2020 Ram 3500 Chassis Cab air conditioning

366SERVICING AND MAINTENANCE
Checking Coolant Level — 6.4L Engine
The level of the coolant in the pressurized
coolant bottle should be between the “MIN” and
“MAX” range on the bottle when the engine is
cold.
The radiator normally remains completely full,
so there is no need to remove the cap unless
checking for coolant freeze point or replacing
engine coolant (antifreeze). Advise your service
attendant of this. As long as the engine oper -
ating temperature is satisfactory, the coolant
bottle need only be checked once a month.
When additional engine coolant (antifreeze) 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/
kilometers of operation, you may observe vapor
coming from the front of the engine compart -
ment. This is normally a result of moisture from
rain, snow, or high humidity accumulating on
the radiator and being vaporized when the ther -
mostat opens, allowing hot engine coolant (anti -
freeze) 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 expansion bottle.
Check the coolant freeze point in the radiator
and in the coolant expansion bottle. If engine
coolant (antifreeze) needs to be added, the
contents of the coolant expansion bottle
must also be protected against freezing.
If frequent engine coolant (antifreeze) addi-
tions are required, the cooling system should
be pressure tested for leaks.
Maintain engine coolant (antifreeze) concen
-
tration at a minimum of 50% OAT coolant
(conforming to MS.90032) and distilled
water for proper corrosion protection of your
engine which contains aluminum compo -
nents.
Make sure that the coolant expansion 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.
Do not change the thermostat for Summer or
Winter operation. If replacement is ever
necessary, install ONLY the correct type ther -
mostat. Other designs may result in unsatis -
factory engine coolant (antifreeze)
performance, poor gas mileage, and
increased emissions.
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 mani -
fold 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.

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SERVICING AND MAINTENANCE393
Temperature Grades
The Temperature grades are A (the
highest), B, and C, representing the tire's
resistance to the generation of heat and
its ability to dissipate heat, when tested
under controlled conditions on a speci -
fied indoor laboratory test wheel.
Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive
temperature can lead to sudden tire
failure. The grade C corresponds to a
level of performance, which all
passenger vehicle tires must meet
under the Federal Motor Vehicle Safety
Standard No. 109. Grades B and A repre -sent higher levels of performance on the
laboratory test wheel, than the minimum
required by law.
STORING THE VEHICLE
If you are storing your vehicle for more than 21
days, we recommend that you take the following
steps to minimize the drain on your vehicle's
battery:
Disconnect the negative cable from battery.
Any time 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 the fresh air and
high blower setting. This will ensure
adequate system lubrication to minimize the
possibility of compressor damage when the
system is started again.
BODYWORK
Protection From Atmospheric Agents
Vehicle body care requirements vary according
to geographic locations and usage. Chemicals
that make roads passable in snow and ice and
those that are sprayed on trees and road
surfaces during other seasons are highly corro
-
sive to the metal in your vehicle. Outside
parking, which exposes your vehicle to airborne
contaminants, road surfaces on which the
vehicle is operated, extreme hot or cold weather
and other extreme conditions will have an
adverse effect on paint, metal trim, and under -
body protection.
The following maintenance recommendations
will enable you to obtain maximum benefit from
the corrosion resistance built into your vehicle.
WARNING!
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
WARNING!
The temperature grade for this tire is
established for a tire that is properly inflated
and not overloaded. Excessive speed,
under-inflation, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.
7

