2008 JEEP GRAND CHEROKEE engine overheat

WHAT TO DO IN EMERGENCIES
CONTENTS
mHazard Warning Flashers.................370
mIf Your Engine Overheats.................371
mJacking And Tire Changing................372
NJack Location........................372
NSpare Tire Stowage....................373
NSpare Tire Removal....................373
NPreparations For Jacking................374NJacking Instructions....................375
mJump Starting.........................378
mEmergency Tow Hooks Ð If Equipped........381
mTowing A Disabled Vehicle................382
N2WD Models Only....................382
N4WD Models Only....................382
6

IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
²On the highways Ð Slow down.
²In city traffic Ð While stopped, put transmission in N
(Neutral), but do not increase engine idle speed.
NOTE:There are steps that you can take to slow down
an impending overheat condition. If your air conditioner
is on, turn it off. The air conditioning system adds heat to
the engine cooling system and turning off the A/C
removes this heat. You can also turn the Temperature
Control to maximum heat, the Mode Control to floor, and
the Fan Control 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 ªHº,
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
the ªHº, and you hear continuous chimes, turn the
engine off immediately, and call for service.
WHAT TO DO IN EMERGENCIES 371
6

WARNING!
The air induction system (air cleaner, hoses, etc) can
provide a measure of protection in the case of engine
backfire. Do not remove the air induction system (air
cleaner, hoses, etc) unless such removal is necessary
for repair or maintenance. Make sure that no one is
near the engine compartment before starting the
vehicle with the air induction system (air cleaner,
hoses, etc) removed. Failure to do so can result in
serious personal injury.
Catalytic Converter
The catalytic converter requires the use of unleaded fuel
only. Leaded gasoline will destroy the effectiveness of the
converter as an emission control device.Under normal operating conditions, the catalytic con-
verter will not require maintenance. However, it is im-
portant to keep the engine properly tuned to assure
proper catalyst operation and prevent possible catalyst
damage.
CAUTION!
Damage to the catalytic converter can result if your
vehicle is not kept in proper operating condition. In
the event of engine malfunction, particularly involv-
ing engine misfire or other apparent loss of perfor-
mance, have your vehicle serviced promptly. Contin-
ued operation of your vehicle with a severe
malfunction could cause the converter to overheat,
resulting in possible damage to the converter and
vehicle.
MAINTAINING YOUR VEHICLE 399
7

NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your exhaust
system. Do not park or operate your vehicle in areas
where your exhaust system can contact anything that
can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may suggest severe
and abnormal catalyst overheating. If this occurs, stop
the vehicle, turn off the engine and allow it to cool.
Service, including a tune up to manufacturer's specifica-
tions, should be obtained immediately.
To minimize the possibility of catalytic converter damage:
²Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
²Do not try to start the engine by pushing or towing the
vehicle.
²Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing, or for prolonged periods during very rough
idle or malfunctioning operating conditions.
Crankcase Emission Control System
Proper operation of this system depends on freedom
from sticking or plugging due to deposits. As vehicle
mileage builds up, the PCV valve and passages may
accumulate deposits. If a valve is not working properly,
replace it with a new valve. DO NOT ATTEMPT TO
CLEAN THE OLD PCV VALVE!
400 MAINTAINING YOUR VEHICLE

The cap should be inspected and cleaned if there is any
accumulation of foreign material on the sealing surfaces.
WARNING!
²The warning words DO NOT OPEN HOT on the
cooling system pressure cap are a safety precau-
tion. Never add antifreeze/coolant 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.
²Do not use a pressure cap other than the one
specified for your vehicle. Personal injury or en-
gine damage may result.
Disposal of Used Engine Coolant
Used ethylene glycol-based antifreeze/coolant is a regu-
lated substance requiring proper disposal. Check with
your local authorities to determine the disposal rules for
your community. To prevent ingestion by animals and
children, do not store ethylene glycol-based antifreeze/
coolant in open containers or allow it to remain in
puddles on the ground. If ingested by a child, contact a
physician immediately. Clean up any ground spills im-
mediately.
Coolant Level
The coolant bottle provides a quick visual method for
determining that the antifreeze/coolant level is adequate.
With the engine idling, and warm to normal operating
temperature, the level of the antifreeze/coolant in the
bottle should be between the ranges indicated on the
bottle.
