2012 JEEP GRAND CHEROKEE radiator

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 for anyaccumulation 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
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.
592 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” for the proper
maintenance intervals.
Selection Of Coolant
Use only the manufacturer’s recommended engine cool-
ant (antifreeze). Refer to “Fluids, Lubricants, and Genu-
ine Parts” in “Maintaining Your Vehicle” for further
information.
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 engine coolant
(antifreeze) and may plug the radiator.
•This vehicle has not been designed for use with
Propylene Glycol-based engine coolant (anti-
freeze). Use of Propylene Glycol-based engine
coolant (antifreeze) is not recommended.
7
MAINTAINING YOUR VEHICLE 593

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 precau-
tion. 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 595

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 and children, do not store ethylene glycol-based
engine coolant (antifreeze) 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.
Coolant Level
The coolant bottle provides a quick visual method for
determining that the engine coolant (antifreeze) level is
adequate. With the engine idling, and warm to normal
operating temperature, 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.
596 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 recovery bottle.
•Check engine coolant (antifreeze) freeze point in the
radiator and in the coolant recovery bottle. If engine
coolant (antifreeze) needs to be added, contents of
coolant recovery bottle must also be protected against
freezing.
•If frequent engine coolant (antifreeze) 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.
•Maintain 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 periodically inspected.
Refer to the “Maintenance Schedule” for the proper
maintenance intervals.7
MAINTAINING YOUR VEHICLE 597

Cavity CartridgeFuseMini
Fuse Description
J18 20 Amp Blue Powertrain Control
Module/Powertrain
Control Module
Transmission Range
J19 60 Amp Yellow Radiator Fan Motor
HI/Radiator Fan
Motor Low
J20 30 Amp Pink Front Wiper
J21 20 Amp Blue Front/Rear Washer
Control
J22 25 Amp Natural Sunroof Module
M1 15 Amp BlueStop LampsCavity Cartridge
FuseMini
Fuse Description
M2 20 Amp YellowElectronic Limit
Slip Differential/
Air Suspension
M3 20 Amp
Yellow Liftgate/Headrest
M5 25 Amp
Natural 115V AC Power
Inverter
M6 20 Amp
Yellow Cigar Lighter
M7 20 Amp
Yellow Power Outlet #2
(Switchable)
M8 20 Amp
Yellow Front Heated Seat
& Steering Wheel
M9 20 Amp
Yellow Rear Heated Seats
612 MAINTAINING YOUR VEHICLE

Fluid Level Check................. 602,603
Fluid Type ......................... 601
Special Additives ..................... 602
Autostick ........................... 428,437
Auxiliary Electrical Outlet (Power Outlet) ...... 258
Auxiliary Power Outlet ................... 258
B-Pillar Location ........................ 483
Battery ............................... 583
Keyless Transmitter Replacement (RKE) ..... 27
Belts, Seat ............................ 52,96
Blind Spot Monitoring .................... 112
Body Mechanism Lubrication ............... 586
Brake Assist System ...................... 465
Brake Control System, Electronic ............. 464
Brake Fluid ............................ 598
Brake System ........................... 597
Anti-Lock (ABS) ..................... 464
Fluid Check ........................ 598 Master Cylinder
..................... 598
Parking ........................... 462
Warning Light ....................... 290
Brake/Transmission Interlock ............... 421
Break-In Recommendations, New Vehicle ........ 93
Bulb Replacement ..................... 616,617
Bulbs, Light ............................ 98
Calibration, Compass ..................... 319
Camera, Rear ........................... 237
Capacities, Fluid ........................ 622
Caps, Filler Fuel .............................. 517
Power Steering ...................... 461
Radiator (Coolant Pressure) ............. 595
Car Washes ............................ 605
Carbon Monoxide Warning ...............95,513
Cargo (Vehicle Loading) ................... 521
Cargo Area Cover ....................... 271
10
INDEX 657

Cooling System......................... 592
Adding Coolant (Antifreeze) ............. 594
Coolant Capacity ..................... 622
Coolant Level ....................... 596
Disposal of Used Coolant ............... 596
Drain, Flush, and Refill ................ 593
Inspection .......................... 592
Points to Remember .................. 596
Pressure Cap ........................ 595
Radiator Cap ....................... 595
Selection of Coolant (Antifreeze) .......593,622
Cruise Control (Speed Control) .............. 201
Cupholders ............................ 264
Customer Assistance ..................... 647
Data Recorder, Event ...................... 80
Daytime Running Lights ................... 183
Dealer Service .......................... 578 Defroster, Rear Window
................... 275
Defroster, Windshield ................96,396,403
Diagnostic System, Onboard ................ 575
Dipsticks Automatic Transmission ................ 603
Oil (Engine) ........................ 579
Power Steering ...................... 461
Disabled Vehicle Towing ................... 566
Disposal Engine Oil ......................... 582
Used Engine Fluids ................... 582
Door Locks ............................. 33
Door Locks, Automatic .................... 35
Door Opener, Garage ..................... 242
Driving ............................... 453
Off-Pavement ....................... 454
Off-Road .......................... 454
Driving to Achieve Maximum Fuel Economy .... 311
10
INDEX 659