2004 GMC ENVOY XL towing

Automatic Transmission Fluid
When to Check and Change
A good time to check your automatic transmission uid
level is when the engine oil is changed.
Change both the uid and lter every 50,000 miles
(83 000 km) 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.
If you do not use your vehicle under any of these
conditions, change the uid and lter every
100,000 miles (166 000 km).
How to Check
Because this operation can be a little difficult, you may
choose to have this done at the dealership service
department.If you do it yourself, be sure to follow all the instructions
here, or you could get a false reading on the dipstick.
Notice:Too much or too little uid can damage
your transmission. Too much can mean that some
of the uid could come out and fall on hot engine
part or exhaust system parts, starting a re.
Too little uid could cause the transmission to
overheat. Be sure to get an accurate reading if
you check your transmission uid.
Wait at least 30 minutes before checking the
transmission uid level if you have been driving:
When outside temperatures are above 90°F (32°C).
At high speed for quite a while.
In heavy traffic-especially in hot weather.
While pulling a trailer.
To get the right reading, the uid should be at normal
operating temperature, which is 180°F to 200°F
(82°C to 93°C).
Get the vehicle warmed up by driving about
15 miles (24 km) when outside temperatures are
above 50°F (10°C). If it’s colder than 50°F (10°C),
drive the vehicle in THIRD (3) until the engine
temperature gage moves and then remains steady
for 10 minutes.
5-22

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
ller neck may be lower. If the level is lower, add
more of the proper DEX-COOL
®coolant mixture
through the ller neck until the level reaches
the base of the ller neck.8. Then replace the pressure cap. At any time during
this procedure if coolant begins to ow out of the
ller neck, reinstall the pressure cap. Be sure
the pressure cap is hand-tight.
Engine Fan Noise
This vehicle has a clutched engine cooling fan. When the
clutch is engaged, the fan spins faster to provide more air
to cool the engine. In most everyday driving conditions
the clutch is not engaged. This improves fuel economy
and reduces fan noise. Under heavy vehicle loading,
trailer towing, and/or high outside temperatures, the fan
speed increases when the clutch engages. So you may
hear an increase in fan noise. This is normal and should
not be mistaken as the transmission slipping or making
extra shifts. It is merely the cooling system functioning
properly. The fan will slow down when additional cooling
is not required and the clutch disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch disengages.
5-36

(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 5-24for 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.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.
6-9

Compass Calibration.......................................2-36
Compass Operation.........................................2-36
Compass Variance..........................................2-37
Content Theft-Deterrent....................................2-17
Control of a Vehicle.......................................... 4-6
Convenience Net............................................2-51
Coolant
Engine Temperature Gage............................3-42
Heater, Engine............................................2-23
Cooling System..............................................5-30
Cruise Control................................................3-12
Cruise Control Light........................................3-48
CURB VIEW ACTIVATED.................................3-63
Current and Past Model Order Forms................7-13
Customer Assistance Information
Courtesy Transportation.................................. 7-8
Customer Assistance for Text
Telephone (TTY) Users............................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Program for Persons with
Disabilities................................................ 7-6
Reporting Safety Defects to General Motors.......7-12
Reporting Safety Defects to the Canadian
Government............................................7-12
Reporting Safety Defects to the United States
Government............................................7-11
Roadside Assistance Program......................... 7-7
Service Publications Ordering Information........7-12D
Daytime Running Lamps (DRL).........................3-17
Defensive Driving............................................. 4-2
Defogging and Defrosting.........................3-23, 3-29
Delayed Locking.............................................2-10
Dinghy Towing................................................4-46
Doing Your Own Service Work........................... 5-3
Dolly Towing..................................................4-48
Dome Lamp Override......................................3-19
Dome Lamps.................................................3-20
Door
Delayed Locking..........................................2-10
Locks.......................................................... 2-8
Power Door Locks......................................... 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-13
Driver
Position, Safety Belt.....................................1-14
DRIVER DOOR AJAR.....................................3-62
Driver Information Center (DIC).........................3-51
DIC Operation and Displays..........................3-51
DIC Warnings and Messages........................3-60
Driving
At Night.....................................................4-30
City...........................................................4-34
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-35
4

Locks
Delayed Locking..........................................2-10
Door........................................................... 2-8
Leaving Your Vehicle....................................2-13
Lockout Protection.......................................2-13
Power Door.................................................. 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-13
Loss of Control...............................................4-14
Low Fuel Warning Light...................................3-50
Luggage Carrier..............................................2-48
Lumbar
Power Controls............................................. 1-2
M
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill.........................................6-10
At Least Once a Month................................6-10
At Least Once a Year..................................6-11
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-8
Maintenance Record....................................6-16
Maintenance Requirements............................. 6-2
Normal Maintenance Replacement Parts.........6-15
Owner Checks and Services........................... 6-9
Recommended Fluids and Lubricants.............6-13
Scheduled Maintenance................................. 6-4Maintenance Schedule (cont.)
Using Your................................................... 6-3
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-65
Making Turns.................................................4-62
Malfunction Indicator Light................................3-43
Matching Transmitter(s) to Your Vehicle............... 2-6
Memory Seat.................................................2-53
Message
DIC Warnings and Messages........................3-60
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico
and U.S. Virgin Islands)................................. 7-5
Mirror Operation.............................................2-36
Mirrors
Automatic Dimming Rearview with
OnStar®and Compass..............................2-36
Outside Convex Mirror.................................2-39
Outside Curb View Assist Mirrors...................2-39
Outside Heated Mirrors................................2-39
Outside Manual Mirrors................................2-38
Outside Power Mirrors..................................2-38
MyGMLink.com................................................ 7-4
N
Navigation/Radio System................................3-106
New Vehicle Break-In......................................2-19
Normal Maintenance Replacement Parts............6-15
9

