2021 RAM CHASSIS CAB air condition

6
SAFETY
SAFETY FEATURES ............................................ 273
Anti-Lock Brake System (ABS) ................. 273
Electronic Brake Control (EBC) System ...274
AUXILIARY DRIVING SYSTEMS ........................ 281
Forward Collision Warning (FCW) With
Mitigation — If Equipped............................281 Tire Pressure Monitoring
System (TPMS) ..........................................284
OCCUPANT RESTRAINT SYSTEMS .................. 292
Occupant Restraint Systems Features ....292
Important Safety Precautions ...................293Seat Belt Systems ..................................... 293Supplemental Restraint Systems (SRS) ...302Child Restraints..........................................312
SAFETY TIPS ...................................................... 330
Transporting Passengers ..........................330
Transporting Pets ......................................330
Safety Checks You Should Make Inside
The Vehicle ................................................330 Periodic Safety Checks You Should Make
Outside The Vehicle ...................................332 Exhaust Gas ...............................................333Carbon Monoxide Warnings ......................333
IN CASE OF EMERGENCY
HAZARD WARNING FLASHERS .......................334
ASSIST AND SOS SYSTEM — IF EQUIPPED..... 335
JACKING AND TIRE CHANGING ........................339
4500/5500 Models .................................. 339Preparations For Jacking........................... 339
Jacking Instructions 4500 And
5500 Series ............................................... 340 To Stow The Flat Or Spare —
If Equipped ................................................ 343 Hub Caps/Wheel Covers — If Equipped ... 343
JUMP STARTING ................................................ 344
Preparations For Jump Start ..................... 344Jump Starting Procedure .......................... 345
IF YOUR ENGINE OVERHEATS .........................346
GEAR SELECTOR OVERRIDE — 6–SPEED
TRANSMISSION ................................................. 347
MANUAL PARK RELEASE — 8 – SPEED
TRANSMISSION ................................................. 348
FREEING A STUCK VEHICLE .............................349
TOWING A DISABLED VEHICLE ........................350 Two-Wheel Drive Models ........................... 351
Four-Wheel Drive Models .......................... 351Emergency Tow Hooks — If Equipped ...... 352
ENHANCED ACCIDENT RESPONSE
SYSTEM (EARS) ................................................. 352
EVENT DATA RECORDER (EDR) .......................352
SERVICING AND MAINTENANCE
SCHEDULED SERVICING — GASOLINE
ENGINE ................................................................ 353
Maintenance Plan ..................................... 354
SCHEDULED SERVICING — DIESEL ENGINE .. 357
Oil Change Indicator System — Cummins
Diesel.......................................................... 357 Perform Service Indicator — Cummins
Diesel ......................................................... 358 Maintenance Plan — Cummins Diesel
Engine ....................................................... 359
ENGINE COMPARTMENT .................................. 364
6.4L Engine ............................................... 364
6.7L Engine ................................................ 365
Checking Oil Level ..................................... 366
Adding Washer Fluid ................................. 366Maintenance-Free Battery ....................... 366Pressure Washing...................................... 367
VEHICLE MAINTENANCE .................................. 367
Engine Oil .................................................. 368
Engine Oil Filter.......................................... 369
Engine Air Cleaner Filter ........................... 369
Air Conditioner Maintenance ................... 371
Accessory Drive Belt Inspection ............... 374Draining Fuel/Water Separator Filter....... 375Engine Mounted Fuel Filter
Replacement.............................................. 376

21_DPF_OM_EN_USC_t.book Page 6

22GETTING TO KNOW YOUR VEHICLE
Automatic Temperature Control (ATC) — If
Equipped
The climate controls automatically adjust to an
optimal temperature and mode, dependent on
the outside ambient temperature. When the
ignition is placed in the ON/RUN position, the
climate controls will resume their previous
settings.
Manual Temperature Control (MTC) — If
Equipped
In ambient temperatures of 40°F (4.5°C) or
below, the climate settings will default to
maximum heat, with fresh air entering the
cabin. If the front defrost timer expires, the
vehicle will enter Mix Mode.
In ambient temperatures from 40°F (4.5°C)
to 78°F (26°C), the climate settings will be
based on the last settings selected by the
driver.

