2010 JEEP GRAND CHEROKEE engine overheat

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.
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
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.
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.
6
WHAT TO DO IN EMERGENCIES 347

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
eventually poison you. To avoid breathing CO, refer
to “Safety Tips/Exhaust Gas” in “Things To Know
Before Starting Your Vehicle” for further informa-
tion.
CAUTION!
The catalytic converter requires the use of unleaded
fuel only. Leaded gasoline will destroy the effective-
ness of the catalyst as an emissions control device
and may seriously reduce engine performance and
cause serious damage to the engine.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.
378 MAINTAINING YOUR VEHICLE

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 tuneup to manufacturer’s specifica-
tions, should be obtained immediately. To minimize the possibility of catalytic converter dam-
age:
•Do not shut off the engine or interrupt the ignition,
when the transmission is in gear and the vehicle is in
motion.
•Do not try to start the engine by pushing or towing the
vehicle.
•Do 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.
7
MAINTAINING YOUR VEHICLE 379

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
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 383

Brake Assist System.................... 271
Electronic Roll Mitigation ................ 272
Electronic Stability Program ............... 273
Traction Control System ................. 271
Electronic Roll Mitigation (ERM) ............. 272
Electronic Speed Control (Cruise Control) ....... 116
Electronic Stability Program (ESP) ............ 273
Electronic Throttle Control Warning Light ...... 167
Electronic Vehicle Information Center
(EVIC) ............................. 164,168
Emergency, In Case of Freeing Vehicle When Stuck ............... 252
Hazard Warning Flasher ................. 346
Jacking ............................. 348
Jump Starting ......................... 355
Tow Hooks .......................... 359
Emission Control System Maintenance ......366,418
Engine Air Cleaner .......................... 372 Block Heater
......................... 242
Break-In Recommendations ................ 71
Compartment ...................... 363,364
Compartment Identification ............363,364
Cooling ............................. 380
Exhaust Gas Caution .................. 72,319
Fails to Start .......................... 241
Flooded, Starting ...................... 241
Fuel Requirements .................. 315,413
Jump Starting ......................... 355
Multi-Displacement .................... 265
Oil .............................. 369,413
Oil Change Interval .................... 370
Oil Disposal .......................... 371
Oil Filter ............................ 372
Oil Filter Disposal ..................... 371
Oil Selection ....................... 370,413
Oil Synthetic ......................... 371
Overheating .......................... 346
450 INDEX

Multi-Function Control Lever............... 101
New Vehicle Break-In Period ................ 71
Occupant Restraints ................... 35,52,56
Occupant Restraints (Sedan) .............49,52,54
Octane Rating, Gasoline (Fuel) .............. 315
Odometer .......................... 164,166
Trip ................................ 164
Off-Pavement Driving (Off-Road) ..........259,392
Off-Road Driving (Off-Pavement) ..........259,392
Oil Change Indicator ..................... 172
Oil Change Indicator, Reset ................. 172
Oil, Engine ............................ 369
Capacity ............................ 413
Change Interval ....................... 370
Dipstick ............................. 369
Disposal ............................ 371
Filter ............................... 372 Filter Disposal
........................ 371
Identification Logo ..................... 370
Materials Added to ..................... 371
Recommendation ................... 370,413
Synthetic ............................ 371
Viscosity ......................... 371,413
Onboard Diagnostic System ..............365,366
Opener, Garage Door (HomeLink) ........... 128
Operator Manual (Owner’s Manual) ............ 6
Outside Rearview Mirrors .................. 81
Overdrive ............................. 248
Overdrive OFF Switch .................... 248
Overhead Console ....................... 127
Overheating, Engine ................... 164,346
Owner’s Manual (Operator Manual) .........6,441
Paint Care ............................. 393
Paint Damage .......................... 393
Panic Alarm ............................ 23
10
INDEX 457