engine DODGE RAM 2500 DIESEL 2009 4.G Service Manual

Dual Zone Temperature ControlUse this control to regulate the temperature of the air
inside the passenger compartment. This is accomplished
by having separate temperature control slides for both
the driver and front passenger. The blue area of the scaleindicates cooler temperatures while the red area indicates
warmer temperatures.
CirculationThe cab is designed with features to promote outside air
circulation. There are grilles in the cab back panel. These
are air exhausters that provide the means for regular
exchange of cab air.
Side window demisters direct airflow specifically to the
window glass to help prevent interior fogging of the
glass. They are located in the extreme outside upper
edges of the instrument panel. The demisters also pro-
vide extra air ducts for circulation. They are in operation
whenever the Floor, Mix or Defrost modes are in use.
NOTE:
When you turn off the engine you may hear a
hissing sound from under the hood for a short period of
time. This is a normal condition that occurs if the air
conditioning system has been on. It is not an indication of
a problem with the air conditioning system.
Dual Zone Temperature Control
UNDERSTANDING YOUR INSTRUMENT PANEL 243
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Summer OperationAir conditioned vehicles must be protected with a high
quality antifreeze coolant during summer to provide
proper corrosion protection and to raise the boiling point
of the coolant for protection against overheating. A 50 %
concentration is recommended. For proper coolant type,
refer to “Recommended Fluids and Genuine Parts” in
Section 7.
When using the air conditioner in extremely heavy traffic
in hot weather, especially when towing a trailer, addi-
tional engine cooling may be required. If this situation is
encountered, operate the transmission in a lower gear to
increase engine RPM, coolant flow and fan speed. When
stopped in heavy traffic, it may be necessary to shift into
NEUTRAL and depress the accelerator slightly for fast
idle operation to increase coolant flow and fan speed.NOTE:
On models equipped with Diesel engines, the
idle speed will automatically increase to 1000 rpm at
elevated coolant temperatures to improve engine cooling.
Your air conditioning system is also equipped with an
automatic recirculation system. When the system senses
a heavy load or high heat conditions, it may use partial
Recirculation A/C mode to provide additional comfort.
Winter OperationWhen operating the system during the Winter months,
make sure the air intake, located directly in front of the
windshield, is free of ice, slush, snow, or other obstructions.
UNDERSTANDING YOUR INSTRUMENT PANEL 245
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STARTING AND OPERATING
CONTENTSStarting Procedures .................... 252
▫ Normal Starting ..................... 252
▫ Automatic Transmission ............... 252
▫ If Engine Fails To Start ................ 252
▫ After Starting ....................... 254
 Engine Block Heater — If Equipped ........ 254
 Automatic Transmission ................. 254
▫ Automatic Transmission With Overdrive .... 255
Four-Wheel Drive Operation — If Equipped
... 260
▫ Manually Shifted Transfer Case Operating
Information/Precautions ............... 260
▫ Shifting Procedure - Manually Shifted
Transfer Case ....................... 263
▫ Transfer Case Position Indicator Light ...... 264
▫ Electronically Shifted Transfer Case
Operating Information/Precautions (Five
Position Switch) — If Equipped .......... 264
▫ Shifting Procedure — Electronically Shifted
Transfer Case ....................... 269
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STARTING PROCEDURESBefore starting your vehicle, adjust your seat, adjust both
inside and outside mirrors, and fasten your seat belts.
The starter should not be operated for more than 15-
second intervals. Waiting a few seconds between such
intervals will protect the starter from overheating.
WARNING!
Do not leave children or animals inside parked
vehicles in hot weather. Interior heat buildup may
cause serious injury or death.Normal StartingNormal starting of either a warm or cold engine is
obtained without pumping or depressing the accelerator
pedal. Turn the key to the START position and release
when the engine starts. If the engine fails to start within
10 seconds, turn the key to the OFF position, wait five
seconds, then repeat the starting procedure.
Automatic TransmissionStart the engine with the shift lever in the NEUTRAL or
PARK position. Apply the brake before shifting to any
driving range.
NOTE: This vehicle is equipped with a transmission
shift interlocking system. The brake pedal must be
depressed to shift out of PARK.Tip Start FeatureDo notpress the accelerator. Turn the ignition key briefly
to START position, and release it. The starter motor will
continue to run, but will automatically disengage when
the engine is running.If Engine Fails To StartIf the engine fails to start after you have followed the
“Normal Starting” procedure, it may be flooded. Push
the accelerator pedal all the way to the floor and hold it
there while cranking the engine. This should clear any
excess fuel in case the engine is flooded.
252 STARTING AND OPERATING

