2006 JEEP GRAND CHEROKEE coolant temperature

13. Temperature Gauge
The temperature gauge shows engine coolant tempera-
ture. Any reading within the normal range indicates that
the engine cooling system is operating satisfactorily.
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 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 for service.
WARNING!
A hot engine cooling system is dangerous. You or
others could be badly burned by steam or boiling
coolant. If you decide to look under the hood your-
self, refer to Section 7 of this manual. Follow the
warnings under “Cooling System Pressure Cap.”
180 UNDERSTANDING YOUR INSTRUMENT PANEL

Cooling System
WARNING!
•When working near the radiator cooling fan, dis-
connect the fan motor lead or turn the ignition
switch to the OFF position. The fan is temperature
controlled and can start at any time the ignition
switch is in the ON position.
•You or others can be badly burned by hot coolant
or steam from your radiator. If you see or hear
steam coming from under the hood, don’t open
the hood until the radiator has had time to cool.
Never try to open a cooling system pressure cap
when the radiator is hot.
Coolant Checks
Check engine coolant (antifreeze) protection every 12
months (before the onset of freezing weather, whereapplicable). If coolant is dirty or rusty in appearance, the
system should be drained, flushed and refilled with fresh
coolant. Check the front of the A/C condenser for any
accumulation of bugs, leaves, etc. If dirty, clean by gently
spraying water from a garden hose vertically down the
face of the condenser.
Check the coolant recovery bottle tubing for brittle rub-
ber, cracking, tears, cuts and tightness of the connection
at the 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
coolant from the radiator drain cock. If the cap is sealing
properly, the engine coolant (antifreeze) will begin to
drain from the coolant recovery bottle. DO NOT RE-
MOVE THE COOLANT PRESSURE CAP WHEN THE
COOLING SYSTEM IS HOT.
314 MAINTAINING YOUR VEHICLE

Adding Coolant
Your vehicle has been built with an improved engine
coolant that allows extended maintenance intervals. This
coolant can be used up to 5 Years or 100,000 miles before
replacement. To prevent reducing this extended mainte-
nance period, it is important that you use the same
coolant throughout the life of your vehicle. Please review
these recommendations for using Hybrid Organic Addi-
tive Technology (HOAT) coolant.
When adding coolant, a minimum solution of 50% rec-
ommended Mopar Antifreeze/ Coolant 5 Year/100,000
Mile Formula HOAT (Hybrid Organic Additive Technol-
ogy), or equivalent, in water should be used. Use higher
concentrations (not to exceed 70%) if temperatures below

34°F (
37°C ) are anticipated.
Use only high purity water such as distilled or deionized
water when mixing the water/engine coolant solution.The use of lower quality water will reduce the amount of
corrosion protection in the engine cooling system.
Please note that it is the owner’s responsibility to main-
tain the proper level of protection against freezing ac-
cording to the temperatures occurring in the area where
the vehicle is operated.
NOTE:Mixing coolant types will decrease the life of the
engine coolant and will require more frequent coolant
changes.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of
coolant, and to insure that coolant will return to the
radiator from the coolant recovery bottle.
The cap should be inspected and cleaned if there is any
accumulation of foreign material on the sealing surfaces.
316 MAINTAINING YOUR VEHICLE

WARNING!
•The warning words “DO NOT OPEN HOT” on
the cooling system pressure cap are a safety pre-
caution. Never add coolant 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
engine damage may result.
Disposal of Used Engine Coolant
Used ethylene glycol based engine coolant is a regulated
substance requiring proper disposal. Check with your
local authorities to determine the disposal rules for your
community. To prevent ingestion by animals or childrendo not store ethylene glycol based engine 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 immediately.
Coolant Level
The coolant bottle provides a quick visual method for
determining that the coolant level is adequate. With the
engine off and cold, the level of the coolant 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
coolant freeze point or replacing coolant. 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 coolant is needed to maintain the
proper level, it should be added to the coolant bottle. Do
not overfill.
MAINTAINING YOUR VEHICLE 317
7

Schedule “B”
Follow this schedule if you usually operate your vehicle
under one or more of the following conditions.
•Day or night temperatures are below 32°F (0°C)
•Stop and go driving
•Excessive engine idling
•Driving in dusty conditions
•Short trips of less than 10 miles (16.2 km)
•More than 50% of your driving is at sustained high
speeds during hot weather, above 90°F (32°C)
•Trailer towing
NOTE:IfANYof these apply to you, change your
engine oil every 3,000 miles (5 000 km) or 3 months,
whichever comes first, and follow the maintenance rec-
ommendations in “Maintenance Schedule B.”
NOTE:IfANYof these apply to you then flush and
replace your engine coolant every 102,000 miles (170 000
km) or 60 months, whichever comes first, and follow
“Schedule B” of the “Maintenance Schedules” section of
this manual.
SCHEDULE “B” 349
8
M
A
I
N
T
E
N
A
N
C
E
S
C
H
E
D
U
L
E
S

