2008 GMC ENVOY tow

9(Off):Press this button to turn off the entire climate
control system. Outside air will still enter the vehicle, and
will be directed to the oor. Press the AUTO button, the
mode button, the fan arrows, or either temperature knob
to turn the system on.
C(Mode):Press this button to manually select the air
delivery mode to the oor, instrument panel, or windshield
outlets. The system will stay in the selected mode until
the mode button is pressed again or the AUTO button is
pressed.
Driver’s Side Temperature Knob:Turn this knob
clockwise or counterclockwise to raise or lower the
temperature on the driver’s side of the vehicle. The
display will show the temperature setting decreasing
or increasing and an arrow pointing toward the driver.
This knob can also adjust the passenger’s side
temperature setting if the two are linked.Passenger’s Side Temperature Knob:Turn this
knob clockwise or counterclockwise to manually raise or
lower the temperature on the passenger’s side of the
vehicle. The display will show the temperature setting
decreasing or increasing and an arrow pointing toward
the passenger. The passenger’s temperature setting
can be set to match and link to the driver’s temperature
setting by pressing and holding the AUTO button for
three seconds. When adjusting the driver’s side
temperature setting, the passenger’s side temperature
setting will follow and both arrows will appear on the
display. The passenger’s side temperature setting also
resets and relinks to the driver’s side temperature setting
if the vehicle has been off for more than three hours.
Outside Air Temperature Display
A new outside temperature reading will be displayed
if the vehicle has been off for more than three hours.
If the vehicle has been off for less than three hours,
the old temperature reading may be displayed because
underhood heat is affecting the true outside temperature.
Underhood heat can also affect the outside temperature
while the engine is running. It may also take
several minutes of driving before the display
updates to the actual outside temperature.
3-24

Automatic Operation
AUTO (Automatic):When automatic operation is
active, the system will control the inside temperature,
the air delivery mode, and the fan speed.
Use the steps below to place the entire system in
automatic mode:
1. Press the AUTO button.
When AUTO is selected, the air conditioning
operation and air outlet mode will be automatically
controlled. The air conditioning compressor will
run continuously when the outside temperature
is over approximately 40°F (4°C). The air inlet will
normally be set to outside air. If it’s hot outside,
the air inlet will automatically switch to recirculate
inside air to help quickly cool down your vehicle.
2. Set the driver’s and passenger’s temperature.
To nd your comfort setting, start with a 72°F (22°C)
temperature setting and allow about 20 minutes for
the system to adjust. Turn the driver’s or passenger’s
side temperature knob to adjust the temperature
setting as necessary. If you choose the temperature
setting of 60°F (15°C), the system will remain at
the maximum cooling setting. If you choose the
temperature setting of 90°F (32°C), the system will
remain at the maximum heat setting. Choosing either
maximum setting may not cause the vehicle to heat
or cool any faster.
Manual Operation
To change the current setting, select one of the
following:
w9x(Fan):This button allows you to manually
adjust the fan speed. Press the up arrow to increase fan
speed and the down arrow to decrease fan speed. The
display will change to show you the selected fan speed
and the driver’s side temperature setting for ve seconds.
C(Mode):Press this button to manually change the
direction of the airow in your vehicle. Keep pressing the
button until the desired mode appears on the display.
The display will change to show you the selected
air delivery mode and the driver’s temperature setting
for ve seconds.
H(Vent):This mode directs air to the instrument
panel outlets.
)(Bi-Level):This mode directs approximately half
of the air to the instrument panel outlets, then directs the
remaining air to the oor outlets. A little air is directed
toward the windshield and the side window outlets.
Cooler air is directed to the upper outlets and warmer
air to the oor outlets.
3-25

