check engine RAM CHASSIS CAB 2019 Owner's Manual

284 STARTING AND OPERATING
NOTE:
• Increased noise levels at the end of the steering wheel
travel are considered normal and do not indicate that there
is a problem with the power steering system.
• Upon initial start-up in cold weather, the power steering
pump may make noise for a short amount of time. This is
due to the cold, thick fluid in the steering system. This
noise should be considered normal, and it does not in any
way damage the steering system.
Power Steering Fluid Check
Checking the power steering fluid level at a defined service
interval is not required. The fluid should only be checked if
a leak is suspected, abnormal noises are apparent, and/or
the system is not functioning as anticipated. Check fluid level when the engine is cold and off. Coordinate inspection
efforts through an authorized dealer.
If necessary, add fluid to restore to the proper indicated
level. With a clean cloth, wipe any spilled fluid from all
surfaces. Refer to “Fluids And Lubricants” in “Technical
Specifications” for further information.CAUTION!
Prolonged operation of the steering system at the end of
the steering wheel travel will increase the steering fluid
temperature and it should be avoided when possible.
Damage to the power steering pump may occur. WARNING!
Fluid level should be checked on a level surface and with
the engine off to prevent injury from moving parts and
to ensure accurate fluid level reading. Do not overfill.
Use only manufacturer's recommended power steering
fluid.
CAUTION!
Do not use chemical flushes in your power steering
system as the chemicals can damage your power steering
components. Such damage is not covered by the New
Vehicle Limited Warranty.

354 STARTING AND OPERATING
If you regularly tow a trailer for more than 45 minutes of
continuous operation, then change the automatic transmis -
sion fluid and filter(s) as specified for "police, taxi, fleet, or
frequent trailer towing." Refer to the “Maintenance Plan” for
the proper maintenance intervals.
NOTE:
Check the automatic transmission fluid level before towing
(Six-speed automatic only).
Tow/Haul Mode
To reduce potential for automatic transmission overheating,
activate TOW/HAUL mode when driving in hilly areas, or
select a lower gear range (using the Electronic Range Select
(ERS) shift control) on more severe grades.
Speed Control — If Equipped
• Do not use on hilly terrain or with heavy loads.
• When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until you
can get back to cruising speed.
• Use speed control in flat terrain and with light loads to
maximize fuel efficiency. Cooling System
To reduce potential for engine and transmission over -
heating, take the following actions:
City Driving
• In city traffic — while stopped, place the transmission in
NEUTRAL, but do not increase engine idle speed.
Highway Driving
• Reduce speed.
• Temporarily turn off air conditioning.
Air Suspension System
To aid in attaching/detaching the trailer from the vehicle,
the air suspension system can be used. Refer to “Air Suspen -
sion System” in “Starting And Operating” for further infor -
mation.
NOTE:
The vehicle must remain in the engine running position
while attaching a trailer for proper leveling of the air suspen -
sion system.

STARTING AND OPERATING 365
CAUTION!
• Always check the depth of the standing water before
driving through it. Never drive through standing water
that is deeper than the bottom of the tire rims mounted
on the vehicle.
• Determine the condition of the road or the path that is
under water and if there are any obstacles in the way
before driving through the standing water.
• Do not exceed 5 mph (8 km/h) when driving through
standing water. This will minimize wave effects.
• Driving through standing water may cause damage to
your vehicle’s drivetrain components. Always inspect
your vehicle’s fluids (i.e., engine oil, transmission, axle,
etc.) for signs of contamination (i.e., fluid that is milky
or foamy in appearance) after driving through standing
water. Do not continue to operate the vehicle if any
fluid appears contaminated, as this may result in
further damage. Such damage is not covered by the
New Vehicle Limited Warranty.
• Getting water inside your vehicle’s engine can cause it
to lock up and stall out, and cause serious internal
damage to the engine. Such damage is not covered by
the New Vehicle Limited Warranty. 5