CAUTION!
To prevent damage to the starter, do not crank the
engine for more than 15 seconds at a time. Wait 10 to
15 seconds before trying again.
WARNING!
•
Never pour fuel or other flammable liquids into
the throttle body air inlet opening in an attempt to
start the vehicle. This could result in a flash fire
causing serious personal injury.
•
Do not attempt to push or tow your vehicle to get
it started. Vehicles equipped with an automatic
transmission cannot be started this way. Unburned
fuel could enter the catalytic converter and once
the engine has started, ignite and damage the
converter and vehicle.(Continued)
WARNING! (Continued)
•
If the vehicle has a discharged battery, booster
cables may be used to obtain a start from a booster
battery or the battery in another vehicle. This type
of start can be dangerous if done improperly. Refer
to “Jump Starting” in Section 6.
If the engine has been flooded, it may start to run, but not
have enough power to continue running when the key is
released. If this occurs, continue cranking with the accel-
erator pedal pushed all the way to the floor. Release the
accelerator pedal and the key once the engine is running
smoothly.
If the engine shows no sign of starting after two 15-
second periods of cranking with the accelerator pedal
held to the floor, the “Normal Starting” procedure should
be repeated.
STARTING AND OPERATING 253
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After StartingThe idle speed is automatically controlled and will de-
crease as the engine warms up.ENGINE BLOCK HEATER — IF EQUIPPEDThe engine block heater warms the engine, and permits
quicker starts in cold weather. Connect the cord to a
standard 110-115 Volt AC electrical outlet with a
grounded, three-wire extension cord.
The engine block heater cord is routed under the hood on
the driver side of the vehicle. It has a removable cap that
is located on the driver’s side of the Integrated Power
Module.
WARNING!
Remember to disconnect the cord before driving.
Damage to the 110-115 Volt electrical cord could cause
electrocution.
AUTOMATIC TRANSMISSION
CAUTION!
Damage to the transmission may occur if the follow-
ing precautions are not observed:•
Shift into PARK only after the vehicle has come to
a complete stop.
•
Shift into or out of REVERSE only after the
vehicle has come to a complete stop and the engine
is at idle speed.
•
Do not shift from REVERSE, PARK, or NEUTRAL
into any forward gear when the engine is above
idle speed.
•
Before shifting into any gear, make sure your foot
is firmly on the brake pedal.
254 STARTING AND OPERATING

WARNING!
It is dangerous to move the shift lever out of PARK or
NEUTRAL if the engine speed is higher than idle
speed. If your foot is not firmly on the brake pedal,
the vehicle could accelerate quickly forward or in
reverse. You could lose control of the vehicle and hit
someone or something. Only shift into gear when the
engine is idling normally and when your right foot is
firmly on the brake pedal.Automatic Transmission with OverdriveThe gear shift lever display located in the instrument
panel cluster indicates the transmission gear range (the
selector is illuminated for night driving). The shift lever is
mounted on the right side of the steering column. You
must depress the brake pedal to pull the shift lever out of
PARK position (Brake Interlock System). To drive, move
the shift lever from PARK or NEUTRAL to the desiredDRIVE position. Pull the shift lever toward you when
shifting into REVERSE, SECOND, FIRST or PARK, or
when shifting out of PARK.
Gear RangesDO NOT race the engine when shifting from PARK or
NEUTRAL position into another gear range.
PARK
This gear position supplements the parking brake by
locking the transmission. The engine can be started in
this range. Never use PARK while the vehicle is in
motion. Apply the parking brake when leaving the
vehicle in this range. Always apply parking brake first,
then place the shift lever into the PARK position. On
four-wheel drive vehicles be sure that the transfer case is
in a drive position!
STARTING AND OPERATING 255
5

