2020 Ram 3500 cooling

5
SAFETY
SAFETY FEATURES ............................................ 144Anti-Lock Brake System (ABS) ................. 144
Electronic Brake Control (EBC) System ....145
AUXILIARY DRIVING SYSTEMS ........................ 153
Blind Spot Monitoring (BSM) —
If Equipped ................................................153 Forward Collision Warning (FCW) With
Mitigation — If Equipped............................160
Tire Pressure Monitoring System (TPMS) .. 163

OCCUPANT RESTRAINT SYSTEMS .................. 172
Occupant Restraint Systems Features ....172
Important Safety Precautions ...................172Seat Belt Systems ..................................... 173Supplemental Restraint Systems (SRS) ...182Child Restraints .........................................191
Transporting Pets ......................................209
SAFETY TIPS ...................................................... 209
Transporting Passengers ..........................209
Exhaust Gas ...............................................209Safety Checks You Should Make
Inside The Vehicle ..................................... 210 Periodic Safety Checks You Should
Make Outside The Vehicle ........................ 212
STARTING AND OPERATING
STARTING THE ENGINE — GAS ENGINE .........213
Automatic Transmission............................ 213
Tip Start Feature ....................................... 213Keyless Enter-N-Go — Ignition ................... 214
Normal Starting Using ENGINE
START/STOP Button ................................. 214 Cold Weather Operation (Below –22°F
Or −30°C) .................................................. 217 After Starting .............................................. 217
STARTING THE ENGINE — DIESEL ENGINE ..... 217
Automatic Transmission............................ 217
Keyless Enter-N-Go — Ignition ................... 218
Extreme Cold Weather .............................. 220
Normal Starting Procedure —
Engine Manifold Air Temperature
Above 66° F (19° C) ................................. 220 Starting Procedure —
Engine Manifold Air Temperature 0°F To
66°F (–18°C to 19°C) ............................. 221 Starting Procedure — Engine Manifold Air
Temperature Below 0°F (-18°C) .............. 222 Starting Fluids ............................................ 223 NORMAL OPERATION — DIESEL ENGINE ....... 223
Cold Weather Precautions ........................ 223
Engine Idling ............................................. 226
Noise .......................................................... 227
Stopping The Engine ................................. 227Idle Shutdown ............................................ 228
Programmable Maximum Vehicle Speed ... 228

Operating Precautions .............................. 228
Cooling System Tips .................................. 228
ENGINE BLOCK HEATER — GAS ENGINE
(IF EQUIPPED) .................................................... 229
ENGINE BLOCK HEATER — DIESEL ENGINE
(IF EQUIPPED) ................................................... 229
Block Heater Usage ................................... 230
ENGINE BREAK-IN RECOMMENDATIONS —
GAS ENGINE ....................................................... 230
ENGINE BREAK-IN RECOMMENDATIONS —
DIESEL ENGINE .................................................. 230
PARKING BRAKE .............................................. 231
DIESEL EXHAUST BRAKE — ENGINE
BRAKING (IF EQUIPPED) .................................. 232

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9
Windshield Wiper Blades ..........................414
Exhaust System ........................................416
Cooling System .........................................417
Charge Air Cooler — Inter-Cooler ..............421
Brake System ............................................421
Automatic Transmission ............................422
Rear Axle And 4x4 Front Driving Axle
Fluid Level .................................................. 424 Transfer Case ............................................425
Noise Control System Required
Maintenance & Warranty .........................425
HOISTING ........................................................... 429
TIRES ................................................................... 429
Tire Safety Information .............................429Tires — General Information .....................435Tire Types ...................................................440
Spare Tires — If Equipped .........................441
Wheel And Wheel Trim Care ....................442
Tire Chains And Traction Devices ............443
Tire Rotation Recommendations .............444 DEPARTMENT OF TRANSPORTATION
UNIFORM TIRE QUALITY GRADES .................. 446
Treadwear .................................................. 446
Traction Grades ......................................... 446
Temperature Grades ................................. 446
STORING THE VEHICLE .....................................447
BODYWORK ........................................................ 447
Protection From Atmospheric Agents....... 447
Body And Underbody Maintenance .......... 447Preserving The Bodywork .......................... 448
INTERIORS ......................................................... 450
Seats And Fabric Parts .............................. 450
Plastic And Coated Parts ........................... 450
Leather Parts ............................................. 451
Glass Surfaces .......................................... 451
TECHNICAL SPECIFICATIONS
IDENTIFICATION DATA .......................................452Vehicle Identification Number ................. 452
BRAKE SYSTEM ................................................. 452
Hydraulic Brake Assist — If Equipped ....... 452