SERVICING AND MAINTENANCE 411
Once A Month Or Before A Long Trip:
• Check engine oil level.
• Check windshield washer fluid level.
• Check the tire inflation pressures and look for unusual
wear or damage. Rotate at the first sign of irregular wear.
• Check the fluid levels of the coolant reservoir, brake
master cylinder, power steering and automatic transmis -
sion (six-speed only), and fill as needed.
• Check function of all interior and exterior lights. Maintenance Plan
Required Maintenance
Refer to the maintenance plan on the following pages for
required maintenance.
At Every Oil Change Interval As Indicated By Oil Change Indicator System:
• Change oil and filter.
• Rotate the tires. Rotate at the first sign of irregular wear, even if it occurs before the oil indicator system turns on.
• Inspect engine cooling system protection and hoses.
• Inspect exhaust system.
• Inspect engine air cleaner if using in dusty or off-road conditions.
• Inspect battery and clean and tighten terminals as required.
• Inspect automatic transmission fluid if equipped with dipstick.
• Inspect brake pads, shoes, rotors, drums, hoses and park brake.
• Inspect front end, and lubricate — If equipped with serviceable fittings. 7

412 SERVICING AND MAINTENANCE
Mileage or time passed
(whichever comes first)
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
110,000
120,000
130,000
140,000
150,000Or Years: 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
32,000
48,000
64,000
80,000
96,000
112,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000Additional Inspections
Inspect the CV/Universal joints. X X X X X
Inspect front suspension, tie rod
ends, and replace if necessary. X
X X X X X X
Inspect the front and rear axle
surfaces. If gear oil leakage is
suspected, check the fluid level.
If using your vehicle for police,
taxi, fleet, off-road or frequent
trailer towing, change axle fluid. X X X X X X X
Inspect the brake linings,
parking brake function. X X X X X X X
Additional Maintenance
Replace engine air filter. X X X X X
Replace spark plugs. 1
X

416 SERVICING AND MAINTENANCE
Checking Oil Level — Gas Engine
To assure proper lubrication of your vehicle's engine, the
engine oil must be maintained at the correct level. Check the
oil level at regular intervals, such as every fuel stop. The best
time to check the engine oil level is about five minutes after
a fully warmed up engine is shut off.
Checking the oil while the vehicle is on level ground will
improve the accuracy of the oil level readings. Always main -
tain the oil level within the SAFE zone on the dipstick.
Adding one quart of oil when the reading is at the bottom of
the SAFE zone will result in a reading at the top of the safe
zone on these engines.
Adding Washer Fluid
The fluid reservoir is located under the hood and should be
checked for fluid level at regular intervals. Fill the reservoir
with windshield washer solvent only (not radiator anti -
freeze). When refilling the washer fluid reservoir, take some washer fluid and apply it to a cloth or towel and wipe the
wiper blades clean. This will help blade performance.
To prevent freeze-up of your windshield washer system in
cold weather, select a solution or mixture that meets or
exceeds the temperature range of your climate. This rating
information can be found on most washer fluid containers.
After the engine has warmed up, operate the defroster for a
few minutes to reduce the possibility of smearing or freezing
the fluid on the cold windshield. Windshield washer solu -
tion used with water as directed on the container, aids
cleaning action, reduces the freezing point to avoid line clog -
ging, and is not harmful to paint or trim.CAUTION!
Overfilling or underfilling will cause oil aeration or loss
of oil pressure. This could damage your engine. WARNING!
Commercially available windshield washer solvents are
flammable. They could ignite and burn you. Care must
be exercised when filling or working around the washer
solution.

