2018 Ram 4500 Chassis Cab engine overheat

•Mix a minimum solution of 50% OAT engine coolant
that meets the requirements of FCA Material Standard
MS.90032 and distilled water. Use higher concentrations
(not to exceed 70%) if temperatures below 34°F (37°C)
are anticipated. Please contact an authorized dealer for
assistance.
• Use only high purity water such as distilled or deionized
water when mixing the water/engine coolant (anti-
freeze) solution. The use of lower quality water will
reduce the amount of corrosion protection in the engine
cooling system.
NOTE:
• It is the owner’s responsibility to maintain the proper
level of protection against freezing according to the
temperatures occurring in the area where the vehicle is
operated.
• Some vehicles require special tools to add coolant prop-
erly. Failure to fill these systems properly could lead to
severe internal engine damage. If any coolant is needed
to be added to the system, please contact a local autho-
rized dealer.
• Mixing engine coolant (antifreeze) types is not recom-
mended and can result in cooling system damage. If HOAT and OAT coolant are mixed in an emergency,
have a authorized dealer drain, flush, and refill with
OAT coolant (conforming to MS.90032) as soon as pos-
sible.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of engine
coolant (antifreeze), and to ensure that engine coolant
(antifreeze) will return to the radiator from the coolant
expansion bottle/recovery tank if so equipped.
The cap should be inspected and cleaned if there is any
accumulation of foreign material on the sealing surfaces.
WARNING!
•
Do not open hot engine cooling system. Never add
engine coolant (antifreeze) when the engine is over-
heated. Do not loosen or remove the cap to cool an
overheated engine. Heat causes pressure to build up
in the cooling system. To prevent scalding or injury,
do not remove the pressure cap while the system is
hot or under pressure.
• Do not use a pressure cap other than the one speci-
fied for your vehicle. Personal injury or engine
damage may result.
386 SERVICING AND MAINTENANCE

MMT In Gasoline
Methylcyclopentadienyl Manganese Tricarbonyl (MMT) is
a manganese-containing metallic additive that is blended
into some gasoline to increase octane. Gasoline blended
with MMT provides no performance advantage beyond
gasoline of the same octane number without MMT. Gaso-
line blended with MMT reduces spark plug life and
reduces emissions system performance in some vehicles.
The manufacturer recommends that gasoline without
MMT be used in your vehicle. The MMT content of
gasoline may not be indicated on the gasoline pump;
therefore, you should ask your gasoline retailer whether
the gasoline contains MMT. MMT is prohibited in Federal
and California reformulated gasoline.
Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle’s
performance:
•The use of leaded gasoline is prohibited by Federal
law. Using leaded gasoline can impair engine perfor-
mance and damage the emissions control system.
(Continued)
CAUTION! (Continued)
•An out-of-tune engine or certain fuel or ignition
malfunctions can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your authorized dealer for service assistance.
• The use of fuel additives, which are now being sold
as octane enhancers, is not recommended. Most of
these products contain high concentrations of metha-
nol. Fuel system damage or vehicle performance
problems resulting from the use of such fuels or
additives is not the responsibility of the manufac-
turer and may void or not be covered under the New
Vehicle Limited Warranty.
NOTE: Intentional tampering with the emissions control
system can result in civil penalties being assessed against
you.
432 TECHNICAL SPECIFICATIONS

Door Ajar Light........................... .153
Door Locks, Automatic .......................40
Door Opener, Garage ....................... .102
Driver’s Seat Back Tilt ........................43
Driving Through Flowing, Rising, Or Shallow Standing
Water ................................ .317
Dual Rear Wheels ....................343, 417, 427
Electrical Power Outlets ..................... .123
Electronically Shifted Transfer Case ..............260
Electronic Brake Control System ................165
Anti-Lock Brake System ....................164
Electronic Roll Mitigation ...................173
Traction Control System ....................168
Electronic Range Select (ERS)..................254
Electronic Speed Control (Cruise Control) .........270
Electronic Stability Control (ESC) ...............169
Electronic Throttle Control Warning Light .........152
Emergency Brake .......................... .245
Emergency, In Case Of Freeing Vehicle When Stuck .................350
Hazard Warning Flasher ...................320
Jacking ............................... .339
Jump Starting .......................... .345Emission Control System Maintenance
............160
Engine ................................. .364
Air Cleaner ............................ .368
Break-In Recommendations .................244
Compartment Identification .................364
Coolant (Antifreeze) ..................... .435
Exhaust Gas Caution ...................233, 433
Fails To Start ........................... .243
Flooded, Starting ........................ .243
Fuel Requirements ....................... .429
Jump Starting .......................... .345
Oil .............................. .367, 435
Oil Filler Cap ....................... .364, 368
Oil Filter .............................. .368
Oil
Selection ........................... .367
Oil Synthetic ........................... .368
Overheating ........................... .348
Engine Oil Viscosity ........................ .368
Enhanced Accident Response Feature .........206, 355
Entry System, Illuminated .....................78
Ethanol ................................. .431
Exhaust Gas Caution .....................233, 433
Exhaust System ....................... .233, 382
Exterior Lighting ............................69
12
INDEX 515

Occupant Restraints........................ .183
Octane Rating, Gasoline (Fuel) .................429
Oil, Engine ........................... .367, 435
Capacity .............................. .434
Change Interval ........................ .367
Dipstick .............................. .365
Disposal .............................. .368
Filter ............................. .368, 435
Filter Disposal .......................... .368
Identification Logo ...................... .367
Materials Added To ...................... .368
Pressure Warning Light ....................152
Recommendation ........................ .367
Synthetic ............................. .368
Viscosity .............................. .368
Oil Filter, Change ......................... .368
Oil Filter, Selection ......................... .368
Oil Pressure Light ......................... .152
Onboard Diagnostic System ...................159
Operating Precautions ...................... .159
Operator Manual (Owner’s Manual) ...............5
Outside Rearview Mirrors .....................62
Overdrive ............................... .255
Overdrive OFF Switch ...................... .255
Overheating, Engine ....................... .348Owner’s Manual (Operator Manual)
...........5,510
Paint Care ............................... .420
Panic Alarm ...............................22
Parking Brake ............................ .245
ParkSense System, Rear ...................273, 280
Passive Entry ..............................37
Pedals, Adjustable ...........................59
Personalized Menu Bar ..................... .441
Personal Settings .......................... .144
Pets ................................... .233
Placard, Tire And Loading Information ...........400
Power Distribution

Center (Fuses) ..................332
Door Locks ..............................37
Mirrors ................................63
Outlet (Auxiliary Electrical Outlet) .........123, 127
Seats ..................................46
Steering ........................... .268, 269
Take-Off Adapter ........................ .266
Take-Off Operation ...................... .266
Windows ...............................99
Power Seats Down .............................. .46, 48
Forward ............................ .46, 48
520 INDEX