Driving On Grades
Reduce speed and shift to a lower gear before you start
down a long or steep downgrade. If you don’t shift
down, you might have to use your brakes so much that
they would get hot and no longer work well.
If you have an automatic transmission, you can tow in
DRIVE (D). You may want to shift the transmission
to THIRD (3) or, if necessary, a lower gear if the
transmission shifts too often under heavy loads or hilly
conditions. If you have a manual transmission and
you are towing a trailer, it is better not to use SIXTH (6)
gear. Just drive in FIFTH (5) gear (or, as you need
to, a lower 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 you turn your
engine off immediately after towing at high altitude
on steep uphill grades, your 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 PARK (P) for a few
minutes before turning the engine off. For 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 you do get the overheat
warning, seeEngine Overheating on page 5-27.
Parking on Hills
{CAUTION:
You really should not park your vehicle, with a
trailer attached, on a hill. If something goes
wrong, your rig could start to move. People
can be injured, and both your vehicle and the
trailer can be damaged.
But if you ever have to park your rig on a hill, here’s
how to do it:
1. Apply your regular brakes, but don’t shift into
PARK (P) yet for an automatic transmission, or
into gear for a manual transmission. Turn your
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
regular brakes until the chocks absorb the load.
4. Release the regular brakes.
4-45
When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:
•Start your engine.
•Shift into a gear.
•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.
Maintenance When Trailer Towing
Your vehicle will need service more often when you’re
pulling a trailer. SeeScheduled Maintenance on
page 6-4for more information. Things that are especially
important in trailer operation are automatic transmission
fluid (don’t overfill), engine oil, axle lubricant, belt,
cooling system and brake system. Each of these is
covered in this manual. If you’re trailering, it’s a
good idea to review these sections before you start
your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
4-46
Trailer Wiring Harness
The trailer wiring is a four-wire harness assembly. The
wires are blunted and taped to the wiring harness.
The harness and wiring are stored under the vehicle on
the driver’s side. The harness has no connector and
should be wired by a qualified electrical technician. The
technician can use the following color code chart
when connecting the wiring harness to your trailer.
•Black: Ground wire.
•Yellow: Left turn lamps.
•Dark Green: Right turn lamps.
•Brown: Parking lamps.
Securely attach the harness to the trailer, then tape or
strap it to your vehicle’s frame rail. Be sure you
leave it loose enough so the wiring doesn’t bend or
break, but not so loose that it drags on the ground. Store
the harness in its original place. Wrap the harness
together and tie it neatly so it won’t be damaged.
Trailer Recommendations
You must subtract your hitch load from the Cargo
Weight Rating (CWR) for your vehicle. The CWR is the
maximum weight of the load your vehicle can carry.
The CWR does not include the weight of the people
inside, but you can figure about 150 lbs (68 kg) for each
seating position. The total cargo load must not be
more than the vehicle’s CWR. Make sure to weigh your
vehicle with your trailer attached, so that you won’t
go over the GVWR or the GAWR.
You’ll get the best performance if you spread out the
weight of your load the right way, and if you choose the
correct hitch and trailer brakes.
For more information, seeTowing a Trailer on page 4-35
earlier in this section.
4-47
Service............................................................5-3
Accessories and Modifications..........................5-3
California Proposition 65 Warning.....................5-3
Doing Your Own Service Work.........................5-4
Adding Equipment to the Outside of
Your Vehicle..............................................5-5
Fuel................................................................5-5
Gasoline Octane............................................5-5
Gasoline Specifications....................................5-6
California Fuel...............................................5-6
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-7
Filling the Tank..............................................5-8
Filling a Portable Fuel Container.....................5-10
Checking Things Under the Hood....................5-10
Hood Release..............................................5-11
Engine Compartment Overview.......................5-12
Engine Oil...................................................5-13
Engine Oil Life System..................................5-16
Engine Cover...............................................5-18
Engine Air Cleaner/Filter................................5-18
Automatic Transmission Fluid.........................5-20
Manual Transmission Fluid.............................5-22
Hydraulic Clutch...........................................5-23
Engine Coolant.............................................5-24
Coolant Surge Tank Pressure Cap..................5-27Engine Overheating.......................................5-27
Cooling System............................................5-29
Power Steering Fluid.....................................5-31
Windshield Washer Fluid................................5-31
Brakes........................................................5-32
Battery........................................................5-36
Jump Starting...............................................5-37
Rear Axle.......................................................5-42
Headlamp Aiming...........................................5-43
Bulb Replacement..........................................5-43
Halogen Bulbs..............................................5-44
Headlamps..................................................5-44
Front Turn Signal, Sidemarker and
Parking Lamps..........................................5-45
Taillamps, Turn Signal, and Stoplamps............5-47
Back-Up Lamps............................................5-48
Replacement Bulbs.......................................5-48
Windshield Wiper Blade Replacement..............5-49
Tires..............................................................5-51
Tire Sidewall Labeling...................................5-52
Tire Terminology and Definitions.....................5-54
Inflation - Tire Pressure.................................5-57
Tire Inspection and Rotation...........................5-59
When It Is Time for New Tires.......................5-59
Buying New Tires.........................................5-60
Section 5 Service and Appearance Care
5-1
Service
Your dealer knows your vehicle best and wants you to
be happy with it. We hope you will go to your dealer
for all your service needs. You will get genuine GM parts
and GM-trained and supported service people.
We hope you will want to keep your GM vehicle all GM.
Genuine GM parts have one of these marks:
Accessories and Modi cations
When you add non-GM accessories to your vehicle they
can affect your vehicle’s performance and safety,
including such things as, braking, stability, ride and
handling, emissions systems, aerodynamics, durability,
and electronic systems like antilock brakes, traction
control and stability control. Some of these accessories
may even cause malfunction or damage not covered
by warranty.
GM Accessories are designed to complement and
function with other systems on your vehicle. Your
GM dealer can accessorize your vehicle using genuine
GM Accessories. When you go to your GM dealer
and ask for GM Accessories, you will know that
GM-trained and supported service technicians will
perform the work using genuine GM Accessories.
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.
5-3