Power Steering...............................................4-11
Programmable Automatic Door Locks.................2-10
Programmable Locking Feature.........................2-11
Programmable Unlocking Feature......................2-12
Programming the HomeLink
®Transmitter...........2-43
Q
Questions and Answers About Safety Belts.........1-13
R
Radiator Pressure Cap....................................5-27
Radio Data System (RDS)...............3-65, 3-76, 3-92
Radio Messages.....................................3-71, 3-83
Radios..........................................................3-64
Care of Your Cassette Tape Player...............3-121
Care of Your CD and DVD Player................3-122
Care of Your CDs and DVDs.......................3-122
Navigation/Radio System.............................3-106
Radio Personalization.................................3-119
Radio with Cassette and CD.........................3-76
Radio with CD............................................3-65
Radio with Six-Disc CD................................3-92
Rear Seat Audio........................................3-117
Setting the Time..........................................3-64
Theft-Deterrent..........................................3-119
Understanding Reception............................3-120Rainsense™ Wipers........................................3-10
RDS Messages..............................3-70, 3-82, 3-97
Reading Lamps..............................................3-20
REAR ACCESS OPEN....................................3-62
Rear Axle......................................................5-48
Locking......................................................4-11
Rear Climate Control System............................3-31
Rear Compartment Storage Panel/Cover............2-49
Rear Door Security Locks................................2-13
Rear Floor Storage Lid....................................2-51
Rear Safety Belt Comfort Guides......................1-24
Rear Seat Audio (RSA)..................................3-117
Rear Seat Entertainment System.....................3-106
Rear Seat Operation......................................... 1-5
Rear Seat Passenger Positions.........................1-21
Rear Seat Passengers, Safety Belts..................1-21
Rear Seats (Envoy XL)..................................... 1-7
Rear Storage Area..........................................2-49
Rear Underseat Fuse Block............................5-104
Rear Window Defogger............................3-24, 3-29
Rearview Mirror, Automatic Dimming
with OnStar
®and Compass..........................2-36
Reclining Seatbacks, Power............................... 1-4
Recommended Fluids and Lubricants.................6-13
Recreational Vehicle Towing.............................4-45
Reduced Engine Power Light............................3-48
Remote Control.............................................3-112
Remote Keyless Entry System............................ 2-5
Remote Keyless Entry System, Operation............ 2-6
11

T
Tachometer....................................................3-37
Taillamps
Turn Signal Lamps......................................5-52
Testing the Alarm............................................2-18
Theft-Deterrent, Radio....................................3-119
Theft-Deterrent Systems...................................2-17
Content Theft-Deterrent................................2-17
Passlock
®...................................................2-19
Throttle, Adjustable..........................................2-22
TIGHTEN FUEL CAP......................................3-63
Tilt Wheel........................................................ 3-7
Tire Sidewall Labeling......................................5-56
Tire Size.......................................................5-59
Tire Terminology and Denitions........................5-61
Tires.............................................................5-55
Buying New Tires........................................5-67
Chains.......................................................5-71
Changing a Flat Tire....................................5-74
If a Tire Goes Flat.......................................5-73
Ination - Tire Pressure................................5-64
Inspection and Rotation................................5-65
Spare Tire..................................................5-87
Uniform Tire Quality Grading.........................5-68
Wheel Alignment and Tire Balance.................5-69
Wheel Replacement.....................................5-69
When It Is Time for New Tires......................5-66
To Use the Engine Coolant Heater....................2-23Top Strap......................................................1-37
Top Strap Anchor Location...............................1-39
Torque Lock...................................................2-32
Total Weight on Your Vehicle’s Tires..................4-59
Towing
Recreational Vehicle.....................................4-45
Towing a Trailer..........................................4-55
Your Vehicle...............................................4-45
Traction
Assist System (TAS)...................................... 4-9
Trailer Brakes.................................................4-60
Trailer Wiring Harness.....................................4-66
Transfer Case................................................5-49
Transmission
Fluid, Automatic...........................................5-22
Transmission Operation, Automatic....................2-24
Transmission, Transaxle, Transfer Case
Unit Repair Manual......................................7-12
Transportation Options...................................... 7-9
Travel Note Recorder......................................2-47
Traveling to Remote Areas...............................4-18
Trip Information..............................................3-51
Trip Odometer................................................3-37
Turn and Lane Change Signals.......................... 3-8
TURN SIGNAL ON.........................................3-61
Turn Signal/Multifunction Lever........................... 3-7
Turn Signals When Towing a Trailer..................4-63
Two-Wheel-Drive Vehicles................................4-46
14