In ambient temperatures of 78°F (26°C) or
above, the climate settings will default to MAX
A/C, Bi-Level mode, with Recirculation on.

For more information on ATC, MTC, and climate
control settings, see Ú page 58. NOTE:
These features will stay on through the duration
of remote start, or until the ignition is placed in
the ON/RUN position. The climate control
settings will change, and exit the automatic
defaults, if manually adjusted by the driver
while the vehicle is in remote start mode.
This includes turning the climate controls off
using the OFF button.
REMOTE START ABORT MESSAGE
The following messages will display in the
instrument cluster display if the vehicle fails to
remote start or exits remote start prematurely:
Remote Start Cancelled — Door Open
Remote Start Cancelled — Hood Open
Remote Start Cancelled — Fuel Low
Remote Start Cancelled — System Fault

Remote Start Disabled — Start Vehicle to Reset

The instrument cluster display message stays
active until the ignition is placed in the ON/RUN
position.
REMOTE START — IF EQUIPPED (DIESEL)
This system uses the key fob to start
the engine conveniently from outside
the vehicle while still maintaining
security. The system has a range of
approximately 300 ft (91 m).
Remote start is used to defrost windows in cold
weather, and to reach a comfortable climate in
all ambient conditions before the driver enters
the vehicle.
NOTE:
Obstructions between the vehicle and the
key fob may reduce this range.
The Remote Start system will wait for the
Wait To Start Light Úpage 114 to extinguish
before cranking the engine. This allows time
for the intake heater to preheat the incoming
air, and is normal operation in cold weather.

21_DPF_OM_EN_USC_t.book Page 22

58GETTING TO KNOW YOUR VEHICLE
RAIN SENSING WIPERS — IF EQUIPPED
This feature senses rain or snowfall on the
windshield and automatically activates the
wipers. Rotate the end of the multifunction
lever to one of five detent positions to activate
this feature.

The sensitivity of the system can be adjusted with
the multifunction lever. Wiper delay position 1 is
the least sensitive, and wiper delay position 5 is
the most sensitive. Position 3 should be used for
normal rain conditions. Positions 1 and 2 can be
used if the driver desires less wiper sensitivity.
Positions 4 and 5 can be used if the driver
desires more sensitivity. Place the wiper switch in
the O (off) position when not using the system.

NOTE:
The Rain Sensing feature will not operate
when the wiper switch is in the low or
high-speed position.
The Rain Sensing feature may not function
properly when ice, or dried salt water is
present on the windshield.

Use of Rain-X or products containing wax or sili -
cone may reduce Rain Sensing performance.
The Rain Sensing feature can be turned on and
off using the Uconnect system
Ú
page 228.

The Rain Sensing system has protection
features for the wiper blades and arms, and will
not operate under the following conditions:
Low Ambient Temperature — When the igni-
tion is first placed in the ON position, the Rain
Sensing system will not operate until the
wiper switch is moved, vehicle speed is
greater than 0 mph (0 km/h), or the outside
temperature is greater than 32°F (0°C).
Transmission In NEUTRAL Position — When
the ignition is ON, and the transmission is in
the NEUTRAL position, the Rain Sensing
system will not operate until the wiper switch
is moved, vehicle speed is greater than
5 mph (8 km/h), or the gear selector is
moved out of the NEUTRAL position.
Remote Start Mode Inhibit — On vehicles
equipped with Remote Starting system, Rain
Sensing wipers are not operational when the
vehicle is in the remote start mode. Once the
operator is in the vehicle and has placed the
ignition switch in the RUN position, Rain
Sensing wiper operation can resume, if it has
been selected, and no other inhibit condi -
tions (mentioned previously) exist.
CLIMATE CONTROLS
The Climate Control system allows you to
regulate the temperature, air flow, and direction
of air circulating throughout the vehicle.
The controls are located on the touchscreen
(if equipped), on the sides of the touchscreen,
or on the instrument panel below the radio.

