2010 JEEP GRAND CHEROKEE oil temperature

The gauge pointer will likely indicate a higher tempera-
ture when driving in hot weather, up mountain grades,
or when towing a trailer. It should not be allowed to
exceed the upper limits of the normal operating range.
CAUTION!
Driving with a hot engine cooling system could
damage your vehicle. If the temperature gauge reads
“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 the “H” and you hear continuous chimes,
turn the engine off immediately, and call an autho-
rized dealership for service.
WARNING!
A hot engine cooling system is dangerous. You or
others could be badly burned by steam or boiling
coolant. You may want to call an authorized dealer-
ship for service if your vehicle overheats. If you
decide to look under the hood yourself, see “Main-
taining Your Vehicle”. Follow the warnings under the
Cooling System Pressure Cap paragraph.
14. Electronic Vehicle Information Center (EVIC)
Display
When the appropriate conditions exist, this display
shows the Electronic Vehicle Information Center (EVIC)
messages. Refer to “Electronic Vehicle Information Cen-
ter”.
164 UNDERSTANDING YOUR INSTRUMENT PANEL

defrost/floor modes. Attempting to use Recirculation
while in these modes will cause the LED in the button to
blink and then turn off.
Operating Tips
Window Fogging
Windows will fog on the inside when the humidity inside
the vehicle is high. This often occurs in mild or cool
temperatures when it’s rainy or humid. In most cases,
turning the air conditioning (pressing the snowflake
button) on will clear the fog. Adjust the temperature
control, air direction, and blower speed to maintain
comfort.
As the temperature gets colder, it may be necessary to
direct air onto the windshield. Adjust the temperature
control and blower speed to maintain comfort. Higher
blower speeds will reduce fogging. Interior fogging on
the windshield can be quickly removed by selecting the
defrost mode.Regular cleaning of the inside of the windows with a
non-filming cleaning solution (vinegar and water works
very well) will help prevent contaminates (cigarette
smoke, perfumes, etc.) from sticking to the windows.
Contaminates increase the rate of window fogging.Summer Operation
Air conditioned vehicles must be protected with a high
quality antifreeze coolant, during the summer, to provide
proper corrosion protection and to raise the boiling point
of the coolant for protection against overheating. A 50 %
concentration is recommended. Refer to Fluids, Lubri-
cants, and Genuine Parts in “Maintaining Your Vehicle”
for the proper coolant type.
When using the air conditioner in extremely heavy
traffic, in hot weather, especially when towing a trailer,
additional engine cooling may be required. If this situa-
tion is encountered, operate the transmission in a lower
gear to increase engine RPM, coolant flow and fan speed.4
UNDERSTANDING YOUR INSTRUMENT PANEL 231

release it as soon as the starter engages. The starter motor
will disengage automatically in 10 seconds. Once this
occurs, release the accelerator pedal, turn the ignition
switch to the LOCK position, wait 10 to 15 seconds, then
repeat the “Normal Starting” procedure.
CAUTION!
To prevent damage to the starter, wait 10 to 15 sec-
onds before trying again.
After Starting
The idle speed is controlled automatically, and it will
decrease as the engine warms up.
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms the engine, and permits
quicker starts in cold weather. Connect the heater cord to
a ground-fault interrupter protected 110-115 Volt ACelectrical outlet with a grounded, three-wire extension
cord.
Use the heater when temperatures below 0°F (-18°C) are
expected to last for several days.
The block heater must be plugged in at least one hour to
have an adequate warming effect on the coolant.
The engine block heater cord is located:
•3.7L Engine — coiled and strapped to the engine oil
dipstick tube.
•5.7L Engine — bundled and fastened to the injector
harness.
WARNING!
Remember to disconnect the cord before driving.
Damage to the 110-115 Volt AC electrical cord could
cause electrocution.
242 STARTING AND OPERATING

Engine Oil Viscosity (3.7L and 5.7L Engines)
SAE 5W-20 engine oil is recommended for all operating
temperatures. This engine oil improves low temperature
starting and vehicle fuel economy.
The engine oil filler cap also shows the recommended
engine oil viscosity for your vehicle. For information on
engine oil filler cap location, refer to “Engine Compart-
ment” in “Maintaining Your Vehicle” for further informa-
tion.
NOTE:Vehicles equipped with a 5.7L engine must use
SAE 5W-20 oil. Failure to do so may result in improper
operation of the Multiple Displacement System (MDS).
Refer to “Multi-Displacement System” in “Starting and
Operating” for further information.
Lubricants, which do not have both the engine oil certi-
fication mark and the correct SAE viscosity grade num-
ber, should not be used.
Synthetic Engine Oils
You may use synthetic engine oils if the recommended oil
quality requirements are met, and the recommended main-
tenance intervals for oil and filter changes are followed.
Materials Added to Engine Oils
The manufacturer strongly recommends against the ad-
dition of any additives (other than leak detection dyes) to
the engine oil. Engine oil is an engineered product and its
performance may be impaired by supplemental
additives.
Disposing of Used Engine Oil and Oil Filters
Care should be taken in disposing of used engine oil and
oil filters from your vehicle. Used oil and oil filters,
indiscriminately discarded, can present a problem to the
environment. Contact your local authorized dealer, ser-
vice station, or governmental agency for advice on how
and where used oil and oil filters can be safely discarded
in your area.
7
MAINTAINING YOUR VEHICLE 371