410 MAINTAINING YOUR VEHICLE

Oil Selection.......................395,440
Oil Synthetic......................... 397
Overheating.......................... 371
Starting............................. 275
Temperature Gauge..................... 192
Engine Oil Viscosity...................... 396
Engine Oil Viscosity Chart................. 396
Enhanced Accident Response Feature.......... 54
Entry System, Illuminated.................. 21
Event Data Recorder...................... 56
Exhaust Gas Caution................69,340,407
Exhaust System......................... 406
Exterior Finish Care...................... 422
Fabric Care............................ 423
Filters
Air Cleaner.......................... 398
Engine Oil........................... 397
Engine Oil Disposal.................... 397Finish Care............................ 422
Flashers.............................. 370
Hazard Warning....................... 370
Turn Signal.....................188,437,438
Flexible Fuel Vehicles
Cruising Range........................ 343
Engine Oil........................... 343
Fuel Requirements..................340,342
Replacement Parts..................... 343
Starting............................. 343
Flipper Glass, Liftgate..................... 35
Flooded Engine Starting................... 277
Fluid Capacities......................... 440
Fluid Leaks............................. 70
Fluid Level Checks
Automatic Transmission............417,418,419
Brake............................... 414
Engine Oil........................... 394
Power Steering........................ 403
INDEX 475
10

Identification Logo..................... 395
Materials Added to..................... 397
Pressure Warning Light.................. 190
Recommendation...................395,440
Synthetic............................ 397
Viscosity..........................396,440
Onboard Diagnostic System..............390,391
Opener, Garage Door (HomeLinkt) ........... 158
Outside Rearview Mirrors.................. 78
Overdrive............................. 288
Overdrive OFF Switch.................... 288
Overhead Console....................... 157
Overheating, Engine...................193,371
Owner's Manual (Operator Manual).......... 464
Paint Care............................. 421
Paint Damage.......................... 421
Panic Alarm............................ 24
Park Sense System, Rear................... 152Parking Brake.......................... 304
Passing Light........................... 128
Pedals, Adjustable....................... 134
Personal Settings........................ 206
Pets.................................. 67
Pets, Transporting........................ 67
Phone, Cellular.......................... 81
Phone, Hands-Free (UConnectŸ)............. 81
Placard, Tire and Loading Information......... 314
Polishing and Waxing..................... 422
Port
Universal Serial Bus (USB)................ 241
USB ................................ 241
Power
Distribution Center (Fuses)............... 429
Door Locks........................... 28
Inverter............................. 169
Mirrors.............................. 79
Outlet (Auxiliary Electrical Outlet).......... 168
482 INDEX

INTRODUCTION INTRODUCTION ROLLOVER WARNING HOW TO USE THIS MANUAL WARNINGS AND CAUTIONS VEHICLE IDENTIFICATION NUMBER VEHICLE MODIFICATIONS/ALTERATIONS THINGS TO KNOW BEFORE STARTING YOUR VEHICLE A WORD
ABOUT YOUR KEYS Wireless Ignition Node (WIN)Fob with Integrated Key (FOBIK)Ignition Key RemovalKey-In-Ignition ReminderSENTRY KEY Replacement KeysCustomer Key (Fob) ProgrammingGeneral InformationSECURITY ALARM SYSTEM - IF EQUIPPED To Set
