2010 JEEP GRAND CHEROKEE radiator cap

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

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.
380 MAINTAINING YOUR VEHICLE

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

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.
384 MAINTAINING YOUR VEHICLE

Special Additives...................... 389
Torque Converter ...................... 251
Autostick ............................. 246
Auxiliary Electrical Outlet (Power Outlet) ...... 137
Auxiliary Power Outlet ................... 137
Battery ............................... 373
Keyless Transmitter Replacement (RKE) ....... 24
Saving Feature (Protection) ............... 106
Belts, Seat ............................ 36,73
Body Mechanism Lubrication ............... 375
B-Pillar Location ........................ 291
Brake Assist System ...................... 271
Brake Control System, Electronic ............. 270
Brake Fluid ............................ 386
Brake System ........................... 385
Anti-Lock (ABS) .................... 268,270
Fluid Check .......................... 386
Master Cylinder ....................... 386 Parking
............................. 265
Warning Light ........................ 158
Brake/Transmission Interlock ............... 244
Break-In Recommendations, New Vehicle ........ 71
Bulb Replacement ..................... 406,407
Bulbs, Light ............................ 74
Calibration, Compass ..................... 177
Camera, Rear ........................... 125
Capacities, Fluid ........................ 413
Caps, Filler Fuel ............................... 320
Power Steering ........................ 264
Radiator (Coolant Pressure) ............... 383
Car Washes ............................ 393
Carbon Monoxide Warning ...............72,319
Cargo Area Cover ....................... 144
Cargo Area Features ...................... 143
Cargo Compartment ...................... 143
10
INDEX 447

Disposal of Used Coolant................ 384
Drain, Flush, and Refill .................. 381
Inspection ........................... 380
Points to Remember .................... 384
Pressure Cap ......................... 383
Radiator Cap ......................... 383
Selection of Coolant (Antifreeze) .........381,413
Cruise Light ........................... 166
Cupholders ............................ 142
Customer Assistance ..................... 437
Daytime Running Lights ................... 104
Dealer Service .......................... 368
Defroster, Rear Window ................... 149
Defroster, Windshield ................74,223,229
Diagnostic System, Onboard ................ 365
Dimmer Switch, Headlight ................. 108
Dipsticks Automatic Transmission ................. 391 Oil (Engine)
.......................... 369
Power Steering ........................ 264
Disabled Vehicle Towing ................... 359
Disarming, Theft System ................... 20
Disposal Engine Oil ........................... 371
Used Engine Fluids .................... 371
Door Locks ............................. 28
Door Locks, Automatic .................... 29
Door Opener, Garage ..................... 128
Driving ............................... 258
Off-Pavement ......................... 259
Off-Road ............................ 259
Driving to Achieve Maximum Fuel Economy .... 174
Electric Remote Mirrors .................... 82
Electrical Outlet, Auxiliary (Power Outlet) ...... 137
Electronic Brake Control System ............. 270
Anti-Lock Brake System ................. 270
10
INDEX 449