WHEEL AND TIRE TORQUE SPECIFICATIONS ... 452

Torque Specifications ............................... 452 FUEL REQUIREMENTS — GAS ENGINE ............ 454
6.4L Engine ................................................ 454
Reformulated Gasoline ............................ 454Materials Added To Fuel ........................... 454
Gasoline/Oxygenate Blends ..................... 454
Do Not Use E-85 In Non-Flex Fuel
Vehicles ...................................................... 455 CNG And LP Fuel System Modifications .. 455MMT In Gasoline........................................ 455
Fuel System Cautions................................ 455
Carbon Monoxide Warnings ..................... 456
FUEL REQUIREMENTS – DIESEL ENGINE ....... 456
Fuel Specifications ................................... 457
Biodiesel Fuel Requirements.................... 457
FLUID CAPACITIES — GAS ENGINE ................. 459
FLUID CAPACITIES — DIESEL ENGINE............. 460
FLUIDS AND LUBRICANTS — GAS ENGINE..... 461 Engine ....................................................... 461
Chassis ...................................................... 463

FLUIDS AND LUBRICANTS — DIESEL ENGINE ...464

Engine ....................................................... 464
Chassis ....................................................... 466

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GETTING TO KNOW YOUR VEHICLE67
CLIMATE CONTROL FUNCTIONS
A/C (Air Conditioning)
The Air Conditioning (A/C) button allows the
operator to manually activate or deactivate the
air conditioning system. When the air
conditioning system is turned on, cool
dehumidified air will flow through the outlets
into the cabin. For improved fuel economy,
press the A/C button to turn off the air
conditioning and manually adjust the blower
and airflow mode settings. Also, make sure to
select only Panel, Bi-Level, or Floor modes.
NOTE:
For Manual Climate Controls, if the system is
in Mix, Floor or Defrost Mode, the A/C can be
turned off, but the A/C system shall remain
active to prevent fogging of the windows.
If fog or mist appears on the windshield or
side glass, select Defrost mode, and increase
blower speed if needed.
If your air conditioning performance seems
lower than expected, check the front of the
A/C condenser (located in front of the radi -
ator), for an accumulation of dirt or insects.
Clean with a gentle water spray from the front
of the radiator and through the condenser. MAX A/C
MAX A/C sets the control for maximum cooling
performance.
Press and release to toggle between MAX A/C
and the prior settings. The button illuminates
when MAX A/C is on.
In MAX A/C, the blower level and mode position
can be adjusted to desired user settings.
Pressing other settings will cause the MAX A/C
operation to switch to the selected setting and
MAX A/C to exit.
Recirculation
In cold weather, use of Recirculation mode may
lead to excessive window fogging. The
Recirculation feature may be unavailable
(button on the touchscreen greyed out) if
conditions exist that could create fogging on the
inside of the windshield.
On systems with Manual Climate Controls, if
equipped, the Recirculation mode is not
allowed in Defrost mode to improve window
clearing operation. Recirculation is disabled
automatically if this mode is selected.
Attempting to use Recirculation while in this
mode causes the LED in the control button to
blink and then turns off.
AUTOMATIC TEMPERATURE CONTROL
(ATC)
Automatic Operation

1. Push the AUTO button on the faceplate, or
the AUTO button on the touchscreen on the
Automatic Temperature Control (ATC)
Panel.