the AlarmTo Disarm the SystemILLUMINATED ENTRY REMOTE KEYLESS ENTRY To Unlock the DoorsTo Lock the DoorsTo Release the Liftgate Flipper GlassUsing The Panic AlarmProgramming Additional TransmittersTransmitter Battery ServiceGeneral Information
REMOTE STARTING SYSTEM - IF EQUIPPED DOOR LOCKS Manual Door LocksPower Door LocksChild Protection Door LockWINDOWS Power WindowsWind BuffetingLIFTGATE Liftgate Flipper GlassOCCUPANT RESTRAINTS Lap/Shoulder BeltsLap/Shoulder Belt
Operating InstructionsAdjustable Upper Shoulder Belt AnchorageAutomatic Locking Mode - If EquippedEnergy Management FeatureSeat Belt PretensionersEnhanced Seat Belt Use Reminder System (BeltAlert)Seat Belts and Pregnant WomenSeat Belt ExtenderDriver And
Front Passenger Supplemental Restraint Systems (SRS) Child RestraintENGINE BREAK-IN RECOMMENDATIONS SAFETY TIPS Exhaust GasSafety Checks You Should Make Inside The VehicleSafety Checks You Should Make Outside The VehicleUNDERSTANDING
THE FEATURES OF YOUR VEHICLE MIRRORS Inside Day/Night MirrorAutomatic Dimming Mirror - If EquippedOutside MirrorsExterior Mirrors Folding FeatureDrivers and Front Passenger Outside Automatic Dimming Mirror - If EquippedPower Remote Control Mirrors
- If EquippedHeated Remote Control Mirrors - If EquippedLighted Vanity Mirrors - If EquippedHANDS-FREE COMMUNICATION (UConnect) - IF EQUIPPED OperationPhone Call FeaturesUConnect System FeaturesAdvanced Phone ConnectivityThings You Should Know
About Your UConnect SystemGeneral InformationSEATS Front Manual Seat AdjustmentFront Seat Adjustment - ReclineManual Lumbar Support Adjustment8 - Way Drivers Power Seat4 - Way Passengers Power Seat - If EquippedHead RestraintsFront Heated Seats-If
EquippedRear Heated Seats - If Equipped60/40 Split Rear SeatDRIVER MEMORY SEAT - IF EQUIPPED Setting Memory Positions and Linking Remote Keyless Entry Transmitter to MemoryMemory Position RecallTo Disable A Transmitter Linked to MemoryEasy Entry/Exit
SeatTO OPEN AND CLOSE THE HOOD LIGHTS Multi-Function Control LeverBattery Saver Feature-Exterior/Interior LightsHeadlights and Parking LightsAutomatic Headlight System - If EquippedSmartBeams - If EquippedInstrument Panel and Interior LightsDaytime Running
Lights - If EquippedAutomatic Headlight Leveling - HID Headlights OnlyLights-On ReminderFog Lights - If EquippedTurn SignalsHigh Beam SwitchPassing LightHeadlight Time DelayInterior LightsFront Map/Reading LightsWINDSHIELD WIPERS AND WASHERS MistSpeed
Sensitive Intermittent Wiper SystemRain Sensing Wipers-If EquippedTILT/TELESCOPING STEERING COLUMN ADJUSTABLE PEDALS - IF EQUIPPED ELECTRONICSPEED CONTROL - IF EQUIPPED Electronic Speed Control OperationTo ActivateTo Set At A Desired
SpeedTo DeactivateTo Resume SpeedTo Vary The Speed SettingTo Accelerate For PassingELECTRONIC BRAKE CONTROL SYSTEM ABS (Anti-Lock Brake System)TCS (Traction Control System)BAS (Brake Assist System)ERM (Electronic Roll Mitigation)ESP (Electronic
Stability Program)TSC (Trailer Sway Control)HSA (Hill Start Assist) (4WD Models with NV245 Two-Speed Transfer Case Only)HDC (Hill Descent Control) (4WD Models with NV245 Two-Speed Transfer Case Only)ESP/BAS Warning Lamp and ESP/TCS Indicator LightREAR
PARK ASSIST SYSTEM- IF EQUIPPED Rear Park Assist SensorsRear Park Assist Warning DisplayEnable/Disable the Rear Park Assist SystemService the RearPark Assist SystemCleaning the Rear Park Assist SystemREAR CAMERA - IF EQUIPPED Turning the Rear
Camera OnTurning the Rear Camera OffOVERHEAD CONSOLE Courtesy/Reading LightsSunglasses StorageGARAGE DOOR OPENER - IF EQUIPPED Programming HomeLinkGate Operator/Canadian ProgrammingUsing HomeLinkReprogramming a Single HomeLink