SERVICING AND MAINTENANCE 421
2. Lift the air cleaner cover to access the air cleaner filter.
3. Remove the air cleaner filter element from the housing
assembly.
Open Air Cleaner Filter Assembly Engine Air Cleaner Filter Installation
NOTE:
Inspect and clean the housing if dirt or debris is present
before replacing the air filter element.
1. Install the air cleaner filter element into the housing
assembly with the air cleaner filter inspection surface
facing downward.
2. Install the air cleaner cover onto the housing assembly.
3. Tighten the fasteners (six) on the air cleaner filter
assembly
Air Conditioner Maintenance
For best possible performance, your air conditioner should
be checked and serviced by an authorized dealer at the start
of each warm season. This service should include cleaning of
the condenser fins and a performance test. Drive belt tension
should also be checked at this time.1 — Air Cleaner Cover
2 — Air Cleaner Filter
7

434 SERVICING AND MAINTENANCE
Engine Coolant Checks
Check the engine coolant (antifreeze) protection every
12 months (before the onset of freezing weather, where
applicable). If the engine coolant (antifreeze) is dirty or rusty
in appearance, the system should be drained, flushed and
refilled with fresh coolant. Check the front of the A/C
condenser (if equipped) or radiator for any accumulation of
bugs, leaves, etc. If dirty, clean by gently spraying water
from a garden hose vertically down the face of the A/C
condenser (if equipped) or the back of the radiator core.
Check the engine cooling system hoses for brittle rubber,
cracking, tears, cuts and tightness of the connection at the
coolant recovery bottle and radiator. Inspect the entire
system for leaks.
DO NOT REMOVE THE COOLANT PRESSURE CAP
WHEN THE COOLING SYSTEM IS HOT.
Cooling System — Drain, Flush And Refill
NOTE:
Some vehicles require special tools to add coolant properly.
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 an authorized dealer. If the engine coolant (antifreeze) is dirty or contains visible
sediment, have an authorized dealer clean and flush with
OAT coolant (antifreeze) (conforming to MS.90032).
Refer to the “Maintenance Plan” in this section for the proper
maintenance intervals.
Selection Of Coolant
Refer to “Fluids And Lubricants” in “Technical Specifica -
tions” for further information.
NOTE:
• Mixing of engine coolant (antifreeze) other than specified
Organic Additive Technology (OAT) engine coolant (anti -
freeze), may result in engine damage and may decrease
corrosion protection. Organic Additive Technology (OAT)
engine coolant is different and should not be mixed with
Hybrid Organic Additive Technology (HOAT) engine
coolant (antifreeze) or any “globally compatible” coolant
(antifreeze). If a non-OAT engine coolant (antifreeze) is
introduced into the cooling system in an emergency, the
cooling system will need to be drained, flushed, and
refilled with fresh OAT coolant (conforming to MS.90032),
by an authorized dealer as soon as possible.

436 SERVICING AND MAINTENANCE
NOTE:
• It is the owner's responsibility to maintain the proper level
of protection against freezing according to the tempera -
tures 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 authorized
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 possible.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of engine
coolant (antifreeze), and to ensure that engine coolant (anti -
freeze) 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 accu -
mulation of foreign material on the sealing surfaces. Disposal Of Used Coolant
Used ethylene glycol-based coolant (antifreeze) is a regu -
lated substance requiring proper disposal. Check with your
local authorities to determine the disposal rules for your
community. To prevent ingestion by animals or children, do
not store ethylene glycol-based coolant in open containers or
allow it to remain in puddles on the ground. If ingested by a
child or pet, seek emergency assistance immediately. Clean
up any ground spills immediately. 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 over -
heated 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 specified
for your vehicle. Personal injury or engine damage may
result.

SERVICING AND MAINTENANCE 437
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 operating
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 compartment. This is normally a result of mois -
ture from rain, snow, or high humidity accumulating on the
radiator and being vaporized when the thermostat opens,
allowing hot engine coolant (antifreeze) 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) additions are required,
the cooling system should be pressure tested for leaks.
• Maintain engine coolant (antifreeze) concentration at a
minimum of 50% OAT coolant (conforming to MS.90032)
and distilled water for proper corrosion protection of your
engine which contains aluminum components.
• 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 oper -
ation. If replacement is ever necessary, install ONLY the
correct type thermostat. Other designs may result in unsat -
isfactory engine coolant (antifreeze) performance, poor
gas mileage, and increased emissions. 7