located in the engine compartment, be sure to check the
fluid level at regular intervals. Fill the reservoir with
windshield washer solvent only (not radiator antifreeze).
When refilling the washer fluid reservoir, take some
washer fluid and apply it to a cloth or towel and wipe
clean the wiper blades, this will help blade performance.
To prevent freeze-up of your windshield washer system
in cold weather, select a solution or mixture that meets or
exceeds the temperature range of your climate. This
rating information can be found on most washer fluid
containers.
WARNING!
Commercially available windshield washer solvents
are flammable. They could ignite and burn you. Care
must be exercised when filling or working around
the washer solution.
Exhaust System
The best protection against carbon monoxide entry into
the vehicle body is a properly maintained engine exhaust
system.
If you notice a change in the sound of the exhaust system;
or if the exhaust fumes can be detected inside the vehicle;
or when the underside or rear of the vehicle is damaged;
have an authorized technician inspect the complete ex-
haust system and adjacent body areas for broken, dam-
aged, deteriorated, or mispositioned parts. Open seams
or loose connections could permit exhaust fumes to seep
into the passenger compartment. In addition, inspect the
exhaust system each time the vehicle is raised for lubri-
cation or oil change. Replace as required.
7
MAINTAINING YOUR VEHICLE 377

Fluid Level Check (5.7L Engine)
Check the fluid level while the transmission is at normal
operating temperature. This occurs after at least 15 miles
(25 km) of driving. At normal operating temperature the
fluid cannot be held comfortably between the fingertips.
To check the fluid level properly, the following procedure
must be used:
1. Operate the engine at idle speed and normal operating
temperature.
2. The vehicle must be on level ground.
3. Fully apply the parking brake, and press the brake
pedal.
4. Place the shift lever momentarily in each gear position
ending with the shift lever in PARK.
5. Remove the dipstick, wipe it clean and reinsert it until
seated.6. Remove the dipstick again, and note the fluid level on
both sides. The fluid level should be between the “HOT”
(upper) reference holes on the dipstick at normal operat-
ing temperature. The fluid level is only valid if there is a
solid coating of oil on both sides of the dipstick. If the
fluid is low, add as required into the dipstick tube.
Do
not overfill. After adding any quantity of oil through the
oil fill tube, wait a minimum of two minutes for the oil to
fully drain into the transmission before rechecking the
fluid level.
NOTE: If it is necessary to check the transmission below
the operating temperature, the fluid level should be
between the two “COLD” (lower) holes on the dipstick
with the fluid at approximately 70°F (21°C) (room tem-
perature). If the fluid level is correctly established at
room temperature, it should be between the “HOT”
(upper) reference holes when the transmission reaches
180°F (82°C). Remember it is best to check the level at the
normal operating temperature.
7
MAINTAINING YOUR VEHICLE 391

Starting............................. 240
Temperature Gauge .................... 163
Engine Oil Viscosity ...................... 371
Engine Oil Viscosity Chart ................. 371
Enhanced Accident Response Feature .......... 55
Entry System, Illuminated .................. 20
Exhaust Gas Caution ................72,319,378
Exhaust System ....................... 72,377
Exterior Finish Care ...................... 393
Exterior Lights .......................... 74
Filters Air Cleaner .......................... 372
Engine Oil ........................... 372
Engine Oil Disposal .................... 371
Finish Care ............................ 393
Flashers .............................. 346
Hazard Warning ....................... 346
Turn Signal ................... 74,159,409,410Flipper Glass, Liftgate
..................... 34
Flooded Engine Starting ................... 241
Fluid Capacities ......................... 413
Fluid Leaks ............................. 74
Fluid Level Checks Automatic Transmission ............389,390,391
Brake .............................. 386
Engine Oil ........................... 369
Power Steering ........................ 264
Fluids, Lubricants and Genuine Parts .......... 414
Fog Light Service ........................ 410
Fog Lights ....................... 106,167,410
Folding Rear Seat ........................ 93
Four Wheel Drive ....................... 253
Operation ........................... 253
Systems ............................. 253
Four Wheel Drive Operation ................ 253
Four-Way Hazard Flasher .................. 346
Freeing A Stuck Vehicle ................... 252
10
INDEX 451

Sway Control, Trailer..................... 278
Synthetic Engine Oil ...................... 371
System, Remote Starting .................... 25
Tachometer ............................ 161
Telescoping Steering Column ............... 114
Temperature Control, Automatic (ATC) ........ 224
Temperature Gauge, Engine Coolant .......... 163
Tether Anchor, Child Restraint ............... 65
Theft System Arming ...................... 19
Theft System Disarming .................... 20
Tie Down Hooks, Cargo ................... 145
Tilt Steering Column ..................... 114
Time Delay, Headlight .................... 108
Tire and Loading Information Placard ......291,292
Tire Identification Number (TIN) ............. 288
Tire Markings .......................... 284
Tire Safety Information .................... 284
Tires ............................ 74,295,443Air Pressure
.......................... 296
Chains .............................. 302
Changing ............................ 348
Compact Spare ........................ 298
General Information .................... 295
High Speed .......................... 298
Inflation Pressures ..................... 296
Jacking ............................. 348
Life of Tires .......................... 301
Load Capacity ..................... 291,292
Pressure Monitor System (TPMS) ........... 304
Pressure Warning Light .................. 162
Quality Grading ....................... 443
Radial .............................. 298
Replacement ......................... 301
Rotation ............................ 303
Safety .............................. 284
Sizes ............................... 286
Spare Tire ........................... 349
462 INDEX