coolant temperature JEEP GRAND CHEROKEE 2015 WK2 / 4.G Diesel Supplement Manual

ENGINE BREAK-IN RECOMMENDATIONS
The diesel engine does not require a break-in period due
to its construction. Normal operation is allowed, provid-
ing the following recommendations are followed:
•Warm up the engine before placing it under load.
•Do not operate the engine at idle for prolonged
periods.
•Use the appropriate transmission gear to prevent
engine lugging.
•Observe vehicle oil pressure and temperature indica-
tors.
•Check the coolant and oil levels frequently.
•Vary throttle position at highway speeds when carry-
ing or towing significant weight.NOTE:Light duty operation such as light trailer towing
or no load operation will extend the time before the
engine is at full efficiency. Reduced fuel economy and
power may be seen at this time.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil
changes should be consistent with anticipated climate
conditions under which vehicle operations will occur.
The recommended viscosity and quality grades are
shown under “Fluids, Lubricants and Genuine Parts”,
under “Maintaining Your Vehicle” in this manual. NON-
DETERGENT OR STRAIGHT MINERAL OILS MUST
NEVER BE USED.
10 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE

12. Temperature Gauge
The temperature gauge shows engine coolant tempera-
ture. Any reading within the normal range indicates that
the engine cooling system is operating properly.
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.
NOTE:Temperature readings in the orange range of the
gauge are acceptable under some high load condition. If
the gauge points to the H orEngine Temperature Hot
DID message appears a light and a single chime will
require driver correction.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 dealer 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
for service if your vehicle overheats. If you decide to
look under the hood yourself, see “Maintaining Your
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16 UNDERSTANDING YOUR INSTRUMENT PANEL

Engine Idling
Avoid prolonged idling, long periods of idling may be
harmful to your engine because combustion chamber
temperatures can drop so low that the fuel may not burn
completely. Incomplete combustion allows carbon and
varnish to form on piston rings, cylinder head valves,
and injector nozzles. Also, the unburned fuel can enter
the crankcase, diluting the oil and causing rapid wear to
the engine.
Stopping The Engine
After full load operation, idle the engine for a few
minutes before shutting it down. This idle period will
allow the lubricating oil and coolant to carry excess heat
away from the turbocharger.
NOTE:Refer to the following chart for proper engine
shutdown.
Driving Condition LoadTurbocharger
TemperatureIdle Time (min.) Before
Engine Shutdown
Stop and Go Empty Cool None
Stop and Go Medium 0.5
Highway Speeds Medium Warm 1.0
City Traffic Maximum GCWR 1.5
Highway Speeds Maximum GCWR 2.0
Uphill Grade Maximum GCWR Hot 2.5
4
STARTING AND OPERATING 43

NOTE:Under certain conditions the engine fan will run
after the engine is turned off. These conditions are under
high load and high temperature conditions.
Cooling System Tips — Automatic Transmission
To reduce the potential for engine and transmission
overheating in high ambient temperature conditions,
take the following actions:
•City Driving — When stopped, shift the transmission
into NEUTRAL and increase engine idle speed.
•Highway Driving — Reduce your speed.
•Up Steep Hills — Select a lower transmission gear.
•Air Conditioning — Turn it off temporarily.
NOTE:If the coolant temperature is too high the A/C
will automatically turn off.
Do Not Operate The Engine With Low Oil
Pressure
If the low oil pressure warning light turns on while
driving, stop the vehicle and shut down the engine as
soon as possible. A chime will sound when the light turns
on.
NOTE:Do not operate the vehicle until the cause is
corrected. This light does not show how much oil is in the
engine. The engine oil level must be checked under the
hood.
CAUTION!
If oil pressure falls to less than normal readings, shut
the engine off immediately. Failure to do so could
result in immediate and severe engine damage.
44 STARTING AND OPERATING

Do Not Operate The Engine With Failed Parts
All engine failures give some warning before the parts
fail. Be on the alert for changes in performance, sounds,
and visual evidence that the engine requires service.
Some important clues are:
•engine misfiring or vibrating severely
•sudden loss of power
•unusual engine noises
•fuel, oil or coolant leaks
•sudden change, outside the normal operating range, in
the engine operating temperature
•excessive smoke
•oil pressure drop
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms engine coolant and
permits quicker starts in cold weather. Connect the heater
cord to a ground-fault interrupter protected 110–115 Volt
AC electrical outlet with a grounded, three-wire exten-
sion cord.
Its use is recommended for environments that routinely
fall below -10°F (-23°C). It should be used when the
vehicle has not been running for long periods of time and
should be plugged in two hours prior to start. Its use is
required for cold starts with temperatures under -20°F
(-28°C).
To ensure reliable starting at these temperatures, use of
an externally powered electric engine block heater (avail-
able from your authorized dealer) is recommended.
4
STARTING AND OPERATING 45

