2020 Ram 3500 open hood

SERVICING AND MAINTENANCE417
Under normal operating conditions, the
catalytic converter will not require
maintenance. However, it is important to keep
the engine properly tuned to ensure proper
catalyst operation and prevent possible catalyst
damage. NOTE:
Intentional tampering with emissions control
systems can result in civil penalties being
assessed against you.
In unusual situations involving grossly
malfunctioning engine operation, a scorching
odor may suggest severe and abnormal catalyst
overheating. If this occurs, stop the vehicle, turn
off the engine and allow it to cool. Service,
including a tune-up to manufacturer's
specifications, should be obtained immediately.
To minimize the possibility of catalytic converter
damage:
Do not interrupt the ignition when the trans
-
mission is in gear and the vehicle is in
motion.
Do not try to start the vehicle by pushing or
towing the vehicle.
Do not idle the engine with any ignition
components disconnected or removed, such
as when diagnostic testing, or for prolonged
periods during very rough idle or malfunc -
tioning operating conditions.
COOLING SYSTEM CAUTION!
The catalytic converter requires the use of
unleaded fuel only. Leaded gasoline will
destroy the effectiveness of the catalyst as
an emissions control device and may seri -
ously reduce engine performance and
cause serious damage to the engine.
Damage to the catalytic converter can
result if your vehicle is not kept in proper
operating condition. In the event of engine
malfunction, particularly involving engine
misfire or other apparent loss of perfor -
mance, have your vehicle serviced
promptly. Continued operation of your
vehicle with a severe malfunction could
cause the converter to overheat, resulting
in possible damage to the converter and
vehicle.
WARNING!
You or others can be badly burned by hot
engine coolant (antifreeze) or steam from
your radiator. If you see or hear steam
coming from under the hood, do not open
the hood until the radiator has had time to
cool. Never open a cooling system pressure
cap when the radiator or coolant bottle is
hot.
Keep hands, tools, clothing, and jewelry
away from the radiator cooling fan when
the hood is raised. The fan starts automati -
cally and may start at any time, whether the
engine is running or not.
When working near the radiator cooling fan,
disconnect the fan motor lead or turn the
ignition to the OFF mode. The fan is
temperature controlled and can start at any
time the ignition is in the ON mode.7

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SERVICING AND MAINTENANCE421
(Continued)
CHARGE AIR COOLER — INTER-COOLER
The charge air cooler is positioned below the
radiator and the air conditioner condenser. Air
enters the engine through the air cleaner and
passes through the turbocharger, 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°F
(10° to 38°C). 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 the hoses leading
to and from the charge air cooler for cracks or
loose clamps resulting in loss of pressure and
reduced engine performance.
BRAKE SYSTEM
In order to ensure brake system performance,
all brake system components should be
inspected periodically. Refer to the “Maintenance Plan” in this section for the
proper maintenance intervals.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be
checked when performing under the hood
service or immediately if the brake system
warning lamp indicates system failure.
If necessary, add fluid to bring level within the
designated marks on the side of the reservoir of
the brake master cylinder. Be sure to clean the
top of the master cylinder area before removing
cap.
With disc brakes the fluid level can be expected
to fall as the brake linings wear. However, an
unexpected drop in fluid level may be caused by
a leak and a system check should be
conducted.
Refer to “Fluids And Lubricants” in “Technical
Specifications” for further information.
WARNING!
Riding the brakes can lead to brake failure
and possibly a collision. Driving with your foot
resting or riding on the brake pedal can result
in abnormally high brake temperatures,
excessive lining wear, and possible brake
damage. You would not have your full braking
capacity in an emergency.
WARNING!

Use only manufacturer's recommended
brake fluid. Refer to “Fluids And Lubricants”
in “Technical Specifications” for further infor-
mation. Using the wrong type of brake fluid
can severely damage your brake system
and/or impair its performance. The proper
type of brake fluid for your vehicle is also
identified on the original factory installed
hydraulic master cylinder reservoir.
To avoid contamination from foreign matter
or moisture, use only new brake fluid or fluid
that has been in a tightly closed container.
Keep the master cylinder reservoir cap
secured at all times. Brake fluid in a open
container absorbs moisture from the air
resulting in a lower boiling point. This may
cause it to boil unexpectedly during hard or
prolonged braking, resulting in sudden brake
failure. This could result in a collision.
7

