2002 GMC ENVOY tow

3-11 Ventilation System
For mild outside temperatures when little heating
or cooling is needed, use the panel outlet setting
(on the standard system) to direct outside air through
your vehicle. Air will flow through the instrument
panel outlets.
Your vehicle's flow
-through ventilation system supplies
outside air into the vehicle when it's moving. When the
vehicle is not moving, you can get outside air to flow
through by selecting any air delivery mode and any
fan speed.
Your vehicle has air outlets that allow you to adjust
the direction and amount of airflow inside the vehicle.
Move the outlet up or down and move the control in
the center of each outlet side
-to-side to direct the air
from the outlet. Use the thumbwheel under the outlet
to turn the outlet off. For the most efficient airflow
and temperature control, keep the outlet in the fully
opened position.
The rear seat outlets can be used to adjust the airflow
toward either seating area, the floor or upward. Move
the control in the center of each outlet in any direction
to direct airflow.

3-12
Ventilation Tips

Keep the hood and front air inlet free of ice, snow or
any other obstruction such as leaves. The heater and
defroster will work better, reducing the chance of
fogging your windows.

In cool damp weather, minimize your use of
recirculation to reduce the chance of fogging
your windows.

When you enter a vehicle with the standard system
in cold weather, select floor mode to supply air
through the floor outlets. Then turn the fan on high
for a few moments before driving away. This will
blow moist air from the intake outlets toward the
floor, not the windshield. It reduces the chance of
fogging your windows. If you have the electronic
system, the AUTO setting will do this for you.
Manual operation of the electronic system in the
floor mode will also supply air through the
floor outlets.

Keep the air path under the front seats clear of
objects. This helps air to circulate throughout
your vehicle.Comfort Control Steering Wheel Controls
(If Equipped)
If your vehicle has this
feature, you can control
certain comfort control
functions using the buttons
on your steering wheel.
(Fan): Press the up arrow to increase the fan speed
and the down arrow to decrease the fan speed.
(Temperature): Press the up arrow to increase the
temperature of the air flowing through the system and
the down arrow to decrease the temperature of the air
flowing through the system.

3-56
ProblemRecommended Action
The audio or
video skips
or jumps.The DVD could be dirty or
scratched. Try cleaning the DVD.
When I return to
the DVD from
the system menu,
sometimes it
plays from the
beginning and
sometimes from
where it left off.If the STOP button was pressed
once, it resumes play from where
it left off.
If the STOP button was pressed
twice, it will start at the beginning
of the DVD.
However, if a change was made to
the menu, the DVD will start from
the beginning, even if the STOP
button was only pressed once.
The fast forward,
fast reverse,
previous and
next functions
do not work.Some commands that do one thing
for DVDs will not always work
or perform the same function for
audio, CDs or games.
ProblemRecommended Action
My disc is
stuck in the
player. The
EJECT/LOAD
button does
not work.Press the EJECT/LOAD button on
the remote, or the STOP/EJECT
button on the DVD player.
Turn the power off, then on again.
I lost the
remote and/or
the headphones.See your dealer for assistance.
What is the best
way to clean
the screen?Pour some isopropyl or rubbing
alcohol on a clean cloth and wipe.
Sometimes
the wireless
headphone
audio cuts out
or buzzes for a
moment then it
comes back.This could be caused by
interference from cell towers
or by using your cell phone in
the vehicle.

4-
4-1
Section 4 Your Driving and the Road
Here you'll find information about driving on different kinds of roads and in varying weather conditions.
We've also included many other useful tips on driving.
4
-2 Defensive Driving
4
-3 Drunken Driving
4
-6 Control of a Vehicle
4
-6 Braking
4
-9 Traction Assist System (TAS)
(Two
-Wheel Drive Only)
4
-11 Steering
4
-13 Off-Road Recovery
4
-13 Passing
4
-15 Loss of Control
4
-16 Off-Road Driving with Your
Four
-Wheel-Drive Vehicle4
-30 Driving at Night
4
-32 Driving in Rain and on Wet Roads
4
-35 City Driving
4
-36 Freeway Driving
4
-37 Before Leaving on a Long Trip
4
-38 Highway Hypnosis
4
-38 Hill and Mountain Roads
4
-40 Winter Driving
4
-44 Recreational Vehicle Towing
4
-47 Loading Your Vehicle
4
-50 Adding a Snow Plow or Similar Equipment
4-50 Towing a Trailer

