cooling JEEP WRANGLER 2009 JK / 3.G 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 (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.
416 MAINTAINING YOUR VEHICLE

Cooling System — Drain, Flush, and Refill
If the engine coolant (antifreeze) is dirty and contains a
considerable amount of sediment, clean and flush with
reliable cooling system cleaner. Follow with a thorough
rinsing to remove all deposits and chemicals. Properly
dispose of the old engine coolant (antifreeze).
Refer to the “Maintenance Schedule” in Section 8 for the
proper maintenance intervals.
Selection Of Engine Coolant
Use only the manufacturer’s recommended engine cool-
ant (antifreeze). Refer to “Fluids, Lubricants, and Genu-
ine Parts” in this section for the correct fluid type.
CAUTION!
•Mixing of engine coolant (antifreeze) other than
the specified HOAT engine coolant (antifreeze)
may result in engine damage and may decrease
corrosion protection. If a non-HOAT engine cool-
ant (antifreeze) is introduced into the cooling
system in an emergency, it should be replaced with
the specified engine coolant (antifreeze) as soon as
possible.
•Do not use water alone or alcohol-based engine
coolant (antifreeze) products. Do not use addi-
tional rust inhibitors or antirust products, as they
may not be compatible with the antifreeze/engine
coolant (antifreeze) and may plug the radiator.(Continued)
7
MAINTAINING YOUR VEHICLE 417

CAUTION! (Continued)
•This vehicle has not been designed for use with
Propylene Glycol based engine coolant (anti-
freeze). Use of Propylene Glycol base engine cool-
ant (antifreeze) is not recommended.
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 5 Years or 102,000 miles (170 000 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 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
(antifreeze) and distilled water. Use higher concentra-
tions (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.
418 MAINTAINING YOUR VEHICLE

NOTE:Mixing engine coolant (antifreeze) types will
decrease the life of the engine coolant (antifreeze) and
will require more frequent engine coolant (antifreeze)
changes.
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
7
MAINTAINING YOUR VEHICLE 419

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.
•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” in Section 8 for the
proper maintenance intervals.
WARNING!
Riding the brakes can lead to brake failure and
possibly an accident. 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.7
MAINTAINING YOUR VEHICLE 421

FLUID CAPACITIES
U.S.Metric
Fuel (Approximate) — Two Door Models 18.5 Gallons 70 Liters
Fuel (Approximate) — Four Door Models 22.5 Gallons 85 Liters
Engine Oil with Filter
3.8 Liter Engine 6 Quarts 5.7 Liters
Cooling System *
3.8 Liter Engine (MOPAR Antifreeze/Engine Coolant 5
Year/100,000 Mile Formula or equivalent) 13 Quarts
12 Liters
* Includes coolant recovery bottle filled to MAX level.
7
MAINTAINING YOUR VEHICLE 447

Child Seat.............................. 65
Climate Control ......................... 264
Clock ........................ 220,234,238,247
Compact Disc (CD) Maintenance ............. 263
Compass .............................. 213
Compass Calibration ..................... 215
Computer, Trip/Travel .................212,213
Console .............................. 109
Console, Floor .......................... 109
Contract, Service ........................ 475
Cooling System ......................... 416
Adding Coolant (Antifreeze) .............. 418
Coolant Capacity ...................... 447
Coolant Level ......................... 420
Disposal of Used Coolant ................ 419
Drain, Flush, and Refill .................. 417
Inspection ........................... 416
Points to Remember .................... 420
Pressure Cap ......................... 419 Selection of Coolant (Antifreeze)
.........417,447
Corrosion Protection ..................... 428
Cruise Light ........................... 205
Cupholders ............................ 108
Customer Assistance ..................... 473
Data Recorder, Event ...................... 59
Daytime Running Lights ................... 97
Dealer Service .......................... 405
Defroster, Rear Window ................... 193
Defroster, Windshield ................76,265,267
Delay (Intermittent) Wipers ................. 100
Diagnostic System, Onboard ................ 402
Dimmer Switch, Headlight .................. 96
Dipsticks Oil (Engine) .......................... 406
Power Steering ........................ 314
Disabled Vehicle Towing ................... 397
Disarming, Theft System ................... 18
484 INDEX

Inflation Pressures..................... 343
Jacking ........................... 389,392
Load Capacity ..................... 338,339
Pressure Monitor System (TPMS) ........... 351
Pressure Warning Light .................. 206
Quality Grading ....................... 479
Radial .............................. 346
Replacement ......................... 348
Rotation ............................ 350
Safety .............................. 333
Sizes ............................... 335
Spare Tire ........................... 390
Spinning ............................ 346
Tread Wear Indicators ................... 347
To Open Hood .......................... 93
Tongue Weight/Trailer Weight .............. 375
Torque Converter Clutch .................. 291
Tow Hooks, Emergency ................... 396
Towing ............................ 365,397Disabled Vehicle
....................... 397
Guide .............................. 369
Recreational .......................... 382
Weight .............................. 369
Trac-Lok Rear Axle ...................... 295
Traction Control ......................... 319
Traction Control Light .................... 211
Trailer Sway Control (TSC) ................. 332
Trailer Towing .......................... 365
Cooling System Tips .................... 382
Hitches .......................... 356,368
Minimum Requirements ................. 376
Trailer and Tongue Weight ............... 375
Wiring .............................. 380
Trailer Towing Guide ..................... 369
Trailer Weight .......................... 369
Transfer Case ........................... 426
Four-Wheel-Drive Operation .............. 291
Maintenance ......................... 426
496 INDEX