organic Additive Technology) or equivalent.
• Mix a minimum solution of 50% OAT 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.
7 MAINTAINING YOUR VEHICLE 579

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

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 expansion bottle.
• Check the coolant freeze point in the radiator and in
the coolant expansion bottle. If engine coolant (anti-
freeze) needs to be added, the contents of the coolant
expansion bottle must also be protected against
freezing.
• If frequent engine coolant (antifreeze) additions are
required, the cooling system should be pressure tested
for leaks. • Maintain engine coolant (antifreeze) concentration at
50% OAT engine coolant (antifreeze) (minimum) and
distilled water for proper corrosion protection of your
engine which contains aluminum components.
• Make sure that the coolant expansion bottle overflow
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 engine coolant (antifreeze)
performance, poor gas mileage, and increased emis-
sions.582 MAINTAINING YOUR VEHICLE

FLUID CAPACITIES
U.S. Metric
Fuel (Approximate) — Two Door Models 18.6 Gallons 70 Liters
Fuel (Approximate) — Four Door Models 22.5 Gallons 85 Liters
Engine Oil with Filter
3.6L Engine 6 Quarts 5.6 Liters
Cooling System *
3.6L Engine (MOPAR  Antifreeze/Engine Coolant
10 Year/152,000 Mile Formula or equivalent) 10.5 Quarts 9.9 Liters
* Includes coolant recovery bottle filled to MAX level. 610 MAINTAINING YOUR VEHICLE

Once A Month Or Before A Long Trip:
• Check engine oil level
• Check windshield washer fluid level
• Check the tire inflation pressures and look for unusual
wear or damage
• Check the fluid levels of the coolant reservoir, brake
master cylinder, power steering and transmission as
needed
• Check function of all interior and exterior lights
Required Maintenance Intervals .
Refer to the maintenance schedules on the following
page for the required maintenance intervals. At Every Oil Change Interval As Indicated By Oil
Change Indicator System:
• Change oil and filter
• Rotate the tires. Rotate at the first sign of irregu-
lar wear, even if it occurs before the oil indicator
system turns on.
• Inspect battery and clean and tighten terminals as
required
• Inspect automatic transmission fluid if equipped
with dipstick
• Inspect brake pads, shoes, rotors, drums, hoses
and park brake
• Inspect engine cooling system protection and
hoses
• Inspect exhaust system
• Inspect engine air cleaner if using in dusty or
off-road conditions
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SMAINTENANCE SCHEDULES 615

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

Emergency Brake ........................ .452
Emergency, In Case of
Jacking ............................. .540
Jump Starting ........................ .548
Tow Hooks .......................... .554
Emission Control System Maintenance ......... .563
Engine
Air Cleaner .......................... .569
Block Heater ......................... .413
Break-In Recommendations ................98
Compartment ........................ .561
Compartment Identification .............. .561
Cooling ............................. .577
Exhaust Gas Caution ................... .100
Fails to Start ..........................411
Flooded, Starting .......................411
Fuel Requirements ..................... .506
Jump Starting ........................ .548
Oil ................................ .566 Oil Change Interval .................... .325
Oil Selection ......................... .567
Oil Synthetic ......................... .568
Overheating ......................... .538
Starting ............................. .410
Temperature Gauge .................... .305
Engine Oil Viscosity ...................... .568
Engine Oil Viscosity Chart .................. .568
Enhanced Accident Response Feature ............70
Entry System, Illuminated ....................21
Ethanol ............................... .507
Event Data Recorder ........................75
Exhaust Gas Caution ...................... .100
Exhaust System .......................... .100
Extender, Seat Belt .........................61
Exterior Lights .......................... .103
Fabric Care ............................. .594
Fabric Top ............................. .595638 INDEX

Recreational ......................... .532
Weight ............................. .519
Towing Assistance ........................ .130
Trac-Lok Rear Axle ....................... .432
Traction Control ......................... .457
Trailer Sway Control (TSC) ................. .469
Trailer Towing .......................... .515
Cooling System Tips ................... .531
Hitches ............................. .518
Minimum Requirements ................. .525
Trailer and Tongue Weight ............... .524
Wiring ............................. .529
Trailer Towing Guide ...................... .519
Trailer Weight ........................... .519
Transfer Case ........................... .589
Four-Wheel-Drive Operation .............. .428
Maintenance ......................... .589
Transmission ........................... .585
Automatic ........................... .420 Manual ............................. .414
Range Indicator ....................... .306
Shifting ............................. .418
Transmitter Battery Service
(Remote Keyless Entry) ....................27
Tread Wear Indicators ..................... .490
Trip Computer .......................... .315
Trip Odometer .......................... .308
Trip Odometer Reset Button ................. .306
Turn Signals ............................ .169
UCI Connector .......................... .382
Uconnect™ (Hands-Free Phone) ...............114
Uniform Tire Quality Grades ................ .631
Universal Consumer Interface (UCI) Connector . . . .382
Unleaded Gasoline ....................... .506
Untwisting Procedure, Seat Belt ................55
Upholstery Care ......................... .594650 INDEX