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
Weight of the Trailer Tongue
The tongue load (A) of any trailer
is an important weight to measure
because it affects the total gross
weight of the vehicle. The Gross
Vehicle Weight (GVW) includes
the curb weight of the vehicle, any
cargo carried in it, and the people
who will be riding in the vehicle.
If there are a lot of options,
equipment, passengers or cargo in
the vehicle, it will reduce the tongue
weight the vehicle can carry, which
will also reduce the trailer weight the
vehicle can tow. If towing a trailer,
the tongue load must be added to
the GVW because the vehicle will be
carrying that weight, too. SeeVehicle
Load Limits on page 8-12for more
information about the vehicle’s
maximum load capacity.The trailer tongue (A) should weigh
10 to 15 percent of the total
loaded trailer weight (B).
After loading the trailer, weigh
the trailer and then the tongue,
separately, to see if the weights are
proper. If they aren’t, adjustments
might be made by moving some
items around in the trailer.
Total Weight on Your
Vehicle’s Tires
Be sure the vehicle’s tires are
inflated to the upper limit for cold
tires. These numbers can be found
on the Tire-Loading Information
label. SeeVehicle Load Limits on
page 8-12. Make sure not to go
over the GVW limit for the vehicle,
including the weight of the trailer
tongue.
8-54 Driving and Operating
Towing Equipment
Hitches
Use the correct hitch equipment.
See your dealer/retailer or a
hitch dealer for assistance.
•The rear bumper on the vehicle
is not intended for hitches.
Do not attach rental hitches
or other bumper-type hitches to
it. Use only a frame-mounted
hitch that does not attach to
the bumper.
•Will any holes be made in the
body of the vehicle when the
trailer hitch is installed? If there
are, seal the holes when the hitch
is removed. If the holes are not
sealed, dirt, water, and deadly
carbon monoxide (CO) from the
exhaust can get into the vehicle.
SeeEngine Exhaust on
page 8-25.
Safety Chains
Always attach chains between the
vehicle and the trailer. Cross the
safety chains under the tongue of
the trailer to help prevent the tongue
from contacting the road if it
becomes separated from the hitch.
Leave enough slack so the rig can
turn. Never allow safety chains to
drag on the ground.
Trailer Brakes
Does the trailer have its own
brakes? Be sure to read and follow
the instructions for the trailer brakes
so they are installed, adjusted and
maintained properly.
Because the vehicle has antilock
brakes, do not tap into the vehicle’s
brake system. If this is done,
both brake systems will not work
well, or at all.
Conversions and
Add-Ons
Add-On Electrical
Equipment
Notice:Do not add anything
electrical to the vehicle unless you
check with your dealer/retailer
rst. Some electrical equipment
can damage the vehicle and the
damage would not be covered
by the vehicle’s warranty. Some
add-on electrical equipment can
keep other components from
working as they should.
Add-on equipment can drain the
vehicle battery, even if the vehicle
is not operating.
The vehicle has an airbag system.
Before attempting to add anything
electrical to the vehicle, see
Servicing the Airbag-Equipped
Vehicle on page 2-32andAdding
Equipment to the Airbag-Equipped
Vehicle on page 2-33.
Driving and Operating 8-55
Tire Rotation.......................9-61
When It Is Time for
New Tires.........................9-62
Buying New Tires................9-63
Different Size Tires and
Wheels.............................9-65
Uniform Tire Quality
Grading............................9-65
Wheel Alignment and
Tire Balance.....................9-67
Wheel Replacement.............9-67
Tire Chains.........................9-68
If a Tire Goes Flat...............9-69
Tire Sealant and
Compressor Kit..................9-71
Storing the Tire Sealant
and Compressor Kit...........9-77
Tire Changing.....................9-77
Compact Spare Tire.............9-83
Jump StartingJump Starting.....................9-84
TowingTowing the Vehicle..............9-87
Recreational Vehicle
Towing.............................9-87
Appearance CareExterior Care......................9-88
Interior Care.......................9-92
General Information
For service and parts needs, visit
your dealer/retailer. You will receive
genuine GM parts and GM-trained
and supported service people.
Genuine GM parts have one of
these marks:
California Proposition 65
Warning
Most motor vehicles, including this
one, contain and/or emit chemicals
known to the State of California
to cause cancer and birth defects or
other reproductive harm. Engine
exhaust, many parts and systems
(including some inside the vehicle),
many fluids, and some component
wear by-products contain and/or
emit these chemicals.
9-2 Vehicle Care
6.2 L V8 Engine Cover
(L99 Engine shown
LS3 similar)
To remove:
1. Remove the engine oil fill
cap (A).
2. Lift the engine cover (B) to
disengage two front attachment
points.
3. Pull engine cover forward to
disengage from horizontal
rear attachments.
4. Reverse Steps 1 through 3 to
reinstall engine cover.
Engine Oil
Checking Engine Oil
It is a good idea to check the
engine oil level at each fuel fill.
In order to get an accurate reading,
the oil must be warm and the
vehicle must be on level ground.
The engine oil dipstick handle
is a yellow loop. SeeEngine
Compartment Overview on page 9-6
for the location of the engine oil
dipstick.
1. Turn off the engine and give the
oil several minutes to drain back
into the oil pan. If this is not done,
the oil dipstick might not show the
actual level.