WARNING!
•
Never use the PARK position as a substitute for
the parking brake. Always apply parking brake
fully when parked to guard against vehicle move-
ment and possible injury or damage.
•
Your vehicle could move and injure you and others
if it is not completely in PARK. Check by trying to
move the shift lever back and forth without first
pulling it toward you after you have set it in
PARK. Make sure it is in PARK before leaving the
vehicle.(Continued)
WARNING! (Continued)
•
It is dangerous to move the shift lever out of PARK
or NEUTRAL if the engine speed is higher than
idle speed. If your foot is not firmly on the brake
pedal, the vehicle could accelerate quickly forward
or in reverse. You could lose control of the vehicle
and hit someone or something. Only shift into
gear when the engine is idling normally and when
your right foot is firmly on the brake pedal.
REVERSE
Use this range only after the vehicle has come to a
complete stop.
NEUTRAL
Shift into NEUTRAL when the vehicle is standing for
prolonged periods with the engine running. The engine
may be started in this range. Set the parking brake if you
must leave the vehicle.
256 STARTING AND OPERATING

DRIVE
This position provides all forward gears, including 3rd
gear direct and 4th or 5th gear overdrive (see Overdrive
Operation). Use this range for most city and highway
driving.
SECOND
Use this position for driving slowly in heavy city traffic
or on mountain roads where more precise speed control
is desirable. Use it also when climbing long grades, and
for engine braking when descending moderately steep
grades. To prevent excessive engine speed do not exceed
45 mph (72 km/h) in this range.
FIRST
Use this position for driving up very steep hills and for
engine braking at low speeds 20 mph (32 km/h) or less
when going downhill. To prevent excessive engine speed,
do not exceed 25 mph (40 km/h) in this range.NOTE:
Use caution when operating a heavily loaded
vehicle in SECOND or FIRST gear selections in high
ambients as torque converter slip can impose significant
additional heat load on the cooling system.
Overdrive OperationThe overdrive automatic transmission contains an elec-
tronically controlled fourth and fifth (if equipped) speed
(Overdrive). The transmission will automatically shift
from DRIVE to Overdrive if the following conditions are
present:•
the shift lever is in DRIVE;
•
the engine coolant has reached normal operating tem-
perature;
•
vehicle speed is above approximately 30 mph
(48 km/h);
•
the “TOW HAUL O/D OFF” switch has not been
activated;
STARTING AND OPERATING 257
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This will improve performance and reduce the potential
for transmission overheating or failure due to excessive
shifting. When operating in “TOW HAUL” mode, 5th
gear (if equipped) is disabled and 2-3 and 3-4 shift
patterns are modified. Shifts into Overdrive (4th gear) are
allowed during steady cruise (for improved fueleconomy) and automatic closed-throttle downshifts to
3rd gear are performed (for improved braking) when
driving conditions warrant. Pressing the “TOW HAUL
O/D OFF” button a second time to select O/D OFF will
disable 4th and 5th gear completely, which should elimi-
nate any excessive transmission shifting.
The “TOW HAUL” or “O/D OFF” light will illuminate in
the instrument cluster to indicate when the switch has
been activated. Pressing the switch a third time restores
normal operation. If the “TOW HAUL” or “O/D OFF”
modes are desired, the button must be pressed each time
the engine is started.
Torque Converter ClutchA feature, designed to improve fuel economy, has been
included in the automatic transmission on your vehicle.
A clutch within the torque converter engages automati-
cally at calibrated speeds. This may result in a slightly
different feeling or response during normal operation in
Tow Haul O/D Off Switch
STARTING AND OPERATING 259
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