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555
Four-Way Hazard Flasher
............................... 346Freeing A Stuck Vehicle................................. 380Front Axle (Differential).................................. 424Fuel..................................................... 454, 456Adding............................................. 319, 320Additives................................................... 454Capacity.................................................... 460Clean Air.................................................... 454Diesel.............................................. 456, 464Ethanol...................................................... 454Filler Cap (Gas Cap)................................... 320Filter.......................................................... 409Gasoline.................................................... 454Light.......................................................... 135Materials Added........................................ 454Methanol................................................... 454Octane Rating................................. 454, 461Requirements........................ 454, 456, 459Specifications............................................ 457Tank Capacity............................................ 459Fueling........................................................... 320Fuses............................................................. 358
G
Garage Door Opener (HomeLink).................... 76Gas Cap (Fuel Filler Cap)............................... 320Gasoline, Clean Air........................................ 454Gasoline, Reformulated................................. 454Gauges Voltage...................................................... 223
Gear Ranges................................................. 240Gear Selector Override................................. 377Glass Cleaning.............................................. 451Gross Axle Weight Rating.............................. 326Gross Vehicle Weight Rating......................... 325GuideBody Builders.............................................. 12GVWR............................................................ 324
H
HazardDriving Through Flowing, Rising, Or Shallow Standing Water
....................... 343Hazard Warning Flashers.............................. 346Head Restraints............................................... 38Head Rests...................................................... 38Headlights.................................................... 353Automatic High Beam.................................. 49Cleaning................................................... 447High Beam................................................... 49Lights On Reminder..................................... 51Passing........................................................ 50Switch.......................................................... 48Heated Mirrors................................................. 46Heater, Engine Block.................................... 229Hill Descent Control...................................... 149Hill Descent Control Indicator....................... 149Hill Start Assist.............................................. 151HitchesTrailer Towing........................................... 329
Hoisting......................................................... 429HomeLink (Garage Door Opener).....................76Hood Prop........................................................74Hood Release...................................................74Hub Caps...................................................... 374
I
Idle-Up Feature............................................. 226Ignition.............................................................17Switch..........................................................17Illuminated Entry..............................................54In Vehicle HelpVehicle User Guide......................................13Inside Rearview Mirror.................... 42, 43, 346Instrument Cluster............................... 110, 112Descriptions.............................................. 141Display...................................................... 113Engine Oil Reset....................................... 115Instrument Panel Lens Cleaning................... 451Integrated Trailer Brake Control.................... 332Interior Appearance Care.............................. 450Interior Lights...................................................53Intermittent Wipers (Delay Wipers)..................55Intervention Regeneration Strategy..... 125, 413Introduction.....................................................11Inverter Outlet (115V)......................................88iPod/USB/MP3 Control................................. 53811

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560 Inflation Pressure
...................................... 436Life Of Tires............................................... 439Load Capacity.................................. 433, 434
Pressure Monitoring System (TPMS)... 136, 163
Quality Grading.......................................... 446Radial........................................................ 437Replacement............................................. 439Rotation.................................................... 444Safety.............................................. 429, 435Sizes.......................................................... 430Snow Tires................................................. 440Spare Tires...................................... 441, 442Spinning.................................................... 438Trailer Towing............................................ 331Tread Wear Indicators............................... 438Wheel Nut Torque..................................... 452To Open Hood.................................................. 74Tongue Weight/Trailer Weight....................... 330Tonneau Cover.................................... 100, 448Tonneau Cover Cleaning................................ 448Torque Converter Clutch................................ 245
Towing................................................. 325, 381Disabled Vehicle....................................... 381Guide........................................................ 330Recreational............................................. 339Weight...................................................... 330Towing Behind A Motorhome........................ 339Traction......................................................... 343Traction Control............................................ 153Trailer Sway Control (TSC)............................. 153Trailer Towing............................................... 325Cooling System Tips................................. 336Hitches..................................................... 329Minimum Requirements........................... 330Mirrors......................................................... 46Tips........................................................... 335Trailer And Tongue Weight........................ 330Wiring....................................................... 334Trailer Towing Guide..................................... 330Trailer Weight................................................ 330Transfer Case............................................... 425Electronically Shifted....................... 246, 250Fluid................................................ 463, 466
Transmission................................................. 235Automatic............................... 235, 239, 422Fluid................................................. 463, 466Maintenance............................................ 422Shifting..................................................... 233Transporting Pets.......................................... 209Tread Wear Indicators................................... 438Turn Signals......................... 51, 141, 353, 355
U
UconnectUconnect Settings
.......................... 476, 478,494, 497, 514, 516Uconnect PhoneCall Continuation...................................... 537Uconnect SettingsCustomer Programmable Features... 28, 476, 478, 494, 497, 514, 516Passive Entry Programming............... 28, 476, 494, 514Uconnect Voice Command............................ 541Uniform Tire Quality Grades.......................... 446

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