ButtonSecurityTroubleshooting TipsGeneral InformationPOWER SUNROOF - IF EQUIPPED Opening Sunroof - ExpressClosing Sunroof - ExpressPinch Protect FeaturePinch Protect OverrideVenting Sunroof - ExpressSunshade OperationWind BuffetingSunroof Maintenance
Ignition Off OperationSunroof Fully ClosedPOWER OUTLETS Front Power OutletRear Power Outlet - If EquippedPOWER INVERTER - IF EQUIPPED CUP HOLDERS CARGO AREA FEATURES Cargo LightRear Storage CompartmentRetractable Cargo Area Cover - If
EquippedCargo Tie-Down HooksCargo Load FloorREAR WINDOW FEATURES Rear Window Wiper/Washer - If EquippedRear Window Defroster - If EquippedROOF LUGGAGE RACK - IF EQUIPPED UNDERSTANDING YOUR INSTRUMENT PANEL INSTRUMENT PANEL
AND CONTROLS INSTRUMENT CLUSTER Gasoline Engine Diesel Engine INSTRUMENT CLUSTER DESCRIPTION ELECTRONIC VEHICLE INFORMATION CENTER (EVIC) Electronic Vehicle Information Center (EVIC) DisplaysEngine Oil Change Indicator System
Trip FunctionsCompass DisplayPersonal Settings (Customer Programmable Features)System StatusRADIO GENERAL INFORMATION Radio Broadcast SignalsTwo Types of SignalsElectrical DisturbancesAM ReceptionFM ReceptionSALES CODE REQ - AM/FM STEREO
RADIO AND 6-DISC CD/DVD CHANGER (MP3/WMA AUX JACK) Operating Instructions - Radio ModeOperation Instructions - (DISC MODE for CD and MP3/WMA Audio Play, DVD-VIDEO)Notes On Playing MP3/WMA FilesLIST Button (DISC Mode for MP3/WMA Play)
INFO Button (DISC Mode for MP3/WMA Play)SALES CODE RES - AM/FM STEREO RADIO WITH CD PLAYER (MP3 AUX JACK) Operating Instructions - Radio ModeOperationInstructions - CD MODE for CD and MP3 Audio PlayNotes On Playing MP3 FilesLIST Button
(CD Mode for MP3 Play)INFO Button (CD Mode for MP3 Play)SALES CODE REN - MULTIMEDIA SYSTEM - IF EQUIPPED Operating Instructions - Satellite Radio (If Equipped)Operating Instructions - Hands-Free Communication (UConnect) (If Equipped)Clock Setting
ProcedureSALES CODE RER - AM/FM/CD/DVD RADIO WITH NAVIGATION SYSTEM - IF EQUIPPED Operating Instructions - Satellite RadioClock Setting ProcedureUNIVERSAL CONSUMER INTERFACE (UCI) - IF EQUIPPED Connecting the iPodControlling the iPod
using Radio ButtonsPlay ModeList or Browse ModeSATELLITE RADIO (RSC) - IF EQUIPPED (REQ AND RES RADIOS ONLY) System ActivationElectronic Serial Number/Sirius Identification Number (ENS/SID)Selecting Satellite ModeSatellite AntennaReception Quality
Operating Instructions - Satellite ModeOperating Instructions - Hands Free Phone (If Equipped)Operating Instructions - Video Entertainment System (VES) (If Equipped)VIDEO ENTERTAINMENT SYSTEM (SALES CODE XRV) - IF EQUIPPED REMOTE SOUND SYSTEM
CONTROLS - IF EQUIPPED Radio OperationCD PlayerCD/DVD DISC MAINTENANCE RADIO OPERATION AND CELLULAR PHONES CLIMATE CONTROLS Manual Air Conditioning and Heating System - If EquippedAutomatic Temperature Control - If EquippedOperating
TipsOperating Tips Chart STARTING AND OPERATING STARTING PROCEDURE Normal Starting - Gasoline EnginesExtremely Cold Weather (below -20 degrees F or -29 degrees C)If Engine Fails to StartAfter StartingNormal Starting - Diesel EnginesENGINE BLOCK
HEATER - IF EQUIPPED AUTOMATIC TRANSMISSION Shift Lock Manual Override - If EquippedBrake/Transmission Interlock System5-Speed Automatic TransmissionGear RangesRocking the VehicleFOUR-WHEEL DRIVE OPERATION Quadra-Trac I Operating
Instructions/Precautions - If EquippedQuadra-Trac II Operating Instructions/Precautions - If EquippedShift PositionsShifting ProceduresQuadra-Drive II System - If EquippedON-ROAD DRIVING TIPS OFF-ROAD DRIVING TIPS When To Use 4WD LOW Range - If Equipped
