
•Vehicles with automatic
transmissions can tow in D (Drive)
but M (Manual Mode) is
recommended. See “Manual
Mode” inAutomatic Transmission
on page 8-26for more
information. Use a lower gear if
the transmission shifts too often.
For vehicles with a manual
transmission, it is better not
to use the highest gear.
•Use the cruise control when
towing.
•Obey speed limit restrictions.
Do not drive faster than the
maximum posted speed for
trailers, or no more than 90 km/h
(55 mph), to reduce wear on the
vehicle.
Driving with a Trailer
Towing a trailer requires experience.
Get familiar with handling and
braking with the added trailer weight.
The vehicle is now longer and not as
responsive as the vehicle is by itself.
Check all trailer hitch parts and
attachments, safety chains, electrical
connectors, lamps, tires and mirror
adjustments. If the trailer has electric
brakes, start the vehicle and trailer
moving and then apply the trailer
brake controller by hand to be sure
the brakes are working.
During the trip, check regularly to
be sure that the load is secure, and
the lamps and trailer brakes are
working properly.
Towing with a Stability
Control System
When towing, the sound of the
stability control system might be
heard. The system is reacting to the
vehicle movement caused by the
trailer, which mainly occurs during
cornering. This is normal when
towing heavier trailers.
Following Distance
Stay at least twice as far behind the
vehicle ahead as you would when
driving the vehicle without a trailer.
This can help to avoid situations that
require heavy braking and sudden
turns.
Passing
More passing distance is needed
when towing a trailer. Because the
rig is longer, it is necessary to go
much farther beyond the passed
vehicle before returning to the lane.
8-50 Driving and Operating

Backing Up
Hold the bottom of the steering
wheel with one hand. Then, to move
the trailer to the left, move that
hand to the left. To move the trailer
to the right, move your hand to
the right. Always back up slowly
and, if possible, have someone
guide you.
Making Turns
Notice:Making very sharp turns
while trailering could cause the
trailer to come in contact with the
vehicle. The vehicle could be
damaged. Avoid making very
sharp turns while trailering.
When turning with a trailer, make
wider turns than normal. Do this so
the trailer won’t strike soft shoulders,
curbs, road signs, trees or other
objects. Avoid jerky or sudden
maneuvers. Signal well in advance.
Turn Signals When Towing a
Trailer
The arrows on the instrument panel
flash whenever signaling a turn
or lane change. Properly hooked up,
the trailer lamps also flash, telling
other drivers the vehicle is turning,
changing lanes or stopping.
When towing a trailer, the arrows on
the instrument panel flash for turns
even if the bulbs on the trailer are
burned out. For this reason you
may think other drivers are seeing
the signal when they are not. It is
important to check occasionally to be
sure the trailer bulbs are still working.
Driving On Grades
Reduce speed and shift to a lower
gear before starting down a long or
steep downgrade. If the transmission
is not shifted down, the brakes might
have to be used so much that they
would get hot and no longer
work well.Vehicles with an automatic
transmission can tow in D (Drive).
Shift the transmission to a lower
gear if the transmission shifts
too often under heavy loads and/or
hilly conditions. For vehicles with
a manual transmission, it is
better not to use the highest gear.
When towing at high altitude on
steep uphill grades, consider the
following: Engine coolant will boil at
a lower temperature than at normal
altitudes. If the engine is turned off
immediately after towing at high
altitude on steep uphill grades,
the vehicle may show signs similar
to engine overheating. To avoid
this, let the engine run while
parked, preferably on level ground,
with the automatic transmission
in P (Park) for a few minutes
before turning the engine off.
Driving and Operating 8-51

For vehicles with manual
transmissions, let the engine run
while parked, preferably on level
ground, with the transmission out of
gear and the parking brake applied,
for a few minutes before turning the
engine off. If the overheat warning
comes on, seeEngine Overheating
on page 9-24.
Parking on Hills
{WARNING
Parking the vehicle on a hill with
the trailer attached can be
dangerous. If something goes
wrong, the rig could start to move.
People can be injured, and both
the vehicle and the trailer can be
damaged. When possible, always
park the rig on a flat surface.If parking the rig on a hill:
1. Press the brake pedal, but do not
shift into P (Park) yet for vehicles
with an automatic transmission,
or into gear for vehicles with a
manual transmission. Turn the
wheels into the curb if facing
downhill or into traffic if facing
uphill.
2. Have someone place chocks
under the trailer wheels.
3. When the wheel chocks are in
place, release the brake pedal
until the chocks absorb the load.
4. Reapply the brake pedal. Then
apply the parking brake and shift
into P (Park) for vehicles with an
automatic transmission or into
gear for vehicles with a manual
transmission.
5. Release the brake pedal.
Leaving After Parking on
a Hill
1. Apply and hold the brake pedal
while you:
•start the engine,
•shift into a gear, and
•release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is
clear of the chocks.
4. Stop and have someone pick up
and store the chocks.
8-52 Driving and Operating