spraying water from a garden hose vertically down the
face of the A/C condenser (if equipped) or the back of the
radiator core.
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.
The radiator drain cock is located in the lower radiator
tank. If the cap is sealing properly, the engine coolant
(antifreeze) will begin to drain from the coolant expan-
sion bottle. DO NOT REMOVE THE COOLANT PRES-
SURE CAP WHEN THE COOLING SYSTEM IS HOT.Cooling System — Drain Flush And Refill
If the engine coolant (antifreeze) is dirty or contains a
considerable amount of sediment, clean and flush with a
reliable cooling system cleaner. Follow with a thorough
rinsing to remove all deposits and chemicals. Properly
dispose of old engine coolant (antifreeze).
Refer to the “Maintenance Schedule” for the proper
maintenance intervals.
Selection Of Coolant
Refer to “Fluids, Lubricants, And Genuine Parts” in
“Maintaining Your Vehicle” for further information.
5
MAINTAINING YOUR VEHICLE 89

Please review these recommendations for using Organic
Additive Technology (OAT) engine coolant (antifreeze)
that meets the requirements of FCA Material Standard
MS.90032. When adding engine coolant (antifreeze):
•We recommend using MOPAR® Antifreeze/Coolant
10 Year/150,000 Mile Formula OAT (Organic Additive
Technology) that meets the requirements of FCA Ma-
terial Standard MS.90032.
•Mix a minimum solution of 50% OAT engine coolant
that meets the requirements of FCA Material Standard
MS.90032 and distilled water. Use higher concentra-
tions (not to exceed 70%) if temperatures below 34° F
(37° C) are anticipated.
•Use only high purity water such as distilled or deion-
ized water when mixing the water/engine coolant
(antifreeze) 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:
•Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could
lead to severe internal engine damage. If any coolant is
needed to be added to the system please contact your
local authorized dealer.
•Mixing engine coolant (antifreeze) types is not recom-
mended and can result in cooling system damage. If
HOAT and OAT coolant are mixed in an emergency,
have a authorized dealer drain, flush, and refill with
OAT coolant (conforming to MS.90032) as soon as
possible.
5
MAINTAINING YOUR VEHICLE 91

Selection Of Coolant (Antifreeze)..........89, 97
Diesel Fuel...............................46
Diesel Fuel Requirements....................46
Bulk Storage Of.........................68
Diesel Fuel System, Re-Priming................85
Disposal
Antifreeze (Engine Coolant).................92
Draining Fuel/Water Separator Filter............81
Driver Information Display
DID ...............................22, 26
Instrument Cluster.......................22
Instrument Cluster Display...............22, 26
Electronic Vehicle Information Center (EVIC)......20
Engine..................................74
Air Cleaner............................78
Block Heater.........................38, 45
Break-In Recommendations.................10Compartment...........................74
Coolant (Antifreeze)......................97
Identification...........................74
Idling................................43
Oil................................76, 97
Oil Filler Cap...........................77
Temperature Gauge......................16
Filters
Air Cleaner............................78
Air Conditioning........................79
Engine Fuel............................81
Engine Oil..........................78, 97
Engine Oil Disposal......................78
Flashers
Turn Signal............................14
Fluid, Brake..............................99
Fluid Capacities...........................96
7
INDEX 113

Fluid Level Checks
Brake................................94
Fluids, Lubricants And Genuine Parts............97
Fog Lights...............................14
Fuel...................................46
Adding...............................65
Diesel..............................46, 97
Filter.................................81
Gauge................................18
Requirements...........................46
Specifications...........................47
Tank Capacity..........................96
Fueling.................................65
Gauges
Coolant Temperature.....................16
Fuel.................................18
Speedometer...........................14
Tachometer............................13Voltmeter..............................41
Gross Axle Weight Rating....................52
Gross Vehicle Weight Rating..................51
High Beam Indicator........................14
Hitches
Trailer Towing..........................55
Instrument Cluster.......................12, 13
Intervention Regeneration Strategy...........28, 87
Lights
AirBag ...............................21
Anti-Lock.............................13
Brake Warning..........................17
Fog ..................................14
High Beam Indicator......................14
Malfunction Indicator (Check Engine)..........14
Seat Belt Reminder.......................13
114 INDEX

Automatic Transmission...................38
Engine Block Heater...................38, 45
Remote................................8
Starting Procedures.........................37
Starting Procedures (Diesel Engines).............37
Tachometer..............................13
Temperature Gauge, Engine Coolant.............16
Ti re s
Pressure Warning Light....................18
Trailer Towing..........................59
Tongue Weight/Trailer Weight.................56
Towing.................................51
Guide................................56
Weight...............................56
Trailer Towing............................51
Cooling System Tips......................63
Hitches...............................55
Minimum Requirements...................57Trailer And Tongue Weight.................56
Wiring................................61
Trailer Towing Guide.......................56
Trailer Weight............................56
Transfer Case
Fluid.................................99
Transmission
Fluid.................................99
Turn Signals..............................14
Viscosity, Engine Oil........................77
Voltmeter................................41
Water Separator, Diesel Fuel..................81
116 INDEX