2007 RAM CHASSIS CAB coolant temperature

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. MAINTAINING YOUR VEHICLE 429
7

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.
• Do not overfill the coolant recovery bottle.
• Check coolant freeze point in the radiator and in the
coolant recovery bottle. If antifreeze needs to be
added, contents of coolant recovery bottle must also be
protected against freezing.
• If frequent coolant additions are required, or if the
level in the coolant recovery bottle does not drop when
the engine cools, the cooling system should be pres-
sure tested for leaks.
• Maintain coolant concentration at 50% HOAT engine
coolant (minimum) and distilled water for proper
corrosion protection of your engine which contains
aluminum components. MAINTAINING YOUR VEHICLE 431
7

• Make sure that the radiator and coolant recovery
bottle overflow hoses are not kinked or obstructed.
• Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean, also.
• Do not change the thermostat for summer or winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory coolant performance, poor gas
mileage, and increased emissions.
Fan
Inspection
Check the fan for cracks and bent or broken blades. If any
of these conditions exist, you must replace the fan. Make
sure it is securely mounted. NOTE: This service procedure must be performed by a
trained service technician. Make arrangements with your
authorized Dodge Truck Dealer for this inspection.
Charge Air Cooler — Inter-Cooler (Diesel
Engines)
The charge air cooler is positioned between the radiator
and the air conditioner condenser. Air enters the engine
through the air cleaner and passes through the turbo-
charger where it is pressurized. This pressurized air
rapidly reaches high temperature. The air is then directed
through a hose to the charge air cooler and through
another hose to the intake manifold of the engine. The air
entering the engine has been cooled by about 50 to 100
degrees Fahrenheit. This cooling process enables more
efficient burning of fuel resulting in fewer emissions.
To guarantee optimum performance of the system, keep
the surfaces of the charge air cooler, condenser and
radiator clean and free of debris. Periodically check the432 MAINTAINING YOUR VEHICLE

Schedule “B”
Follow schedule “B” 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.
• Extensive engine idling.
• Driving in dusty conditions.
• Short trips of less than 10 miles (16 km).
• More than 50% of your driving is at sustained high
speeds during hot weather, above 90° F (32° C).
• Trailer towing.
• Snowplowing.
• Heavy Loading.
• Taxi, police, or delivery service (commercial service). • Off-road or desert operation.
• If equipped for and operating with E-85 (ethanol)
fuel.
NOTE: If ANY of these apply to you then change your
engine oil every 3,000 miles (5 000 km) or 3 months,
whichever comes first and follow schedule “B” of the
 Maintenance Schedules  section of this manual.
NOTE: If ANY of 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.
NOTE: If none of these apply to you, then change your
engine oil at every interval shown on schedule  A  of the
 Maintenance Schedules  section of this manual. SCHEDULE “B” 487
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Selection of Coolant (Antifreeze) ......... 428,469
Temperature Gauge ..................... 174
Cruise Control (Speed Control) .............. 132
CupHolder ............................ 152
Customer Assistance ..................... 504
Data Recorder, Event ...................... 57
Daytime Running Lights ................... 124
Dealer Service .......................... 395
Defroster, Rear Window ................. 86,160
Defroster, Windshield ................ 76, 232,234
Delay (Intermittent) Wipers ................. 128
Diesel Exhaust Brake ..................... 265
Diesel Fuel ............................ 331
Diesel Fuel Requirements .................. 331
Bulk Storage of ........................ 336
Differential, Limited-Slip .................. 295
Dipsticks .............................. 398
Power Steering ........................ 421 Disc Brakes ............................ 434
Disposal .............................. 405
Engine Oil ........................... 405
Used Coolant (Antifreeze) ................ 430
Door Ajar ............................. 180
Door Locks ............................. 26
Door Locks, Automatic .................... 145
Downshifting ........................ 281,282
Draining Fuel/Water Separator Filter .......... 410
DriveBelts ............................ 406
Dual Rear Wheels ..................... 326,378
DVD Player (Video Entertainment System) ...... 222
Electric Rear Window Defrost ............. 86,160
Electrical Power Outlets ................... 149
Electronic Speed Control (Cruise Control) ...... 132
Electronic Vehicle Information Center (EVIC) .... 142
Electronically Shifted Transfer Case ........... 288
Emergency Brake ........................ 299 INDEX 517
10

Emergency, In Case of
Freeing Vehicle When Stuck ............... 385
Hazard Warning Flasher ................. 370
Jacking ............................. 372
Jump Starting ......................... 382
Tow Hooks .......................... 386
Towing ............................. 387
Emission Control System Maintenance ......... 474
Emission Related Components .............. 418
Engine ............................ 392,393
Air Cleaner ........................ 406,407
Block Heater .................... 252,259,265
Break-In Recommendations ................ 72
Compartment ......................... 392
Compartment Identification ............... 393
Coolant (Antifreeze) .................... 469
Cooling ............................. 426
Data Plate ........................... 395
Exhaust Gas Caution .................... 330 Flooded, Starting ...................... 249
Identification ......................... 392
Idling .............................. 261
Jump Starting ......................... 382
Oil .............................. 398,469
Oil Filler Cap ...................... 401,403
Oil Selection .......................... 401
Oil Synthetic ....................... 260,403
Runaway ............................ 327
Temperature Gauge ..................... 174
Event Data Recorder ...................... 57
Exhaust Brake .......................... 265
Exhaust Gas Caution ................ 75, 330,425
Exhaust System .................... 75, 425,446
ExteriorLighting ........................ 124
Fabric Care ............................ 454
Fan .................................. 432518 INDEX

Gasoline (Fuel) ......................... 327
Gasoline, Reformulated ................... 328
Gauges ............................... 172
Coolant Temperature .................... 174
Fuel ................................ 179
Oil Pressure .......................... 174
Speedometer ......................... 173
Tachometer .......................... 173
Voltmeter ......................... 172,257
Gear Ranges ...................... 267,273,280
General Information .................... 18,112
Glass Cleaning .......................... 456
Grocery Bag Retainer ..................... 159
Gross Axle Weight Rating .................. 342
Gross Vehicle Weight Rating ................ 341
GVWR ............................... 338
Hands-Free Phone (UConnect™) .............. 87
Hazard Warning Flasher ................... 370 Head Restraints ......................... 115
Headlights ............................ 462
Cleaning ............................ 455
High Beam ........................... 127
High Beam/Low Beam Select Switch ........ 127
Lights On Reminder .................... 125
Passing ............................. 126
Switch .............................. 124
Heated Mirrors ....................... 86,160
Heated Seats ........................... 118
Heater ............................... 233
Heater, Engine Block ..................... 265
High Beam/Low Beam Select (Dimmer) Switch . . 127
Hitches
TrailerTowing ........................ 345
Hoisting .............................. 381
Hood Release .......................... 120
Hoses ................................ 433
Hub Caps ............................. 377520 INDEX