2007 DODGE RAM 2500 DIESEL coolant temperature

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.
Extremely cold ambient temperature may require the
addition of a “winter front” for effective operation of the
cab heating/cooling system. Make certain that a percent-
age of the radiator is exposed for adequate air flow
through the charge air cooler and automatic transmission
oil cooler. The percentage of opening must be increased
with the increasing ambient air temperature and/or
engine load. If the cooling fan can be heard cycling
frequently, increase the size of the opening in the winter
front.Coolant bottle level check
The coolant reserve system provides a quick visual
method of determining that the coolant level is adequate.
With the engine idling, and warmed to the normal
operating temperature, the level of the coolant on the
coolant bottle should be between the fluid level marks.
Check the coolant level whenever the hood is raised.
The radiator normally remains completely full, so there is
no longer a need to remove the coolant pressure cap
except for checking coolant freeze point or replacement
with new antifreeze coolant.
402 MAINTAINING YOUR VEHICLE

CAUTION!
Mixing of coolants other than specified HOAT en-
gine coolants, may result in engine damage and may
decrease corrosion protection. If a non-HOAT cool-
ant is introduced into the cooling system in an
emergency, it should be replaced with the specified
coolant as soon as possible.
Do not use plain water alone or alcohol base engine
coolant (antifreeze) products. Do not use additional
rust inhibitors or antirust products, as they may not
be compatible with the radiator engine coolant and
may plug the radiator.
This vehicle has not been designed for use with
Propylene Glycol based coolants. Use of Propylene
Glycol based coolants is not recommended.
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.
404 MAINTAINING YOUR VEHICLE

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.
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.
MAINTAINING YOUR VEHICLE 405
7

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. Do not store ethylene glycol-based engine
coolant in open containers or allow it to remain in
puddles on the ground. Prevent ingestion by animals and
children. 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 cold, the level of the coolant in the coolant
recovery 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.
Points To Remember
NOTE:
When the vehicle is stopped after a few miles (a
few kilometers) of operation, you may observe vapor
coming from the front of the engine compartment. This is
normally a result of moisture from rain, snow, or high
humidity accumulating on the radiator and being vapor-
ized when the thermostat opens, allowing hot coolant to
enter the radiator.
If an examination of your engine compartment shows no
evidence of radiator or hose leaks, the vehicle may be
safely driven. The vapor will soon dissipate.
406 MAINTAINING YOUR VEHICLE

EMISSION CONTROL SYSTEM MAINTENANCE
The “Scheduled” maintenance services, listed inbold
type in this section (Section 8) must be done at the times
or mileages specified to assure the continued proper
functioning of the emission control system. These, and all
other maintenance services included in this manual,
should be done to provide best vehicle performance and
reliability. More frequent maintenance may be needed for
vehicles in severe operating conditions such as dusty
areas and very short trip driving.
Inspection and service also should be done any time a
malfunction is suspected.
NOTE: Maintenance, replacement, or repair of the emis-
sion control devices and systems on your vehicle may be
performed by any automotive repair establishment or
individual using any automotive part which has been
certified pursuant to U.S. EPA or, in the State of Califor-
nia, California Air Resources Board regulations.
MAINTENANCE SCHEDULES — 5.9L CUMMINS
TURBO DIESEL
There are two maintenance schedules that show the
required service for your vehicle.
First is Schedule “B”. It is for vehicles that are operated
under one or more of the following conditions that are
listed below and at the beginning of the schedule.
•Frequent short trips where the engine does not achieve
full operating temperature (operating temperature de-
fined as 190° F (66 ° C ) coolant temperature).
•Extensive engine idling (over 10 minutes per hour of
operation) at ambient temperatures less than 32° F (0°
C).
•Driving in dusty conditions.
•Frequent trailer towing.
•Taxi, police, or delivery service (commercial service).
450 MAINTENANCE SCHEDULES
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Schedule “B”
Follow schedule “B” if you usually operate your vehicle
under one or more of the following conditions.
•Frequent short trips where the engine does not achieve
full operating temperature (operating temperature de-
fined as 190° F (66 ° C ) coolant temperature).
•Extensive engine idling (over 10 minutes per hour of
operation) at ambient temperatures less than 32° F (0°
C).
•Driving in dusty conditions.
•Frequent trailer towing.
•Taxi, police, or delivery service (commercial service).
•Off-road or desert operation.
•Extensive operation at high engine speeds (greater
than 2900 rpm) and loads (greater than 70% throttle).
NOTE: IfANY of these apply to you then change your
coolant every 101,250 miles (162 000 km) or 60 months,
whichever comes first and follow schedule “B” of the
 Maintenance Schedules section of this manual.
SCHEDULE “B” 453
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Temperature Gauge..................... 181
Cruise Control (Speed Control) .............. 133
Cup Holder ............................ 155
Customer Assistance ..................... 470
Data Recorder, Event ...................... 56
Daytime Running Lights ................... 125
Dealer Service .......................... 380
Defroster, Rear Window .................85,164
Defroster, Windshield ................74,236,238
Delay (Intermittent) Wipers ................. 129
Diesel Fuel ............................ 318
Diesel Fuel Requirements .................. 318
Differential, Limited-Slip .................. 287
Dipsticks .............................. 383
Power Steering ........................ 397
Disc Brakes ............................ 409
Disposal .............................. 389
Engine Oil ........................... 389 Used Coolant (Antifreeze)
................ 406
Door Ajar ............................. 187
Door Locks ............................. 24
Door Opener, Garage ..................... 143
Draining Fuel/Water Separator Filter .......... 391
Drive Belts ............................ 389
Dual Rear Wheels ..................... 316,364
DVD Player (Video Entertainment System) ...... 226
Electric Rear Window Defrost .............85,164
Electrical Power Outlets ................... 152
Electronic Speed Control (Cruise Control) ...... 133
Electronically Shifted Transfer Case ........... 280
Emergency Brake ........................ 290
Emergency, In Case of Freeing Vehicle When Stuck ............... 370
Hazard Warning Flasher ................. 354
Jacking ............................. 357
Jump Starting ......................... 367
INDEX 481
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Tow Hooks.......................... 371
Towing ............................. 372
Emission Control System Maintenance ......... 450
Engine ............................... 378
Air Cleaner .......................... 389
Block Heater ....................... 254,261
Break-In Recommendations ................ 71
Compartment ......................... 378
Coolant (Antifreeze) .................... 446
Cooling ............................. 401
Data Plate ........................... 380
Identification ......................... 378
Idling .............................. 263
Jump Starting ......................... 367
Oil .............................. 383,446
Oil Synthetic ......................... 262
Runaway ............................ 317
Temperature Gauge ..................... 181
Event Data Recorder ...................... 56 Exhaust Gas Caution
................73,172,401
Exhaust System ................. 73,400,401,418
Exterior Lighting ........................ 124
Fan .................................. 407
Filters Engine Oil ..................... 383,386,446
Flashers Turn Signal .......................... 127
Flat Tire Stowage ..................... 356,366
Fluid, Brake ........................... 447
Fluid Capacities ......................... 445
Fluid Level Checks Brake ............................... 409
Manual Transmission ................... 412
Power Steering ........................ 397
Transfer Case ......................... 412
Fluids, Lubricants and Genuine Parts .......... 446
Fog Lights ....................... 126,185,436
482 INDEX