21_DPF_OM_EN_USC_t.book Page 58

GETTING TO KNOW YOUR VEHICLE59
AUTOMATIC CLIMATE CONTROL
D
ESCRIPTIONS AND FUNCTIONS

Uconnect 4/4C/4C NAV With 8.4–inch Display
Automatic Temperature Controls
Uconnect 4C NAV With 12–inch Display Automatic Temperature Controls
NOTE:
Icons and descriptions can vary based upon
vehicle equipment.
MAX A/C Button
Press and release the MAX A/C button
on the touchscreen to change the
current setting to the coldest output
of air. The MAX A/C indicator
illuminates when MAX A/C is on. Pressing the
button again will cause the MAX A/C operation
to exit. Pressing other settings will also cause
the MAX A/C to exit.
NOTE:
MAX A/C sets the control for maximum
cooling performance.
The MAX A/C button is only available on the
touchscreen.
A/C Button
Press and release this button on the
touchscreen, or push the button on
the faceplate to change the current
setting. The A/C indicator illuminates
when A/C is on.
Recirculation Button

Press and release this button on the
touchscreen, or push the button on the
faceplate, to change the system between
Recirculation mode and outside air
mode. The Recirculation indicator and the A/C
indicator illuminate when the Recirculation button is
pressed. Recirculation can be used when outside
conditions, such as smoke, odors, dust, or high
humidity are present. Recirculation can be used in
all modes. Recirculation may be unavailable (button
on the touchscreen greyed out) if conditions exist
that could create fogging on the inside of the
windshield. The A/C can be deselected manually
without disturbing the mode control selection.
Continuous use of the Recirculation mode may
make the inside air stuffy and window fogging
may occur. Extended use of this mode is not
recommended.
In cold weather, use of Recirculation mode may lead
to excessive window fogging. The Recirculation
feature may be unavailable if conditions exist that
could create fogging on the inside of the windshield.

2

21_DPF_OM_EN_USC_t.book Page 59

62GETTING TO KNOW YOUR VEHICLE
Bi-Level Mode

Air comes from the instrument panel
outlets and floor outlets. A slight amount
of air is directed through the defrost and
side window demister outlets.

NOTE:
Bi-Level mode is designed under comfort condi -
tions to provide cooler air out of the panel
outlets and warmer air from the floor outlets.
Floor Mode
Air comes from the floor outlets.
A slight amount of air is directed
through the defrost and side window
demister outlets.
Mix Mode
Air is directed through the floor,
defrost, and side window demister
outlets. This setting works best in cold
or snowy conditions that require extra
heat to the windshield. This setting is good for
maintaining comfort while reducing moisture on
the windshield.
Climate Control OFF Button
Press and release the OFF button on
the touchscreen, or push the OFF
button on the faceplate (if equipped)
to turn the Climate Control on/off.
MANUAL CLIMATE CONTROL
D
ESCRIPTIONS AND FUNCTIONS

Uconnect 3 With 5-inch Display Manual Temperature
Controls

MAX A/C Setting
Set the temperature control knob to
the MAX A/C setting to change the
current setting to the coldest output
of air. Moving the temperature control
knob away from the MAX A/C setting causes the
MAX A/C operation to exit.
A/C Button
Push the A/C button to engage the Air
Conditioning (A/C). The A/C indicator
illuminates when A/C is on.
Recirculation Button

Push the Recirculation button to change
the system between recirculation mode
and outside air mode. The Recirculation
indicator and the A/C indicator illuminate
when the Recirculation button is pressed.
Recirculation can be used when outside conditions,
such as smoke, odors, dust, or humidity are present.
Recirculation can be used in all modes except for
Defrost. Recirculation may be unavailable if
conditions exist that could create fogging on the
inside of the windshield. The A/C can be deselected
manually without disturbing the mode control
selection. Continuous use of the Recirculation mode
may make the inside air stuffy and window fogging
may occur. Extended use of this mode is not
recommended.