4-44
Then, shut the engine off and close the window almost
all the way to preserve the heat. Start the engine again
and repeat this only when you feel really uncomfortable
from the cold. But do it as little as possible. Preserve the
fuel as long as you can. To help keep warm, you can get
out of the vehicle and do some fairly vigorous exercises
every half hour or so until help comes.
Recreational Vehicle Towing
Recreational vehicle towing means towing your vehicle
behind another vehicle
-- such as behind a motorhome.
The two most common types of recreational vehicle
towing are known as ªdinghy towingº (towing your
vehicle with all four wheels on the ground) and ªdolly
towingº (towing your vehicle with two wheels on
the ground and two wheels up on a device know as
a ªdollyº).
With the proper preparation and equipment, many
vehicles can be towed in these ways. See ªDinghy
Towingº and ªDolly Towing,º following.Here are some important things to consider before you
do recreational vehicle towing:

What's the towing capacity of the towing
vehicle? Be sure you read the tow vehicle
manufacturer's recommendations.

How far will you tow? Some vehicles have
restrictions on how far and how long they can tow.

Do you have the proper towing equipment? See your
dealer or trailering professional for additional advice
and equipment recommendations.

Is your vehicle ready to be towed? Just as you would
prepare your vehicle for a long trip, you'll want to
make sure your vehicle is prepared to be towed. See
ªBefore Leaving on a Long Tripº in the Index.

4-45 Dinghy Towing
When towing your vehicle, turn the ignition off.
To prevent your battery from draining while towing,
remove the Ignition A and the Ignition B fuses from the
engine compartment fuse block. Be sure to reinstall the
fuse when you reach your destination. See ªFuses and
Circuit Breakersº in the Index.
Tw o
-Wheel-Drive Vehicles
Tw o
-wheel-drive vehicles, should not be towed with
all four wheels on the ground. Two
-wheel-drive
transmissions have no provisions for internal lubrication
while being towed. To properly tow these vehicles,
they should be placed on a platform trailer with all
four wheels off the ground.
In rare cases when it's unavoidable that a
two
-wheel-drive vehicle is to be towed with all
four wheels on the ground, the propeller shaft to
axle yoke orientation should be marked and the
propeller shaft removed following the applicable
service manual removal/installation procedure.
Dust or dirt can enter the back of the transmission
through the opening created by removing the propeller
shaft if proper protection is not provided. Also, check
the transmission fluid level before driving the truck.Four
-Wheel-Drive Vehicles
Use the following procedure to tow your vehicle:
1. Firmly set the parking brake.
2. Shift the transmission to PARK (P).
3. Securely attach the vehicle being towed to the
tow vehicle.

4-46
4. Shift the transfer case to NEUTRAL (N).
See ªFour
-Wheel Driveº in the Index for the
proper procedure to select the NEUTRAL position
for your vehicle.
5. Release the parking brake only after the vehicle
being towed is firmly attached to the towing vehicle.
6. Turn the ignition off. This unlocks the steering
column and reduces battery drain as long as the
Ignition A and Ignition B fuses are removed.
Unlocking the steering column will allow the
proper movement of the front wheels and tires
during towing.
CAUTION:
Shifting a four-wheel-drive vehicle's transfer
case into NEUTRAL can cause your vehicle to
roll even if the transmission is in Park (P). You or
others could be injured. Make sure the parking
brake is firmly set before you shift the transfer
case to NEUTRAL.
Dolly Towing
Your vehicle was not designed to be dolly towed. If you
need to tow your vehicle see ªDinghy Towingº earlier in
this section.
CAUTION:
Shifting a four-wheel-drive vehicle's transfer
case into NEUTRAL can cause your vehicle to
roll even if the transmission is in PARK (P).
You or others could be injured. Make sure the
parking brake is firmly set before you shift the
transfer case into NEUTRAL.

4-50
Adding a Snow Plow or
Similar Equipment
Your vehicle was neither designed nor intended for a
snow plow.
NOTICE:
Adding a snow plow or similar equipment to
your vehicle can damage it, and the repairs
wouldn't be covered by warranty. Do not install a
snow plow or similar equipment on your vehicle.
Towing a Trailer
CAUTION:
If you don't use the correct equipment and drive
properly, you can lose control when you pull a
trailer. For example, if the trailer is too heavy,
the brakes may not work well
-- or even at all.
You and your passengers could be seriously
injured. Pull a trailer only if you have followed
all the steps in this section. Ask your dealer for
advice and information about towing a trailer
with your vehicle.