2. Next, adjust the temperature you would like the system to maintain by adjusting the
driver and passenger temperature control
buttons. Once the desired temperature is
displayed, the system will achieve and
automatically maintain that comfort level.
3. When the system is set up for your comfort level, it is not necessary to change the
settings. You will experience the greatest
efficiency by simply allowing the system to
function automatically.2

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68GETTING TO KNOW YOUR VEHICLE
(Continued)
NOTE:
It is not necessary to move the temperature
settings for cold or hot vehicles. The system
automatically adjusts the temperature,
mode, and blower speed to provide comfort
as quickly as possible.
The temperature can be displayed in U.S. or
Metric units by selecting the U.S./Metric
customer-programmable feature. Refer to
the “Uconnect Settings” in “Multimedia” for
further information.
To provide you with maximum comfort in the
Automatic mode during cold start-ups, the
blower fan will remain on low until the engine
warms up. The blower will increase in speed
and transition into Auto mode.
Manual Operation Override
This system offers a full complement of manual
override features. The AUTO symbol in the front
ATC display will be turned off when the system
is being used in the manual mode.
OPERATING TIPS
NOTE:
Refer to the chart at the end of this section for
suggested control settings for various weather
conditions.
Summer Operation
The engine cooling system must be protected
with a high-quality antifreeze coolant to provide
proper corrosion protection and to protect
against engine overheating. OAT coolant
(conforming to MS.90032) is recommended.
Winter Operation
To ensure the best possible heater and
defroster performance, make sure the engine
cooling system is functioning properly and the
proper amount, type, and concentration of
coolant is used. Use of the Air Recirculation
mode during Winter months is not
recommended, because it may cause window
fogging.
Vacation/Storage
Before you store your vehicle, or keep it out of
service (i.e., vacation) for two weeks or more,
run the air conditioning system at idle for about
five minutes, in fresh air with the blower setting
on high. This will ensure adequate system
lubrication to minimize the possibility of
compressor damage when the system is started
again.
Window Fogging
Vehicle windows tend to fog on the inside in
mild, rainy, and/or humid weather. To clear the
windows, select Defrost or Mix mode and
increase the front blower speed. Do not use the
Recirculation mode without A/C for long
periods, as fogging may occur.
CAUTION!
Failure to follow these cautions can cause
damage to the heating elements:

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GETTING TO KNOW YOUR INSTRUMENT PANEL107
3. Instrument Cluster Display
When the appropriate conditions exist,
this display shows the instrument cluster
display messages. Refer to “Instrument
Cluster Display” in “Getting To Know Your
Instrument Panel” for further informa-
tion.
4. Oil Pressure Gauge
The pointer should always indicate the oil
pressure when the engine is running. A
continuous high or low reading under
normal driving conditions may indicate a
lubrication system malfunction. Imme -
diate service should be obtained from an
authorized dealer.
5. Speedometer
Indicates vehicle speed.
6. Fuel Gauge
The pointer shows the level of fuel in the
fuel tank when the ignition is in the ON/
RUN position.
 The fuel pump symbol points
to the side of the vehicle where
the fuel door is located.
Refer to “Refueling The Vehicle — Gas
Engine” in “Starting And Operating” for
further information.
7. Temperature Gauge
The gauge pointer shows engine coolant
temperature. The pointer positioned
within the normal range indicates that
the engine cooling system is operating
satisfactorily.
The gauge pointer will likely indicate a
higher temperature 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.
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, refer to the warnings under
“Cooling System Pressure Cap” in see
“Servicing And Maintenance” for further
information.
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,” turn the engine off
immediately and call an authorized dealer for
service.
3

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GETTING TO KNOW YOUR INSTRUMENT PANEL109
 The fuel pump symbol points
to the side of the vehicle where
the fuel door is located.
Refer to “Refueling The Vehicle — Gas
Engine” in “Starting And Operating” for
further information.
5. Temperature Gauge
The gauge pointer shows engine coolant
temperature. The pointer positioned
within the normal range indicates that
the engine cooling system is operating
satisfactorily.
The gauge pointer will likely indicate a
higher temperature 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.
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, refer to the warnings under
“Cooling System Pressure Cap” in see
“Servicing And Maintenance” for further
information.
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,” turn the engine off
immediately and call an authorized dealer for
service.
3