Brake System Warning Light
When the ignition is on, the brake system warning light
will come on when you set your parking brake. The light
will stay on if your parking brake does not release fully.
If it stays on after your parking brake is fully released, it
means your vehicle has a brake problem. A chime may
also sound when the light comes on.
Your vehicle’s hydraulic brake system is divided into
two parts. If one part is not working, the other part can
still work and stop you. For good braking, though,
you need both parts working well.
If the warning light comes on, there could be a brake
problem. Have your brake system inspected right away.This light should come on briey when you turn the
ignition key to RUN. If it does not come on then, have it
xed so it will be ready to warn you if there is a problem.
If the light comes on while you are driving, pull off the
road and stop carefully. You may notice that the pedal
is harder to push or the pedal may go closer to the
oor. It may take longer to stop. If the light is still on,
have the vehicle towed for service. SeeTowing
Your Vehicle on page 4-40.
{CAUTION:
Your brake system may not be working
properly if the brake system warning light is on.
Driving with the brake system warning light on
can lead to an accident. If the light is still on
after you have pulled off the road and stopped
carefully, have the vehicle towed for service.
United States
Canada
3-38

If the Light is Flashing
The following can prevent more serious damage to your
vehicle:
Reduce vehicle speed.
Avoid hard accelerations.
Avoid steep uphill grades.
If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops ashing and remains on steady,
see “If the Light Is On Steady” following.
If the light continues to ash, when it is safe to do so,
stop the vehicle. Find a safe place to park the vehicle.
Turn the ignition off, wait at least 10 seconds, and restart
the engine. If the light remains on steady, see “If the
Light Is On Steady” following. If the light is still ashing,
follow the previous steps and see your dealer/retailer
for service as soon as possible.
If the Light Is On Steady
You might be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. SeeFilling the Tank on page 5-8. The diagnostic
system can determine if the fuel cap has been left off orimproperly installed. A loose or missing fuel cap allows
fuel to evaporate into the atmosphere. A few driving trips
with the cap properly installed should turn the light off.
Did you just drive through a deep puddle of water?
If so, your vehicle’s electrical system might be wet.
The condition is usually corrected when the electrical
system dries out. A few driving trips should turn the
light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
Gasoline Octane on page 5-6. Poor fuel quality causes
the engine not to run as efficiently as designed. You
might notice this as stalling after start-up, stalling when
you put the vehicle into gear, misring, hesitation on
acceleration, or stumbling on acceleration — these
conditions might go away once the engine is warmed up.
This will be detected by the system and cause the light to
turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least
one full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn
off, your dealer/retailer can check the vehicle. Your
dealer/retailer has the proper test equipment and
diagnostic tools to x any mechanical or electrical
problems that might have developed.
3-43

Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance between the right and
the left speakers, push and release until BAL (balance)
displays. Turn to move the sound toward the right or the
left speakers.
To adjust the fade between the front and rear speakers,
push and release this knob until FADE or FAD displays.
Turn to move the sound toward the front or the rear
speakers.
To adjust the balance or the fade to the middle position
while it is displayed, push and hold the AUDIO knob.
On some radios, push the AUDIO knob, then push it
again and hold it until one beep is heard.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone or
speaker controls display. ALL CENTERED displays and a
beep is heard.
Finding a Program Type (PTY) Station
(RDS and XM™)
For all Radios except the MP3 Radio, select and nd a
desired PTY perform the following:
1. Press the TYPE button to activate program type
select mode. TYPE or P-TYPE and the last
selected PTY displays.
2. Turn the TYPE knob or press and release the
TYPE button to select a PTY.
3. Press either SEEK or TYPE arrow to select and to
go to the PTY’s rst station.
4. To go to another station within that PTY, press the
TYPE button, then press either SEEK or TYPE
arrow once.
5. Press either SEEK or TYPE arrow twice to exit the
program type select mode.
For the Base Radio, if the radio cannot nd the desired
program type, NONE displays and the radio returns
to the last station you were listening to.
3-71

