2012 JEEP GRAND CHEROKEE air condition

HAZARD WARNING FLASHERS
The Hazard Warning flasher switch is located on the
switch bank just above the climate controls.
Press the switch to turn on the Hazard Warning
flasher. When the switch is activated, all directional
turn signals will flash on and off to warn oncoming
traffic of an emergency. Press the switch a second time to
turn off the Hazard Warning flashers.
This is an emergency warning system and it should not
be used when the vehicle is in motion. Use it when your
vehicle is disabled and it is creating a safety hazard for
other motorists.
When you must leave the vehicle to seek assistance, the
Hazard Warning flashers will continue to operate even
though the ignition is placed in the OFF position.
NOTE:With extended use the Hazard Warning flashers
may wear down your battery.
IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
•On the highways — slow down.
•In city traffic — while stopped, place the transmission
in NEUTRAL, but do not increase the engine idle
speed.
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
460 WHAT TO DO IN EMERGENCIES

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.
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.
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.
JACKING AND TIRE CHANGING
Run Flat Tires
This vehicle is equipped with run flat tires. Although the
tires are designed with a “run flat” feature that allows the
vehicle to be driven approximately 50 miles (80 km) at
55 mph (88 km/h). immediate service should be ob-
tained.6
WHAT TO DO IN EMERGENCIES 461

MAINTAINING YOUR VEHICLE
CONTENTS
Engine Compartment — 6.4L............. 471
Onboard Diagnostic System – OBD II....... 472
▫Loose Fuel Filler Cap Message........... 472
Emissions Inspection And Maintenance
Programs............................ 473
Replacement Parts..................... 474
Dealer Service........................ 474
Maintenance Procedures................. 475
▫Engine Oil......................... 476▫Engine Oil Filter..................... 479
▫Engine Air Cleaner Filter............... 479
▫Maintenance-Free Battery.............. 480
▫Air Conditioner Maintenance............ 481
▫Body Lubrication.................... 482
▫Windshield Wiper Blades............... 483
▫Adding Washer Fluid................. 485
▫Exhaust System..................... 486
▫Cooling System..................... 489
7

WARNING! (Continued)
•Batteries contain sulfuric acid that can burn your
skin or eyes and generate hydrogen gas which is
flammable and explosive. Keep open flames or
sparks away from the battery.
•Do not allow vehicles to touch each other as this
could establish a ground connection and personal
injury could result.
•Do not connect the cable to the negative post (-) of
the discharged battery. The resulting electrical
spark could cause the battery to explode and could
result in personal injury.
Air Conditioner Maintenance
For best possible performance, your air conditioner
should be checked and serviced by an authorized dealer
at the start of each warm season. This service shouldinclude cleaning of the condenser fins and a performance
test. Drive belt tension should also be checked at this
time.
CAUTION!
Do not use chemical flushes in your air conditioning
system as the chemicals can damage your air condi-
tioning components. Such damage is not covered by
the New Vehicle Limited Warranty.
7
MAINTAINING YOUR VEHICLE 481

WARNING!
•Use only refrigerants and compressor lubricants
approved by the manufacturer for your air condi-
tioning system. Some unapproved refrigerants are
flammable and can explode, injuring you. Other
unapproved refrigerants or lubricants can cause
the system to fail, requiring costly repairs. Refer to
Warranty Information Book, located on the DVD,
for further warranty information.
•The air conditioning system contains refrigerant
under high pressure. To avoid risk of personal
injury or damage to the system, adding refrigerant
or any repair requiring lines to be disconnected
should be done by an experienced repairman.
NOTE:Use only manufacturer approved A/C System
Sealers, Stop Leak Products, Seal Conditioners, Compres-
sor Oil, or Refrigerants.
Refrigerant Recovery And Recycling
R-134a Air Conditioning Refrigerant is a hydrofluoro-
carbon (HFC) that is endorsed by the Environmental
Protection Agency and is an ozone-saving product. How-
ever, the manufacturer recommends that air conditioning
service be performed by dealers or other service facilities
using recovery and recycling equipment.
Body Lubrication
Locks and all body pivot points, including such items as
seat tracks, door hinge pivot points and rollers, liftgate,
tailgate, sliding doors and hood hinges, should be lubri-
cated periodically with a lithium based grease, such as
MOPARSpray White Lube or equivalent to assure
quiet, easy operation and to protect against rust and
wear. Prior to the application of any lubricant, the parts
concerned should be wiped clean to remove dust and
grit; after lubricating excess oil and grease should be
removed. Particular attention should also be given to
hood latching components to ensure proper function.
482 MAINTAINING YOUR VEHICLE

•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 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 coolant performance, poor gas mile-
age, and increased emissions.
Brake System
Fluid Level Check – Brake Master Cylinder
The fluid level in the master cylinder should be checked
whenever the vehicle is serviced, or immediately if the
brake system warning light is on. If necessary, add fluid
to bring level to the full mark on the side of the reservoir
of the brake master cylinder. Be sure to clean the top of
the master cylinder area before removing the cap. With
disc brakes, fluid level can be expected to fall as the brake
494 MAINTAINING YOUR VEHICLE

Cavity Cartridge
FuseMini
FuseDescription
M2 20 Amp
YellowElectronic Limit
Slip Differential/
Air Suspension
M3 20 Amp
YellowLiftgate/Headrest
M5 25 Amp
Natural115V AC Power
Inverter
M6 20 Amp
YellowCigar Lighter
M7 20 Amp
YellowPower Outlet #2
(Switchable)
M8 20 Amp
YellowFront Heated Seat
& Steering Wheel
M9 20 Amp
YellowRear Heated SeatsCavity Cartridge
FuseMini
FuseDescription
M10 15 Amp
BlueVideo/Universal
Garage Door
Opener
M11 10 Amp
RedHeating, Ventilation
& Air Conditioning
(Climate Control
System)
M12 30 Amp
GreenRadio/Amplifier
M13 20 Amp
YellowInstrument Cluster
M14 20 Amp
YellowBack Up Camera –
If Equipped
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MAINTAINING YOUR VEHICLE 507

•Anytime you store your vehicle, or keep it out of
service (i.e. vacation) for two weeks or more, run the
air conditioning system at idle for about five minutes
in the fresh air and high blower setting. This will
ensure adequate system lubrication to minimize the
possibility of compressor damage when the system is
started again.
REPLACEMENT BULBS
Interior Lights Bulb Type
Glove Box Lamp......................... 194
Grab Handle Lamp................L002825W5W
Overhead Console Reading Lamps.........VT4976
Rear Cargo Lamp.......................214–2
Visor Vanity Lamp.....................V26377
Underpanel Courtesy Lamps................ 906
Instrument Cluster (General Illumination)....... 103
Telltale/Hazard Lamp...................... 74Exterior Lights Bulb Type
Backup Lamps.........................3157K
Front Park/Turn Lamp...................3757A
Front Fog Lamps........................9145
Front Side Marker...................... W5W
Headlamps (Low Beam) – High Intensity Discharge
(HID)................................ D1S
(Serviced at Authorized Dealer)
Headlamps (Low Beam)...................9006
Headlamps (High Beam)..................9005
Rear Turn/Stop/Tail Lamps...............3157K
NOTE:Numbers refer to commercial bulb types that
can be purchased from your authorized dealer.
If a bulb needs to be replaced, visit your authorized
dealer or refer to the applicable Service Manual.
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MAINTAINING YOUR VEHICLE 511