Page 208 of 300

HAZARD WARNING FLASHER
The flasher switch is on the top of the steering column,
just behind the steering wheel. Press the flasher switch
and all front and rear directional signals will flash
intermittently.
Press the switch a second time to turn off the emergency
flashers.
This is an emergency warning system and should not be
used when the vehicle is in motion. Use it when your
vehicle is disabled and is creating a safety hazard for
other motorists.If it is necessary to leave the vehicle to go for service, the
flasher system will continue to operate with the ignition
key removed and the vehicle locked.
ADDING FUEL
On some models, the fuel tank filler tube, on vehicles
equipped with a catalytic converter, has a restricting door
about 2 inches (50 mm) inside the opening. If using a
portable fuel container, it should have a flexible nozzle
long enough to force open the restricting door.
WARNING!
A fire may result if gasoline is pumped into a
portable container that is in a vehicle or on a truck
bed. You could be burned. Always place gas contain-
ers on the ground while filling.
208 WHAT TO DO IN EMERGENCIES
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WARNING!
Remove the gas cap slowly to prevent fuel spray
from the filler neck which may cause injury.
The volatility of present gasolines may cause a build
up of pressure in the fuel tank that may increase
while you drive. This pressure can result in a spray
of gasoline and/or vapors when you remove the cap
from a hot vehicle. Removing the cap slowly allows
the pressure to vent and prevents fuel spray.
Never allow any lit smoking materials near the
vehicles while removing the cap or filling the tank.
Never add fuel to the vehicle when the engine is
running.
CHANGING A FLAT TIRE
Jack Location
The jack, jack drive tube, 2 tube extensions, and wheel
wrench are located behind the seat on the passenger's
side of the vehicle.
WARNING!
The jack is designed as a tool for changing tires only.
The jack should not be used to lift the vehicle for
service purposes, unless suitable supports are placed
under the vehicle as a safety measure. The vehicle
should be jacked on a firm level surface only. Avoid
ice or slippery areas.
²In the Regular Cab the jack and tools are stowed under
a formation in the carpet behind the passenger seat.
²In the Quad Cab the jack and tools are stowed under
the rear seat. Lift the passenger side rear seat cushion
to gain access to this area.
WHAT TO DO IN EMERGENCIES 209
6
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MAINTAINING YOUR VEHICLE
CONTENTS
mEngine Compartment 3.7L V6.............221
mEngine Compartment 4.7L V-8............222
mOnboard Diagnostic System Ð OBD II......223
mEmissions Inspection And Maintenance
Programs
............................224
mReplacement Parts.....................225
mDealer Service........................225
mMaintenance Procedures.................226
NEngine Oil..........................226
NEngine Oil Filter......................229
NDrive Belts Ð Check Condition And Tension . . 230
NSpark Plugs.........................230NIgnition Cables.......................230
NEngine Air Cleaner Filter................230
NEngine Fuel Filter.....................231
NCatalytic Converter....................231
NMaintenance-Free Battery................232
NAir Conditioner Maintenance.............233
NPower Steering Ð Fluid Check............234
NFront Suspension Ball Joints..............235
NSteering Linkage......................235
NDrive Shaft Constant Velocity
Joints Ð 4X4 Models...................235
NBody Lubrication.....................235
7
Page 223 of 300

ONBOARD DIAGNOSTIC SYSTEM Ð OBD II
Your vehicle is equipped with a sophisticated onboard
diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and automatic
transmission control systems. When these systems are
operating properly, your vehicle will provide excellent
performance and fuel economy, as well as engine emis-
sions well within current government regulations.
If any of these systems require service, the OBD II system
will turn on the ªMalfunction Indicator Light.º It will
also store diagnostic codes and other information to
assist your service technician in making repairs. Al-
though your vehicle will usually be drivable and not
need towing, see your dealer for service as soon as
possible.CAUTION!
²Prolonged driving with the ªMalfunction Indica-
tor Lightº on could cause further damage to the
emission control system. It could also affect fuel
economy and driveability. The vehicle must be
serviced before any emissions tests can be per-
formed.
²If the ªMalfunction Indicator Lightº is flashing
while the engine is running, severe catalytic con-
verter damage and power loss will soon occur.
Immediate service is required.
MAINTAINING YOUR VEHICLE 223
7
Page 227 of 300

CAUTION!
Overfilling or underfilling the crankcase will cause
oil aeration or loss of oil pressure. This could dam-
age your engine.
Frequency Of Oil Change
Road conditions and your style of driving affect the
interval at which your oil should be changed. Check the
following to determine if any apply to you:
²Day or night temperatures are below 32ÉF (0ÉC).
²Stop and go driving.
²Extensive engine idling.
²Driving in dusty conditions
²Short trips of less than 10 miles (16.2 km)
²More than 50% of your driving is at sustained high
speeds during hot weather, above 32ÉC (90ÉF)
²Trailer towing
²Taxi, Police or delivery service (commercial service)
²Off-road or desert operation
²If equipped for and operating with E-85 (ethanol)
fuel.
NOTE:IfANYof these apply to you then change your
engine oil every 3,000 miles (5 000 km) or 3 months,
whichever comes first and follow schedule ªBº of the
9Maintenance Schedules9section of this manual.
If none of these apply to you, then change your engine oil
at every interval shown on schedule9A9of the9Mainte-
nance Schedules9section of this manual.
4x4 Models, If Used Primarily For Off-Road
Operation
Every 50 hours of use.
MAINTAINING YOUR VEHICLE 227
7
Page 228 of 300

