2008 JEEP GRAND CHEROKEE radiator cap

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 even-
tually poison you. To avoid breathing CO, refer to
Exhaust Gas in the Safety Tips section of this manual.
Cooling System
WARNING!
You or others can be badly burned by hot antifreeze/
coolant or steam from your radiator. If you see or hear
steam coming from under the hood, don't 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 antifreeze/coolant protection every 12 months
(before the onset of freezing weather, where applicable).
If antifreeze/coolant is dirty or rusty in appearance, the
system should be drained, flushed and refilled with fresh
antifreeze/coolant. Check the front of the A/C condenser
for any accumulation of bugs, leaves, etc. If dirty, clean by
gently spraying water from a garden hose vertically
down the face of the condenser.
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
coolant from the radiator drain cock. If the cap is sealing
properly, the antifreeze/coolant will begin to drain from
MAINTAINING YOUR VEHICLE 407
7

the coolant recovery bottle. DO NOT REMOVE THE
COOLANT PRESSURE CAP WHEN THE COOLING
SYSTEM IS HOT.
Cooling System Ð Drain, Flush, And Refill
At the intervals shown on the Maintenance Schedule, the
system should be drained, flushed and refilled.
If the solution 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 old
antifreeze/coolant solution.
Selection Of Coolant
Use only the manufacturer's recommended antifreeze/
coolant. Refer to Fluids, Lubricants, and Genuine Parts
for correct antifreeze/coolant type.
CAUTION!
Mixing of antifreeze/coolant other than the specified
HOAT antifreeze/coolant may result in engine dam-
age and may decrease corrosion protection. If a
non-HOAT antifreeze/coolant is introduced into the
cooling system in an emergency, it should be re-
placed with the specified antifreeze/coolant as soon
as possible.
Do not use plain water alone or alcohol base
antifreeze/coolant products. Do not use additional
rust inhibitors or antirust products, as they may not
be compatible with the antifreeze/coolant and may
plug the radiator.
This vehicle has not been designed for use with
Propylene Glycol based antifreeze/coolant. Use of
Propylene Glycol base antifreeze/coolant is not
recommended.
408 MAINTAINING YOUR VEHICLE

Adding Coolant
Your vehicle has been built with an improved antifreeze/
coolant that allows extended maintenance intervals. This
antifreeze/coolant can be used up to 5 Years or 100,000
miles (160 000 km) before replacement. To prevent reduc-
ing this extended maintenance period, it is important that
you use the same antifreeze/coolant throughout the life
of your vehicle. Please review these recommendations for
using Hybrid Organic Additive Technology (HOAT)
antifreeze/coolant.
When adding antifreeze/coolant:
²The manufacturer recommends using Mopart
Antifreeze/ Coolant 5 Year/100,000 Mile Formula
HOAT (Hybrid Organic Additive Technology)
²Mix a minimum solution of 50% HOAT engine coolant
and distilled water. Use higher concentrations (not to
exceed 70%) if temperatures below -34ÉF (-37ÉC) are
anticipated.
²Use only high purity water such as distilled or deion-
ized water when mixing the water/antifreeze (cool-
ant) 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.
NOTE:Mixing antifreeze/coolant types will decrease
the life of the antifreeze/coolant and will require more
frequent antifreeze/coolant changes.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of
antifreeze/coolant, and to insure that antifreeze/coolant
will return to the radiator from the coolant recovery tank.
MAINTAINING YOUR VEHICLE 409
7

The radiator normally remains completely full, so there is
not need to remove the radiator cap unless checking for
antifreeze/coolant freeze point or replacing antifreeze/
coolant. 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 antifreeze/coolant is needed to main-
tain 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 antifreeze/
coolant to enter the radiator.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.
²Do not overfill the coolant recovery bottle.
²Check antifreeze/coolant freeze point in the radiator
and in the coolant recovery bottle. If antifreeze/
coolant needs to be added, contents of coolant recov-
ery bottle must also be protected against freezing.
²If frequent antifreeze/coolant additions are required,
or if the level in the coolant recovery bottle does not
drop when the engine cools, the cooling system should
be pressure tested for leaks.
²Maintain antifreeze/coolant concentration at 50%
HOAT antifreeze/coolant (minimum) and distilled
water for proper corrosion protection of your engine
which contains aluminum components.
MAINTAINING YOUR VEHICLE 411
7

Fluid Type........................... 417
Special Additives...................... 417
Torque Converter...................... 291
Autostick............................. 287
Auxiliary Electrical Outlet (Power Outlet)...... 168
Auxiliary Power Outlet................... 168
Battery............................... 401
Emergency Starting..................... 378
Keyless Transmitter Replacement (RKE)....... 25
Saving Feature (Protection)............... 124
Belts, Drive............................ 398
Belts, Seat.............................. 37
Body Mechanism Lubrication............... 405
B-Pillar Location........................ 314
Brake Assist System...................... 140
Brake Control System, Electronic............. 138
Brake Fluid............................ 414
Brake System........................... 413Anti-Lock (ABS)....................138,305
Fluid Check.......................... 414
Hoses.............................. 413
Master Cylinder....................... 414
Parking............................. 304
Warning Light........................ 188
Brake/Transmission Interlock............... 285
Break-In Recommendations, New Vehicle........ 68
Bulb Replacement.....................434,435
Calibration, Compass..................... 205
Camera, Rear........................... 156
Capacities, Fluid........................ 440
Caps, Filler
Fuel................................ 346
Radiator (Coolant Pressure)............... 409
Car Washes............................ 422
Carbon Monoxide Warning...............69,340
Cargo Area Cover....................... 173
INDEX 471
10

Drain, Flush, and Refill.................. 408
Inspection........................... 407
Points to Remember.................... 411
Pressure Cap......................... 409
Radiator Cap......................... 409
Selection of Coolant (Antifreeze).........408,440
Crankcase Emission Control System.......... 400
Cruise Light........................... 194
Cup Holder............................ 171
Customer Assistance..................... 460
Data Recorder, Event...................... 56
Daytime Running Lights................... 127
Dealer Service.......................... 393
Defroster, Rear Window................... 178
Defroster, Windshield................70,259,266
Diagnostic System, Onboard................ 390
Diesel Engine Maintenance................. 449
Diesel Fuel............................ 344Diesel Fuel Requirements.................. 344
Digital Video Disc (DVD) Player............. 241
Dimmer Switch, Headlight................. 128
Dipsticks
Automatic Transmission................. 419
Oil (Engine).......................... 394
Power Steering........................ 403
Disabled Vehicle Towing................... 382
Disposal
Engine Oil........................... 397
Used Engine Fluids..................... 397
Door Locks............................. 28
Door Locks, Automatic.................... 29
Door Opener, Garage..................... 158
Drive Belts............................ 398
Driving............................... 299
Off-Pavement......................... 300
Off-Road............................ 300
DVD Player (Video Entertainment System)...... 254
INDEX 473
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