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INDEX
A
Accessories..........................................413Mopar.............................................413Adaptive Cruise Control (ACC) (Cruise
Control)...............................................232Adding Engine Coolant (Antifreeze)............364Adding Fuel..........................................269Additives, Fuel......................................400AdjustDown................................................31Forward.............................................31Rearward...........................................31Up....................................................31Adjustable Pedals....................................39Air BagAir Bag Operation...............................153Air Bag Warning Light..........................151Enhanced Accident Response.......158, 328Event Data Recorder (EDR)...................328If Deployment Occurs..........................157Knee Impact Bolsters..........................154Maintaining Your Air Bag System............158Maintenance.....................................158Transporting Pets...............................179Air Bag Light......................... 108, 151, 181Air Cleaner, Engine (Engine Air
Cleaner Filter)............................... 349, 371
Air Conditioner Maintenance.................... 351Air Conditioner Refrigerant............... 351, 352Air Conditioner System............................ 351Air Conditioning................................. 52, 62Air Conditioning Filter....................... 64, 352Air Conditioning System............................ 62Air Conditioning, Operating Tips.................. 63Air Filter.............................................. 349Air PressureTires............................................... 383AlarmPanic................................................ 14Security Alarm............................. 24, 110Alterations/ModificationsVehicle.............................................. 11Android Auto........................................ 496Antifreeze (Engine Coolant)...................... 364Capacites......................................... 405Disposal.......................................... 365Anti-Lock Brake System (ABS)................... 120Anti-Lock Warning Light........................... 114Apple CarPlay....................................... 497Assist, Hill Start..................................... 122Audio Systems (Radio)............................ 414Auto Down Power Windows........................ 65Auto Unlock, Doors................................ 216Automatic Door Locks............................... 29
Automatic Headlights............................... 46Automatic Temperature Control (ATC).......... 62Automatic Transmission................. 213, 370Adding Fluid..................................... 370Fluid And Filter Change....................... 370Fluid Change.................................... 370Fluid Level Check.............................. 368Fluid Type........................ 368, 409, 412Shifting........................................... 207Special Additives............................... 368Automatic Transmission Limp Home Mode.. 216AUX Camera................................. 261, 267Auxiliary Driving Systems........................ 129Axle Fluid.....................370, 371, 409, 412Axle Lubrication............................ 370, 371
B
Back-Up.............................................. 258Back-Up Camera................................... 258Battery....................................... 110, 346Blanket........................................... 196Charging System Light........................ 110Keyless Key Fob Replacement................ 14Battery Saver Feature.............................. 48Belts, Seat........................................... 180Body Builders Guide................................ 11Body Mechanism Lubrication................... 360

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506
Dipsticks Power Steering
..................................229Disabled Vehicle Towing..........................326DisposalAntifreeze (Engine Coolant)...................365Do Not Disturb......................................496Door Ajar.............................................111Door Ajar Light......................................111Door LocksAutomatic...........................................29Doors....................................................25Draining Fuel/Water Separator Filter..........354Driver’s Seat Back Tilt...............................30DrivingThrough Flowing, Rising, Or Shallow Standing Water
..........................................292Dual Rear Wheels.................. 317, 391, 398
E
Electric Brake Control System...................121Anti-Lock Brake System.......................120Electronic Roll Mitigation..............124, 127Electrical Power Outlets.............................78Electronic Range Select (ERS)........... 211, 217Electronic Stability Control (ESC)...............124Electronic Throttle Control Warning Light.....110Electronically Shifted Transfer Case...219, 222Emergency Braking................................204Emergency, In Case OfFreeing Vehicle When Stuck..................324
Hazard Warning Flasher...................... 294Jacking............................................ 314Jump Starting................................... 319Emission Control System Maintenance....... 119Engine........................................ 343, 344Air Cleaner....................................... 349Block Heater..................................... 190Break-In Recommendations................. 202Compartment.................................... 344Compartment Identification.................. 343Coolant (Antifreeze).................... 407, 410Exhaust Gas Caution.................. 180, 401Fails To Start.................................... 186Flooded, Starting............................... 186Fuel Requirements............................. 399Identifcation..................................... 344Idling.............................................. 197Jump Starting................................... 319Oil.................................. 347, 407, 410Oil Filler Cap............................. 343, 348Oil Filter........................................... 349Oil Reset............................................ 93Oil Selection..................................... 347Oil Synthetic..................................... 349Overheating...................................... 321Runaway.......................................... 267Starting........................................... 184Engine Oil Viscosity................................ 348Enhanced Accident Response
Feature....................................... 158, 328
Entry System, Illuminated.......................... 49Ethanol............................................... 400Exhaust Brake...................................... 203Exhaust Gas Cautions.................... 180, 401Exhaust System.................... 180, 362, 371Exterior Lighting...................................... 44Exterior Lights................................ 44, 182
F
FiltersAir Cleaner
....................................... 349Air Conditioning........................... 64, 352Engine Fuel.............................. 354, 407Engine Oil........................ 349, 407, 410Engine Oil Disposal............................ 349FlashersTurn Signals....................... 47, 117, 182Flash-To-Pass......................................... 46Flat Tire Stowage.................................. 318Fluid Capacities.................................... 405Fluid Leaks.......................................... 182Fluid Level ChecksBrake............................................. 367Power Steering.................................. 229Fluids And Lubricants..................... 407, 410Fog Lights..................................... 47, 303Fold Flat Load Floor................................. 76Fold-Flat Seats....................................... 30Forward Collision Warning....................... 129Four Wheel Drive.................................. 218

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