Dusty Conditions
Driving through dust-laden air increases the problems of
keeping abrasive materials out of the engine. Under these
conditions, special attention should be given to the
engine air cleaner and the crankcase inlet air cleaner. The
crankcase ventilation system should also be checked
periodically. Make sure that these units are always clean.
This will tend to reduce to a minimum the amount of
abrasive material that may enter the engine.
Engine Oil Selection
For best performance and maximum protection under all
types of operating conditions, the manufacture only
recommends engine oils that are API certified and meet
the requirements of DaimlerChrysler Material Standard
MS-6395. Use Mopar or an equivalent oil meeting the
specification MS-6395.
American Petroleum Institute (API) Oil
Identification Symbol
There is a symbol to aid you in selecting the proper
engine oil.This symbol means that the oil has
been certified by the American
Petroleum Institute (API). The
manufacture only recommends
API Certified engine oils that
meet the requirements of
DaimlerChrysler Material Stan-
dard MS-6395. Use Mopar or an
equivalent oil meeting the specifi-
cation MS-6395.
Engine Oil Viscosity Chart
The proper SAE viscosity grade of engine oil should be
selected based on the following recommendation and be
within the operating temperature shown in the recom-
mended SAE viscosity chart.
²SAE 5W-30 is the oil recommended in trucks equipped
with a 3.7L/4.7L engine, for optimum fuel economy.
²Synthetic engine oils may be used provided that the oil
quality requirements described above are met and the
recommended maintenance intervals for oil and filter
changes are followed.
228 MAINTAINING YOUR VEHICLE
Page 231 of 300

WARNING!
The air cleaner can provide a measure of protection
in the case of engine backfire. Do not remove the air
cleaner unless such removal is necessary for repair or
maintenance. Make sure that no one is near the
engine compartment before starting the vehicle with
the air cleaner removed. Failure to do so can result in
serious personal injury.
Engine Fuel Filter
A plugged fuel filter can cause stalling, limit the speed at
which a vehicle can be driven or cause hard starting.
Should an excessive amount of dirt accumulate in the
fuel tank, frequent filter replacement may be necessary.
Catalytic Converter
The catalytic converter requires the use of unleaded fuel
only. Leaded gasoline will destroy the effectiveness of the
catalyst as an emission control device.Under normal operating conditions, the catalytic con-
verter will not require maintenance. However, it is im-
portant to keep the engine properly tuned to assure
proper catalyst operation and prevent possible catalyst
damage.
CAUTION!
Damage to the catalytic converter can result if your
vehicle is not kept in proper operating condition. In
the event of engine malfunction, particularly involv-
ing engine misfire or other apparent loss of perfor-
mance, have your vehicle serviced promptly. Contin-
ued operation of your vehicle with a severe
malfunction could cause the converter to overheat,
resulting in possible damage to the converter and the
vehicle.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
MAINTAINING YOUR VEHICLE 231
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Page 241 of 300

The radiator normally remains completely full, so there is
no need to remove the pressure cap except when check-
ing coolant freeze point or when replacing coolant. Your
service attendant should be advised of this. When addi-
tional coolant is needed to maintain the proper level, it
should be added to the overflow bottle. Do not overfill.
Points To Remember
A. Do not overfill the reserve tank (overflow bottle).
B. Check coolant freeze point in the radiator and in the
reserve tank. If antifreeze needs to be added, contents of
reserve tank also must be protected against freezing.
C. If frequent coolant additions are required, or if the
level in the reserve tank does not drop when the engine
cools, the cooling system should be pressure tested for
leaks.D. Maintain a minimum coolant concentration of 50%
ethylene glycol.
E. Make sure that the radiator and reserve tank overflow
hoses are not kinked or obstructed.
F. Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean also.
G. The thermostat should not be changed for summer or
winter operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory cooling performance.
Emission Related Components
Fuel System Hoses And Vapor/Vacuum Harnesses
When the vehicle is serviced for scheduled maintenance,
inspect surface of hoses and nylon tubing for evidence of
heat and mechanical damage. Hard and brittle rubber,
cracking, checking, tears, cuts, abrasions, and excessive
swelling suggest deterioration of the rubber. Particular
attention should be given to examining hose surfaces
nearest to high heat sources, such as the exhaust mani-
fold.
MAINTAINING YOUR VEHICLE 241
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