2004 CHEVROLET EXPRESS oil pressure

Tire Terminology and Denitions
Air Pressure:The amount of air inside the tire pressing
outward on each square inch of the tire. Air pressure
is expressed in pounds per square inch (psi) or
kiloPascal (kPa).
Accessory Weight:This means the combined weight
of optional accessories. Some examples of optional
accessories are, automatic transmission, power steering,
power brakes, power windows, power seats, and
air conditioning.
Aspect Ratio:The relationship of a tire’s height to
its width.
Belt:A rubber coated layer of cords that is located
between the plies and the tread. Cords may be made
from steel or other reinforcing materials.
Bead:The tire bead contains steel wires wrapped by
steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies are
laid at alternate angles less than 90 degrees to the
centerline of the tread.Cold Ination Pressure:The amount of air pressure in
a tire, measured in pounds per square inch (psi) or
kilopascals (kPa) before a tire has built up heat
from driving. SeeInation - Tire Pressure on page 5-58.
Curb Weight:This means the weight of a motor
vehicle with standard and optional equipment including
the maximum capacity of fuel, oil and coolant, but
without passengers and cargo.
DOT Markings:A code molded into the sidewall of a
tire signifying that the tire is in compliance with the U.S.
Department of Transportation (DOT) motor vehicle
safety standards. The DOT code includes the Tire
Identication Number (TIN), an alphanumeric designator
which can also identify the tire manufacturer, production
plant, brand and date of production.
GVWR:Gross Vehicle Weight Rating, seeLoading
Your Vehicle on page 4-29.
GAWR FRT:Gross Axle Weight Rating for the front
axle, seeLoading Your Vehicle on page 4-29.
GAWR RR:Gross Axle Weight Rating for the rear axle,
seeLoading Your Vehicle on page 4-29.
5-56

Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. SeeEngine Oil on page 5-13. Reset oil
life system. SeeEngine Oil Life System on page 5-16.An Emission
Control Service.••
Lubricate chassis components.See footnote #.••
Visually check for any leaks or damage.See footnote (j).••
Inspect engine air cleaner lter or change indicator (if equipped). If necessary,
replace lter. SeeEngine Air Cleaner/Filter on page 5-17.An Emission Control
Service. See footnotes † and (l).•
Rotate tires and check ination pressures and wear. SeeTires on page 5-52.••
Inspect brake system.See footnote (a).••
Check engine coolant and windshield washer uid levels and add uid
as needed.••
Perform any needed additional services. See “Additional Required Services” in
this section.••
Inspect suspension and steering components.See footnote (b).•
Inspect engine cooling system.See footnote (c).•
Inspect wiper blades.See footnote (d).•
Inspect restraint system components.See footnote (e).•
Lubricate body components.See footnote (f).•
Check transmission uid level and add uid as needed.•
Inspect shields, vehicles with GVWR above 10,000 lbs (4 536 kg) only.See
footnote (g).•
Inspect throttle system.See footnote (m).•
6-5

(g)Vehicles with GVWR above 10,000 lbs (4 536 kg)
only: Inspect shields for damage or looseness. Adjust or
replace as required. This is a Noise Emission Control
Service. Applicable only to vehicles sold in the
United States.
(h)Change automatic transmission uid and lter if the
vehicle is mainly driven under one or more of these
conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police or delivery
service.
(i)Drain, ush and rell cooling system. See Engine
Coolant on page 5-22for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ller neck.
Pressure test the cooling system and pressure cap.(j)A uid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the uid level checked. Add uid if needed.
(k)Inspect system. Check all fuel and vapor lines and
hoses for proper hook-up, routing and condition.
Check that the purge valve works properly (if equipped).
Replace as needed.
(l)If you drive regularly under dusty conditions, inspect
the lter at each engine oil change.
(m)Check system for interference or binding and for
damaged or missing parts. Replace parts as needed.
Replace any components that have high effort or
excessive wear. Do not lubricate accelerator or cruise
control cables.
6-9