On vehicles equipped with the Manual Climate
Controls system, the Recirculation mode is not
allowed in Defrost mode to improve window
clearing operation. Recirculation is disabled
automatically if this mode is selected.

21_DPF_OM_EN_USC_t.book Page 62

64GETTING TO KNOW YOUR VEHICLE
Panel Mode
Air comes from the outlets in the
instrument panel. Each of these
outlets can be individually adjusted to
direct the flow of air. The air vanes of
the center outlets and outboard outlets can be
moved up and down or side to side to regulate
airflow direction. There is a shut off wheel
located below the air vanes to shut off or adjust
the amount of airflow from these outlets.
Bi-Level Mode

Air comes from the instrument panel
outlets and floor outlets. A slight amount
of air is directed through the defrost and
side window demister outlets.

NOTE:
Bi-Level mode is designed under comfort condi -
tions to provide cooler air out of the panel
outlets and warmer air from the floor outlets.
Floor Mode
Air comes from the floor outlets.
A slight amount of air is directed
through the defrost and side window
demister outlets.
Mix Mode
Air is directed through the floor,
defrost, and side window demister
outlets. This setting works best in cold
or snowy conditions that require extra
heat to the windshield. This setting is good for
maintaining comfort while reducing moisture on
the windshield.
AUTOMATIC TEMPERATURE
C
ONTROL (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.
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
within Uconnect Settings Ú page 228.
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.

21_DPF_OM_EN_USC_t.book Page 64

GETTING TO KNOW YOUR VEHICLE65
CLIMATE VOICE RECOGNITION
Adjust vehicle temperatures hands-free and
keep everyone comfortable while you keep
moving ahead.
Push the VR button on the steering wheel. After
the beep, say one of the following commands:
“Set driver temperature to 70 degrees ”
“Set passenger temperature to 70 degrees ”

Did you know: Voice Command for Climate may only
be used to adjust the interior temperature of your
vehicle. Voice Command will not work to adjust the
heated seats or steering wheel if equipped.

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

For information on maintaining the Climate
Control system when the vehicle is being stored
for an extended period of time, see
Ú
page 427.

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.

Outside Air Intake
Make sure the air intake, located directly in
front of the windshield, is free of obstructions,
such as leaves. Leaves collected in the air
intake may reduce airflow, and if they enter
the plenum, they could plug the water drains. In Winter months, make sure the air intake is
clear of ice, slush, and snow.
Cabin Air Filter
The climate control system filters out dust and
pollen from the air. Contact an authorized
dealer to service your cabin air filter, and to
have it replaced when needed.
Operating Tips Chart
WEATHER CONTROL SETTINGS
Hot Weather And
Vehicle Interior Is Very Hot Set the mode control
to , on, and blower on high. Roll down the
windows for a minute to flush out the hot air.
Adjust the controls as needed to achieve comfort.
Warm Weather Turn on and set the
mode control to the position.
Cool Sunny Operate in position.
2

21_DPF_OM_EN_USC_t.book Page 65

82GETTING TO KNOW YOUR INSTRUMENT PANEL
6. 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. 7. 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.
WARNING!

A hot engine cooling system is dangerous.
You or others could be badly burned by steam
or boiling coolant. It is recommended to call an
authorized dealer for service if your vehicle
overheats. If you decide to look under the hood
yourself, Follow the warnings under the Cooling
System Pressure Cap paragraph
Ú
page 383.

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.

21_DPF_OM_EN_USC_t.book Page 82