ABS (Anti-Lock Brake System)............177,243
Adding Engine Coolant (Antifreeze).......... 316
Adding Washer Fluid..................... 169
Additives, Fuel......................... 270
Adjustable Pedals....................... 144
Air Conditioner Maintenance............... 309
Air Conditioning Refrigerant............... 310
Air Pressure, Tires....................... 258
Airbag................................ 42
Airbag Deployment....................... 55
Airbag Light.......................57,71,177
Airbag Maintenance....................... 56
Alarm (Security Alarm).................25,178
Alarm System (Security Alarm)............... 25
Alignment and Balance................... 264
Alterations/Modifications, Vehicle............. 8
Antenna, Satellite Radio................... 218
Antifreeze (Engine Coolant)..............315,341
Disposal............................ 317Anti-Lock Brake System (ABS)............131,243
Anti-Lock Warning Light.................. 177
Anti-Theft System.....................25,178
Appearance Care........................ 324
Auto Down Power Windows................ 30
Automatic Dimming Mirror................. 78
Automatic Door Locks..................... 19
Automatic Headlights.................... 121
Automatic Temperature Control (ATC)......... 222
Automatic Transmission.............236,323,324
Adding Fluid......................... 324
Fluid and Filter Changes................. 324
Fluid Change......................... 324
Fluid Level Check...................... 323
Autostick............................. 239
Auxiliary Electrical Outlet (Power Outlet)...... 160
Auxiliary Power Outlet................... 160
Battery............................... 307
374 INDEX

Filler Door (Gas Cap)................... 272
Filter............................... 305
Gasoline............................ 268
Gauge.............................. 182
Hoses.............................. 322
Requirements......................268,341
Tank Capacity........................ 341
Fuel System Caution..................... 273
Fuses................................ 328
Garage Door Opener (HomeLink) ........... 150
Gas Cap (Fuel Filler Cap)...............272,297
Gasoline, Clean Air...................... 269
Gasoline (Fuel)......................... 268
Gasoline, Reformulated................... 269
Gauges
Coolant Temperature.................... 180
Fuel................................ 182
Speedometer......................... 176Tachometer.......................... 178
Gear Ranges........................... 237
General Information....................23,268
Glass Cleaning.......................... 328
Gross Axle Weight Rating.................. 275
Gross Vehicle Weight Rating................ 275
Hands-Free Phone (UConnect™).............. 82
Hazard Warning Flasher................... 288
Head Restraints......................... 107
Head Rests............................ 107
Headlights............................ 121
Bulb Replacement...................... 335
On With Wipers....................... 121
Replacing............................ 335
Heated Mirrors.......................... 80
Heated Seats........................... 108
High Beam Indicator..................... 176
High Beam/Low Beam Select (Dimmer) Switch . . 125
INDEX 379
10

Emergency (Jump Starting)............... 289
Engine Fails to Start.................... 235
Steering
Power...........................246,310
Wheel, Tilt........................... 130
Steering Wheel Mounted Sound System
Controls............................. 219
Storage............................... 334
Storage, Behind the Seat................... 163
Storage Bin............................ 163
Storage Compartment, Center Seat............ 111
Storage, Vehicle......................229,334
Storing Your Vehicle...................... 334
Sun Roof.............................. 157
Sunglasses Storage....................... 149
Supplemental Restraint System - Airbag........ 42
Tachometer............................ 178
Temperature Control, Automatic (ATC)........ 222Temperature Gauge, Engine Coolant.......... 180
Tether Anchor, Child Restraint............... 63
Tie Down Hooks, Cargo................... 165
Tilt Steering Column..................... 130
Time Delay, Headlight.................... 125
Tire and Loading Information Placard......... 252
Tire Identification Number (TIN)............. 251
Tire Markings.......................... 247
Tire Safety Information.................... 247
Tires ...............................71,256
Air Pressure.......................... 258
Alignment and Balance.................. 264
General Information.................... 256
High Speed.......................... 260
Inflation Pressures..................... 258
Life of Tires.......................... 262
Load Capacity.....................252,253
Pressure Monitor System (TPMS)........... 265
Pressure Warning Light.................. 179
INDEX 387
10