Owner Checks and Services
These owner checks and services should be performed
at the intervals specied to help ensure the safety,
dependability and emission control performance of your
vehicle. Your GM Goodwrench dealer can assist you
with these checks and services.
Be sure any necessary repairs are completed at once.
Whenever any uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
inRecommended Fluids and Lubricants on page 6-13.
At the First 100, 1,000 and
6,000 Miles (160, 1 600
and 10 000km)
For vehicles with dual wheels, check dual wheel nut
torque. For proper torque, seeCapacities and
Specications on page 5-97.
At Each Fuel Fill
It is important to perform these underhood checks at
each fuel ll.
Engine Oil Level Check
Check the engine oil level and add the proper oil if
necessary. SeeEngine Oil on page 5-13for further
details.
Notice:It is important to check your oil regularly
and keep it at the proper level. Failure to keep your
engine oil at the proper level can cause damage
to your engine not covered by your warranty.
Engine Coolant Level Check
Check the engine coolant level and add
DEX-COOL®coolant mixture if necessary. SeeEngine
Coolant on page 5-22for further details.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in the windshield
washer tank and add the proper uid if necessary.
At Least Once a Month
Tire Ination Check
Visually inspect your tires and make sure tires are
inated to the correct pressures. Do not forget to check
your spare tire. SeeTires on page 5-52for further
details. Check to make sure the spare tire is stored
securely. Push, pull and then try to turn the spare tire. If
it moves, tighten it. SeeChanging a Flat Tire on
page 5-68.
6-10

Extender, Safety Belt.......................................1-30
Exterior Lamps...............................................3-13
F
Filter
Engine Air Cleaner......................................5-17
Finish Damage...............................................5-89
Fixed Mast Antenna........................................3-74
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-67
Flat Tire, Changing.........................................5-68
Flat Tire, Storing.............................................5-80
Fluid
Automatic Transmission................................5-19
Power Steering...........................................5-32
Windshield Washer......................................5-33
Front Axle......................................................5-44
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Filling a Portable Fuel Container....................5-10
Filling Your Tank........................................... 5-8
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-38
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Regulator...................................................2-20Fuses
Engine Compartment Fuse Block...................5-94
Floor Console Fuse Block.............................5-93
Fuses and Circuit Breakers...........................5-92
Windshield Wiper.........................................5-92
G
Gage
Check Gages Warning Light..........................3-38
Engine Coolant Temperature.........................3-31
Fuel..........................................................3-38
Oil Pressure...............................................3-34
Speedometer..............................................3-24
Voltmeter Gage...........................................3-28
Gasoline
Octane........................................................ 5-5
Specications............................................... 5-5
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Headlamp Wiring............................................5-92
Headlamps....................................................5-47
Bulb Replacement.......................................5-46
Daytime Running Lamps...............................3-14
Flash-to-Pass............................................... 3-9
5

Mirrors (cont.)
Outside Manual Mirror..................................2-29
Outside Power Mirrors..................................2-30
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-18
Noise Control System, Tampering......................5-45
Normal Maintenance Replacement Parts............6-15
O
Odometer......................................................3-24
Odometer, Trip...............................................3-24
Off-Road Recovery..........................................4-12
Oil
Change Engine Oil Light...............................3-35
Engine.......................................................5-13
Pressure Gage............................................3-34
Older Children, Restraints................................1-31
Online Owner Center........................................ 7-3
OnStar
®System.............................................2-31
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-20Outside
Camper-Type Mirrors....................................2-29
Convex Mirror.............................................2-30
Heated Mirrors............................................2-31
Manual Mirror.............................................2-29
Power Mirrors.............................................2-30
Owner Checks and Services.............................6-10
Owners, Canadian............................................... ii
P
Park (P)
Shifting Into................................................2-25
Shifting Out of............................................2-26
Parking
Brake........................................................2-24
Over Things That Burn.................................2-27
Passing.........................................................4-12
Passlock
®......................................................2-18
Power
Accessory Outlets........................................3-16
Door Locks.................................................. 2-8
Reduced Engine Light..................................3-37
Retained Accessory (RAP)............................2-19
Seat............................................................ 1-4
Steering Fluid.............................................5-32
Windows....................................................2-16
Pretensioners, Safety Belt................................1-30
8