Maintenance When Trailer
Towing
The vehicle needs service more
often when pulling a trailer. See this
manual’s Maintenance Schedule or
Index for more information. Things
that are especially important in trailer
operation are automatic transmission
fluid, engine oil, axle lubricant, belts,
cooling system and brake system.
It is a good idea to inspect these
before and during the trip.
Check periodically to see that all
hitch nuts and bolts are tight.
Engine Cooling When Trailer
Towing
The cooling system may temporarily
overheat during severe operating
conditions. SeeEngine Overheating
on page 9-24.
Trailer Towing
Before pulling a trailer, there are
three important considerations that
have to do with weight:
•The weight of the trailer.
•The weight of the trailer tongue.
•The total weight on your
vehicle’s tires.
Weight of the Trailer
How heavy can a trailer safely be?
It should never weigh more than
1,000 lbs (454 kg). But even
that can be too heavy.
It depends on how the rig is used.
For example, speed, altitude, road
grades, outside temperature and
how much the vehicle is used to pull
a trailer are all important. It candepend on any special equipment
on the vehicle, and the amount of
tongue weight the vehicle can carry.
See “Weight of the Trailer Tongue”
later in this section for more
information.
Maximum trailer weight is calculated
assuming only the driver is in the tow
vehicle and it has all the required
trailering equipment. The weight
of additional optional equipment,
passengers and cargo in the tow
vehicle must be subtracted from
the maximum trailer weight.
Ask your dealer/retailer for our
trailering information or advice, or
you can write us at our Customer
Assistance Offices. SeeCustomer
Assistance Offices on page 12-3
for more information.
Driving and Operating 8-53

Vehicle Care
General InformationGeneral Information...............9-2
California Proposition 65
Warning.............................9-2
California Perchlorate
Materials Requirements........9-3
Accessories and
Modifications.......................9-3
Vehicle ChecksDoing Your Own
Service Work......................9-4
Hood...................................9-5
Engine Compartment
Overview............................9-6
Engine Cover.......................9-9
Engine Oil..........................9-10
Engine Oil Life System.........9-13
Automatic Transmission
Fluid................................9-14
Manual Transmission Fluid. . . .9-15
Hydraulic Clutch..................9-15
Engine Air Cleaner/Filter.......9-16
Cooling System...................9-17
Engine Coolant...................9-19
Engine Overheating.............9-24
Power Steering Fluid............9-25Washer Fluid......................9-26
Brakes...............................9-27
Brake Fluid.........................9-28
Battery...............................9-29
Rear Axle...........................9-30
Starter Switch Check............9-31
Automatic Transmission
Shift Lock Control
System Check...................9-32
Ignition Transmission
Lock Check.......................9-32
Park Brake and P (Park)
Mechanism Check..............9-32
Wiper Blade Replacement......9-33Headlamp AimingHeadlamp Aiming................9-34
Bulb ReplacementBulb Replacement...............9-37
Halogen Bulbs....................9-37
High Intensity Discharge
(HID) Lighting....................9-37
Headlamps, Front Turn
Signal and Parking Lamps
(Base Vehicle)...................9-37
Headlamps, Front Turn
Signal and Parking Lamps
(Up-Level Vehicle)..............9-38
Daytime Running
Lamps (DRL)....................9-39
Fog Lamps.........................9-40Taillamps, Turn Signal, and
Stoplamps.........................9-40
License Plate Lamp.............9-40
Replacement Bulbs..............9-41
Electrical SystemElectrical System
Overload...........................9-41
Fuses and Circuit
Breakers...........................9-42
Engine Compartment
Fuse Block.......................9-42
Instrument Panel
Fuse Block.......................9-45
Rear Compartment
Fuse Block.......................9-46
Wheels and TiresTires..................................9-48
Winter Tires........................9-48
Tire Sidewall Labeling..........9-49
Tire Designations.................9-51
Tire Terminology and
Definitions.........................9-52
Tire Pressure......................9-54
Tire Pressure for
High-Speed Operation........9-56
Tire Pressure Monitor
System.............................9-56
Tire Pressure Monitor
Operation..........................9-57
Tire Inspection....................9-61
Vehicle Care 9-1