Driving Through WaterDriving In Snow, Mud and SandHill ClimbingTraction DownhillAfter Driving Off-RoadPARKING BRAKE ANTI-LOCK BRAKE SYSTEM POWER STEERING MULTI DISPLACEMENT SYSTEM (MDS) - 5.7L Engine Only TIRE SAFETY INFORMATION
Tire Markings Tire Identification Number (TIN)Tire Loading and Tire PressureTIRES - GENERAL INFORMATION Tire PressureTire Inflation PressuresTire Pressures for High Speed OperationRadial-Ply TiresTire SpinningTread Wear IndicatorsLife of TireReplacement Tires
Alignment and BalanceTIRE CHAINS TIRE ROTATION RECOMMENDATIONS TIRE PRESSURE MONITOR SYSTEM (TPMS) Base System - If EquippedPremium System - If EquippedGeneral InformationFUEL REQUIREMENTS 3.7/4.7L Engines (If Equipped)5.7L Engines
(If Equipped)Reformulated GasolineGasoline/Oxygenate BlendsMMT In GasolineMaterials Added To FuelFuel System CautionsCarbon Monoxide WarningsFLEXIBLE FUEL (4.7L ENGINE ONLY) - IF EQUIPPED E-85 General InformationETHANOL FUEL (E-85)Fuel
RequirementsSelection Of Engine Oil For Flexible Fuel Vehicles (E-85) and Gasoline VehiclesStartingCruising RangeReplacement PartsFUEL REQUIREMENTS (DIESEL ENGINES) ADDING FUEL Fuel Filler Cap (Gas Cap)VEHICLE LOADING Certification LabelTRAILER
TOWING Common Towing DefinitionsTrailer Hitch ClassificationTrailer Towing Weights (Maximum Trailer Weight Ratings)Trailer and Tongue WeightTowing RequirementsTowing TipsRECREATIONAL TOWING (BEHIND MOTORHOME, ETC.) Towing - 2WD ModelsTowing
- Quadra-Trac I (Single-Speed Transfer Case) 4WD ModelsTowing - Quadra-Trac II /Quadra-Drive II 4WD ModelsSNOW PLOW WHAT TO DO IN EMERGENCIES HAZARDWARNING FLASHERS IF YOUR ENGINE OVERHEATS JACKING AND TIRE CHANGING Jack
LocationSpare Tire StowageSpare Tire RemovalPreparations For JackingJacking InstructionsJUMP STARTING EMERGENCY TOW HOOKS - IF EQUIPPED TOWINGA DISABLED VEHICLE 2WD Models Only4WD Models OnlyMAINTAINING YOUR VEHICLE ENGINE
COMPARTMENT - 3.7L ENGINE COMPARTMENT - 4.7L ENGINE COMPARTMENT - 5.7L ENGINE COMPARTMENT - 3.0L DIESEL ONBOARD DIAGNOSTIC SYSTEM - OBD II Loose Fuel Filler Cap MessageEMISSIONS INSPECTION AND MAINTENANCE PROGRAMS
REPLACEMENT PARTS DEALER SERVICE MAINTENANCE PROCEDURES Engine OilDrive Belts - Check Condition and TensionSpark PlugsSpark Plug WiresEngine AirCleaner FilterCatalytic ConverterCrankcase Emission Control SystemMaintenance-Free BatteryAir
Conditioner MaintenancePower Steering Fluid CheckBody LubricationWindshield Wiper BladesWindshield Washers - Front and RearExhaust SystemCooling SystemHoses and Vacuum/Vapor HarnessesFuel System ConnectionsBrake SystemFront/Rear Axle FluidTransfer
CaseAutomatic TransmissionMaintenance After Off-Road DrivingAppearance Care And Protection From CorrosionFUSE PANEL Interior FusesUnderhoodFuses (Power Distribution Center) Underhood Fuses (Integrated Power Module) VEHICLE STORAGE REPLACEMENT
BULBS BULB REPLACEMENT High Intensity Discharge Headlights (HID) - If EquippedHead LightFront Turn SignalFront Fog LightRear Tail, Stop, Turn Signal, and Back-Up LightsCenter High Mounted Stop Light (CHMSL)FLUIDS AND CAPACITIES FLUIDS, LUBRICANTS,
AND GENUINE PARTS EngineChassisMAINTENANCE SCHEDULES EMISSION CONTROL SYSTEM MAINTENANCE MAINTENANCE SCHEDULE - GASOLINE ENGINES Required Maintenance IntervalsMAINTENANCE SCHEDULES - DIESEL ENGINE Schedule B
- Diesel EngineSchedule A - Diesel EngineIF YOU NEED CONSUMER ASSISTANCE SUGGESTIONS FOR OBTAINING SERVICE FOR YOUR VEHICLE Prepare For The AppointmentPrepare A ListBe Reasonable With RequestsIF YOU NEED ASSISTANCE WARRANTY
INFORMATION (U.S. Vehicles Only) MOPAR PARTS REPORTING SAFETY DEFECTS In CanadaPUBLICATION ORDER FORMS DEPARTMENT OF TRANSPORTATION UNIFORM TIREQUALITY GRADES TreadwearTraction GradesTemperature GradesINDEX