2004 GMC ENVOY XL oil pressure

Cooling System
When you decide it’s safe to lift the hood, here’s what
you’ll see:
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C. Engine Fan
If the coolant inside the coolant recovery tank is boiling,
don’t do anything else until it cools down. The vehicle
should be parked on a level surface. L6 Engine
V8 Engine
5-30

(D) Construction Code:A letter code is used to
indicate the type of ply construction in the tire. The letter
“R” means radial ply construction; the letter “D” means
diagonal or bias ply construction; and the letter “B”
means belted-bias ply construction.
(E) Rim Diameter:Diameter of the wheel in inches.
(F) Service Description:The service description
indicates the load range and speed rating of a tire.
The load index can range from 1 to 279. Speed ratings
range from “A” to “Z”. The light truck tire size example
above shows dual or single tire congurations.
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 5-64.
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 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.
5-61

Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. Reset oil life system. SeeEngine Oil
on page 5-16.An Emission Control Service.••
Visually check for any leaks or damage.See footnote (j).••
Inspect engine air cleaner lter. If necessary, replace lter. SeeEngine Air
Cleaner/Filter on page 5-21.An Emission Control Service. See footnote †.••
Rotate tires and check ination pressures and wear. SeeTires on page 5-55.••
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.•
6-5

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 5-16for 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 5-24for 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 5-55for further
details. Check to make sure the spare tire is stored
securely. Push, pull and then try to rotate or turn
the spare tire. If it moves, tighten it. SeeChanging a
Flat Tire on page 5-74.
6-10

Erasing HomeLink®Buttons..............................2-45
Event Data Recorders (EDR)............................7-10
Exit Lighting...................................................3-19
Express Down Window....................................2-16
Extender, Safety Belt.......................................1-26
Exterior Lamps...............................................3-16
F
Filter
Engine Air Cleaner......................................5-21
Finding a Program Type (PTY)
Station (RDS and XM™)..............3-69, 3-80, 3-95
Finding a Station............................3-67, 3-78, 3-93
Finish Care....................................................5-92
Finish Damage...............................................5-93
Fixed Mast Antenna.......................................3-122
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-73
Flat Tire, Changing.........................................5-74
Fluid
Automatic Transmission................................5-22
Power Steering...........................................5-37
Windshield Washer......................................5-38
FM Stereo....................................................3-120
Fog Lamps....................................................3-18
Following Distance..........................................4-62
Four-Wheel Drive....................................2-26, 5-49
Front Axle......................................................5-50Front Storage Area.........................................2-47
Fuel............................................................... 5-4
Additives...................................................... 5-6
California Fuel.............................................. 5-5
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-6
Gage.........................................................3-50
Gasoline Octane........................................... 5-4
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-50
Fuel Information..............................................3-52
FUEL LEVEL LOW.........................................3-62
Fuses
Fuses and Circuit Breakers...........................5-97
Windshield Wiper.........................................5-96
G
Gage
Check Gages Warning Light..........................3-49
Engine Coolant Temperature.........................3-42
Fuel..........................................................3-50
Oil Pressure...............................................3-46
Speedometer..............................................3-37
Tachometer.................................................3-37
Voltmeter Gage...........................................3-40
Garage Door Opener.......................................2-42
6

Ination - Tire Pressure...................................5-64
Instrument Panel
Cluster.......................................................3-36
Overview..................................................... 3-4
Instrument Panel Brightness.............................3-18
Interior Lamps................................................3-18
J
Jump Starting.................................................5-43
K
Keyless Entry System....................................... 2-5
Keys............................................................... 2-3
L
Lamps
Exterior......................................................3-16
Interior.......................................................3-18
Lamps On Reminder.......................................3-17
Lap-Shoulder Belt...................................1-14, 1-22
LATCH System
Child Restraints...........................................1-40
Securing a Child Restraint Designed
or the LATCH System...............................1-42Leaving Your Vehicle.......................................2-13
Leaving Your Vehicle With the Engine
Running.....................................................2-32
LEFT REAR DOOR AJAR................................3-63
Liftgate Release..............................................2-14
Liftgate/Liftglass..............................................2-14
Liftglass/Liftgate..............................................2-14
Light
Air Bag Readiness.......................................3-38
Anti-Lock Brake System Warning...................3-42
Brake System Warning.................................3-40
Change Engine Oil......................................3-47
Charging System.........................................3-39
Check Gages Warning.................................3-49
Cruise Control.............................................3-48
Gate Ajar...................................................3-49
Low Fuel Warning.......................................3-50
Malfunction Indicator....................................3-43
Reduced Engine Power................................3-48
Safety Belt Reminder...................................3-38
Security.....................................................3-47
Service Four-Wheel-Drive Warning Light.........3-48
Lighted Visor Vanity Mirror...............................2-17
Listening to a DVD................................3-91, 3-105
Loading Your Vehicle.......................................4-49
Loading Your Vehicle for Off-Road Driving..........4-17
Locking Rear Axle...........................................4-11
Lockout Protection..........................................2-13
8

OOdometer......................................................3-37
Off-Road Recovery..........................................4-13
Oil
Change Engine Oil Light...............................3-47
Engine.......................................................5-16
Pressure Gage............................................3-46
OIL PRESSURE LOW/STOP
ENGINE.....................................................3-61
Older Children, Restraints................................1-27
Online Owner Center........................................ 7-4
OnStar
®Personal Calling.................................2-41
OnStar®Services............................................2-40
OnStar®System.............................................2-40
OnStar®Virtual Advisor....................................2-41
Operating Your All-Wheel-Drive Vehicle
Off Paved Roads.........................................4-16
Other Warning Devices...................................... 3-6
Outlet Adjustment...................................3-24, 3-30
Outside
Convex Mirror.............................................2-39
Curb View Assist Mirrors..............................2-39
Heated Mirrors............................................2-39
Manual Mirrors............................................2-38
Power Mirrors.............................................2-38
Overhead Console..........................................2-46
Owner Checks and Services.............................. 6-9
Owners, Canadian............................................... ii
Owner’s Information........................................7-13
PParental Control............................................3-106
Park (P)
Shifting Into................................................2-31
Shifting Out of............................................2-33
Parking
Brake........................................................2-29
Over Things That Burn.................................2-33
Parking on Hills..............................................4-64
PASSENGER DOOR AJAR..............................3-62
Passing.................................................4-13, 4-62
Passlock
®......................................................2-19
Personalization...............................................3-54
Personalization, Climate Controls......................3-34
Plan Ahead When Possible................................ 7-8
Playing a Cassette Tape..................................3-86
Playing a CD...............................3-74, 3-88, 3-100
Playing a Specic Loaded CD.........................3-101
Playing the Radio...........................3-66, 3-77, 3-93
Power
Accessory Outlets........................................3-21
Door Locks.................................................. 2-9
Electrical System.........................................5-96
Lumbar Controls........................................... 1-2
Reclining Seatbacks...................................... 1-4
Reduced Engine Light..................................3-48
Seat............................................................ 1-2
Steering Fluid.............................................5-37
Windows....................................................2-16
10