Problem Recommended Action
After stopping the player, I
push Play but sometimes
the DVD starts where I
left off and sometimes at
the beginning.If the stop button was
pressed one time, the
DVD player resumes
playing where the DVD
was stopped. If the stop
button was pressed two
times the DVD player
begins to play from the
beginning of the DVD.
The auxiliary source is
running but there is no
picture or sound.Check that the DVD
player is in the auxiliary
source mode.
Check the auxiliary input
connections at both
devices.
My disc is stuck in the
player. The Load/Eject
button does not work.Turn the DVD power off,
then on, then press the
load/eject button on the
DVD player.
Do not attempt to forcibly
remove the disc from the
DVD player. This could
permanently damage the
disc and DVD player.Problem Recommended Action
Sometimes the wireless
headphone audio cuts out
or buzzes.Check for obstructions,
low batteries, reception
range, and interference
from cellular telephone
towers or by using your
cellular telephone in the
vehicle.
Check that the
headphones are facing
the front of the vehicle.
I lost the remote and/or
the headphones.See your dealer/retailer
for assistance.
The DVD is playing, but
there is no picture or
sound.Check that the DVD
player is in DVD mode.
The audio/video skips or
jumps.The DVD or CD could
be dirty, scratched, or
damaged.
The audio from the radio
for the Radio with
Six-Disc CD and XM™
has taken over the audio
from the DVD or CD when
using the wired
headphones.The RSE is working
correctly.
Use the wireless
headphones or have the
front seat passengers
listen to another audio
source.
3-98

Your Driving, the Road, and Your Vehicle..........4-2
Defensive Driving...........................................4-2
Drunk Driving.................................................4-2
Control of a Vehicle........................................4-3
Braking.........................................................4-3
Antilock Brake System (ABS)...........................4-4
Braking in Emergencies...................................4-5
Locking Rear Axle..........................................4-5
StabiliTrak
®System........................................4-6
Steering......................................................4-10
Off-Road Recovery.......................................4-12
Passing.......................................................4-12
Loss of Control.............................................4-12
Off-Road Driving...........................................4-13
Driving at Night............................................4-26
Driving in Rain and on Wet Roads..................4-27Before Leaving on a Long Trip.......................4-28
Highway Hypnosis........................................4-28
Hill and Mountain Roads................................4-29
Winter Driving..............................................4-30
If Your Vehicle is Stuck in Sand, Mud,
Ice, or Snow.............................................4-33
Rocking Your Vehicle to Get It Out.................4-34
Loading Your Vehicle....................................4-34
Adding a Snow Plow or Similar Equipment.......4-40
Towing..........................................................4-40
Towing Your Vehicle.....................................4-40
Recreational Vehicle Towing...........................4-40
Electronically Controlled
Air Suspension System..............................4-44
Towing a Trailer...........................................4-45
Section 4 Driving Your Vehicle
4-1

Rocking Your Vehicle to Get It Out
First, turn the steering wheel left and right to clear the
area around the front wheels. For four-wheel-drive
vehicles, shift into Four-Wheel High. Turn off any traction
or stability system. SeeStabiliTrak
®System on page 4-6.
Then shift back and forth between REVERSE (R) and a
forward gear, spinning the wheels as little as possible.
To prevent transmission wear, wait until the wheels stop
spinning before shifting gears. Release the accelerator
pedal while you shift, and press lightly on the accelerator
pedal when the transmission is in gear. By slowly
spinning the wheels in the forward and reverse directions,
you will cause a rocking motion that could free your
vehicle. If that does not get your vehicle out after a few
tries, it might need to be towed out. If your vehicle does
need to be towed out, seeTowing Your Vehicle on
page 4-40.
Loading Your Vehicle
It is very important to know how much weight your
vehicle can carry. This weight is called the vehicle
capacity weight and includes the weight of all
occupants, cargo, and all nonfactory-installed
options. Two labels on your vehicle show how
much weight it was designed to carry, the Tire
and Loading Information label and the Certication/
Tire label.
{CAUTION:
Do not load your vehicle any heavier than
the Gross Vehicle Weight Rating (GVWR),
or either the maximum front or rear Gross
Axle Weight Rating (GAWR). If you do,
parts on your vehicle can break, and it
can change the way your vehicle handles.
These could cause you to lose control
and crash. Also, overloading can shorten
the life of your vehicle.
4-34