What to Do with Used Oil
Used engine oil contains certain
elements that can be unhealthy for
your skin and could even cause
cancer. Do not let used oil stay on
your skin for very long. Clean your
skin and nails with soap and water,
or a good hand cleaner. Wash or
properly dispose of clothing or rags
containing used engine oil. See the
manufacturer’s warnings about the
use and disposal of oil products.
Used oil can be a threat to the
environment. If you change your own
oil, be sure to drain all the oil from the
filter before disposal. Never dispose
of oil by putting it in the trash, pouring
it on the ground, into sewers, or into
streams or bodies of water. Recycle
it by taking it to a place that collects
used oil.
Automatic Transmission
Fluid
How to Check Automatic
Transmission Fluid
It is not necessary to check
the transmission fluid level.
A transmission fluid leak is the
only reason for fluid loss. If a leak
occurs, take the vehicle to your
dealer/retailer service department
and have it repaired as soon as
possible.
There is a special procedure
for checking and changing the
transmission fluid. Because this
procedure is difficult, you should
have this done at your dealer/
retailer service department.Contact your dealer/retailer for
additional information or the
procedure can be found in the
service manual. To purchase a
service manual, seeService
Publications Ordering Information
on page 12-12.
Change the fluid and filter at the
intervals listed inScheduled
Maintenance on page 10-2, and
be sure to use the fluid listed
inRecommended Fluids and
Lubricants on page 10-7.
9-14 Vehicle Care

Vehicle Storage
{WARNING
Batteries have acid that can burn
you and gas that can explode.
You can be badly hurt if you are
not careful. SeeJump Starting
on page 9-84for tips on working
around a battery without
getting hurt.
Infrequent Usage: If the vehicle
is driven infrequently, remove
the black, negative (−) cable
from the battery. This helps keep
the battery from running down.Extended Storage: For extended
storage of the vehicle, remove the
black, negative (−) cable from the
battery or use a battery trickle
charger. This helps maintain the
charge of the battery over an
extended period of time.
Rear Axle
When to Check Lubricant
It is not necessary to regularly
check rear axle fluid unless you
suspect there is a leak or you hear
an unusual noise. A fluid loss could
indicate a problem. Have it inspected
and repaired.
How to Check Lubricant
A. Fill Plug Hole
B. Drain Plug Hole
To get an accurate reading, the
vehicle should be on a level surface.
If the level is below the bottom
of the filler plug hole, add some
lubricant. Add enough lubricant to
raise the level to the bottom of the
filler plug hole.V6 Automatic Transmission
shown, V6 Manual Transmission,
V8 Automatic and Manual
transmission similar
9-30 Vehicle Care

What to Use
For 218 mm rear drive module
(RDM) V6 manual, V8 automatic
and V8 manual:
To add lubricant when the level
is low, use 75W-90 LS gear oil
(GM Part No. US 89021677
and 1052358, in Canada
Part No. 89021678 and 992694)
meeting GM Specification 9986226.
To completely refill after draining,
seeRecommended Fluids and
Lubricants on page 10-7. Then fill
to the bottom of the filler plug hole
with the Synthetic Gear Lubricant.
For 195 mm RDM V6 automatic:
To add lubricant when the level
is low, use 75W-90 gear Oil
(GM Part No. US 89021677,
in Canada Part No. 89021678)
meeting GM Specification 9986115.
To completely refill after draining,
seeRecommended Fluids and
Lubricants on page 10-7. Then fill
to the bottom of the filler plug hole
with the Synthetic Gear Lubricant.
Starter Switch Check
{WARNING
When you are doing this
inspection, the vehicle could move
suddenly. If the vehicle moves,
you or others could be injured.
1. Before starting this check,
be sure there is enough
room around the vehicle.
2. Firmly apply both the parking
brake and the regular brake.
SeeParking Brake on page 8-32.
Do not use the accelerator
pedal, and be ready to turn off
the engine immediately if it starts.3. For automatic transmission
vehicles, try to start the engine
in each gear. The vehicle
should start only in P (Park) or
N (Neutral). If the vehicle starts
in any other position, contact your
dealer/retailer for service.
For manual transmission
vehicles, put the shift lever in
Neutral, push the clutch pedal
down halfway, and try to start the
engine. The vehicle should start
only when the clutch pedal is
pushed down all the way to the
floor. If the vehicle starts when
the clutch pedal is not pushed
all the way down, contact your
dealer/retailer for service.
Vehicle Care 9-31