2. Pull out the dipstick and clean
it with a paper towel or cloth,
then push it back in all the way.
Remove it again, keeping the tip
down, and check the level.
When to Add Engine Oil
If the oil is below the cross-hatched
area at the tip of the dipstick,
add at least one liter/quart of the
recommended oil. This section
explains what kind of oil to use.
For engine oil crankcase capacity,
seeCapacities and Speci cations
on page 11-2.
Notice:Do not add too much oil.
If the engine has so much oil
that the oil level gets above the
cross-hatched area that shows
the proper operating range,
the engine could be damaged.
SeeEngine Compartment Overview
on page 9-6for the location of the
engine oil fill cap.
Add enough oil to put the level
somewhere in the proper operating
range. Push the dipstick all the
way back in when through.
9-10 Vehicle Care
If No Steam Is Coming From
The Engine Compartment
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem may not be too
serious. Sometimes the engine can
get a little too hot when the vehicle:
•Climbs a long hill on a hot day.
•Stops after high-speed driving.
•Idles for long periods in traffic.
•Tows a trailer.
If the overheat warning is displayed
with no sign of steam:
1. Turn the air off.
2. Turn the heater on to the highest
temperature and to the highest
fan speed. Open the windows
as necessary.3. In heavy traffic, let the engine idle
in N (Neutral) while stopped. If it
is safe to do so, pull off the road,
shift to P (Park) or N (Neutral) and
let the engine idle.
If the temperature overheat gage is
no longer in the overheat zone or an
overheat warning no longer displays,
the vehicle can be driven. Continue
to drive the vehicle slow for about
10 minutes. Keep a safe vehicle
distance from the car in front of you.
If the warning does not come back
on, continue to drive normally.
If the warning continues, pull over,
stop, and park the vehicle right away.
If there is no sign of steam, idle
the engine for three minutes while
parked. If the warning is still
displayed, turn off the engine until it
cools down. Also, see “Overheated
Engine Protection Operating Mode”
later in this section.
Power Steering Fluid
The power steering fluid reservoir is
located under the engine cover on
the driver side toward the front of the
engine compartment. SeeEngine
Compartment Overview on page 9-6.
When to Check Power
Steering Fluid
It is not necessary to regularly
check power steering fluid unless
you suspect there is a leak in
the system or an unusual noise is
heard. A fluid loss in this system
could indicate a problem. Have the
system inspected and repaired.
Vehicle Care 9-25
3. With the latch open, pull the
wiper blade down towards
the windshield far enough to
release it from the J-hooked
end of the wiper arm.
4. Remove the wiper blade.
Allowing the wiper blade arm to
touch the windshield when no
wiper blade is installed could
damage the windshield. Any
damage that occurs would not be
covered by the vehicle warranty.
Do not allow the wiper blade arm
to touch the windshield.
5. Reverse steps 1 through 3 for
wiper blade replacement.Headlamp Aiming
The headlamp aiming system has
been preset at the factory.
If the vehicle is damaged in an
accident, the aim of the headlamps
may be affected and adjustment
may be necessary.
It is recommended that a
dealer/retailer adjust the headlamps.
To re-aim the headlamps yourself,
use the following procedure.
The vehicle should be properly
prepared as follows:
•The vehicle should be placed so
the headlamps are 7.6 m (25 ft)
from a light colored wall.
•The vehicle must have all four
tires on a level surface which
is level all the way to the wall.
•The vehicle should be placed so
it is perpendicular to the wall or
other flat surface.
•The vehicle should not have any
snow, ice, or mud on it.
•The vehicle should be fully
assembled and all other
work stopped while headlamp
aiming is being performed.
•The vehicle should be normally
loaded with a full tank of fuel and
one person or 75 kg (160 lbs)
sitting on the driver’s seat.
•Tires should be properly inflated.
Headlamp aiming is done with the
vehicle’s low-beam headlamps.
The high-beam headlamps will be
correctly aimed if the low-beam
headlamps are aimed properly.
9-34 Vehicle Care
The compact spare tire, if the
vehicle has one, is not included
in the tire rotation.
After the tires have been rotated,
adjust the front and rear inflation
pressures as shown on the Tire
and Loading Information label.
SeeTire Pressure on page 9-54
andVehicle Load Limits on
page 8-12.
Reset the Tire Pressure Monitor
System. SeeTire Pressure
Monitor Operation on page 9-57.
Make certain that all wheel
nuts are properly tightened.
See “Wheel Nut Torque” under
Capacities and Speci cations on
page 11-2.{WARNING
Rust or dirt on a wheel, or on the
parts to which it is fastened, can
make wheel nuts become loose
after time. The wheel could come
off and cause an accident. When
changing a wheel, remove any
rust or dirt from places where the
wheel attaches to the vehicle.
In an emergency, use a cloth or
a paper towel to do this; but be
sure to use a scraper or wire
brush later, if needed, to get all
the rust or dirt off. SeeIf a Tire
Goes Flat on page 9-69.
When It Is Time for
New Tires
Various factors, such as
maintenance, temperatures,
driving speeds, vehicle loading,
and road conditions influence
when you need new tires.
One way to tell when it is time for
new tires is to check the treadwear
indicators, which appear when the
tires have only 1/16 inch (1.6 mm)
or less of tread remaining.
9-62 Vehicle Care