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GETTING TO KNOW YOUR INSTRUMENT PANEL111
3. Instrument Cluster Display
When the appropriate conditions exist,
this display shows the instrument cluster
display messages. Refer to “Instrument
Cluster Display” in “Getting To Know Your
Instrument Panel” for further informa-
tion. 4. Oil Pressure Gauge
The pointer should always indicate some
oil pressure when the engine is running.
A continuous high or low reading under
normal driving conditions may indicate a
lubrication system malfunction. Imme
-
diate service should be obtained from an
authorized dealer.
5. Speedometer
Indicates vehicle speed.
6. Fuel Gauge
The pointer shows the level of fuel in the
fuel tank when the ignition switch is in
the ON/RUN position.
 The fuel pump symbol points
to the side of the vehicle where
the fuel filler door is located.
Refer to “Refueling The Vehicle — Gas
Engine” in “Starting And Operating” for
further information.
7. Diesel Exhaust Fluid (DEF) Gauge
The DEF Gauge displays the actual level
of Diesel Exhaust Fluid in the DEF tank.
Diesel Exhaust Fluid (DEF) is required to maintain normal vehicle operation and
emissions compliance. If something is
wrong with the gauge, a DEF Warning
Message or Malfunction Indicator Light
(MIL) will be displayed. More information
is available in the instrument cluster
display section under the heading of
Diesel Exhaust Fluid (DEF) Warning
Messages.
NOTE:
The gauge may take up to five seconds to
update after adding a gallon or more of
Diesel Exhaust Fluid (DEF) to the DEF tank. If
you have a fault related to the DEF system,
the gauge may not update to the new level.
See an authorized dealer for service.
The DEF gauge may also not immediately
update after a refill if the temperature of the
DEF fluid is below 39°F (4°C). The DEF tank
heater will warm up the DEF fluid and allow
the gauge to update after a period of run
time. Under very cold conditions, it is possible
that the gauge may not reflect the new fill
level for several drives.
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.
CAUTION!
Driving with a hot engine cooling system
could damage your vehicle. If the
temperature gauge reads greater “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,” turn the
engine off immediately and call an authorized
dealer for service.
3

20_DJD2_OM_EN_USC_t.book Page 111

210SAFETY
The best protection against carbon monoxide
entry into the vehicle body is a properly
maintained engine exhaust system.
Whenever a change is noticed in the sound of
the exhaust system, when exhaust fumes can
be detected inside the vehicle, or when the
underside or rear of the vehicle is damaged,
have a competent mechanic inspect the
complete exhaust system and adjacent body
areas for broken, damaged, deteriorated, or
mispositioned parts. Open seams or loose
connections could permit exhaust fumes to
seep into the passenger compartment. In
addition, inspect the exhaust system each time
the vehicle is raised for lubrication or oil
change. Replace as required.
SAFETY CHECKS YOU SHOULD MAKE
I
NSIDE THE VEHICLE
Seat Belts
Inspect the seat belt system periodically,
checking for cuts, frays, and loose parts.
Damaged parts must be replaced immediately.
Do not disassemble or modify the system.
Front seat belt assemblies must be replaced
after a collision. Rear seat belt assemblies must
be replaced after a collision if they have been
damaged (i.e., bent retractor, torn webbing,
etc.). If there is any question regarding seat belt
or retractor condition, replace the seat belt.
Air Bag Warning Light
The Air Bag warning light will turn on for four
to eight seconds as a bulb check when the
ignition switch is first turned to ON/RUN. If the
light is either not on during starting, stays on, or
turns on while driving, have the system
inspected at an authorized dealer as soon as
possible. After the bulb check, this light will
illuminate with a single chime when a fault with the Air Bag System has been detected. It will
stay on until the fault is removed. If the light
comes on intermittently or remains on while
driving, have an authorized dealer service the
vehicle immediately.
Refer to “Occupant Restraint Systems” in
“Safety” for further information.
Defroster
Check operation by selecting the defrost mode
and place the blower control on high speed. You
should be able to feel the air directed against
the windshield. See an authorized dealer for
service if your defroster is inoperable.
Floor Mat Safety Information
Always use floor mats designed to fit your
vehicle. Only use a floor mat that does not
interfere with the operation of the accelerator,
brake or clutch pedals. Only use a floor mat that
is securely attached using the floor mat
fasteners so it cannot slip out of position and
interfere with the accelerator, brake or clutch
pedals or impair safe operation of your vehicle
in other ways.
If it is necessary to sit in a parked vehicle
with the engine running, adjust your
heating or cooling controls to force outside
air into the vehicle. Set the blower at high
speed.
WARNING!
(Continued)

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