1993 GMC SIERRA tow

.;
Trajlering Package
PO339
If your vehicle comes with the Trailering Package, there is also 8 load rating
which includes the weight
of the vehicle and the trailer it tows. This rating is
called the Gross Combination Weight Rating (GCWR).
When you weigh your trailer, be sure
to include the weight of everything you
put in it. And, remember to figure the weight
of the people inside as part of
your load.
Your dealer can help you determine your GCWR.
Add-on Equipment
When you carry removable items, like snow plow. blades, you may need to
put a limit on how many people you carry inside your vehicle. Be sure to
weigh your -vehicle -before you buy and install the new equipment.
~____~~.. . __ ~
Your warranty doesn’t cover parts or components that fail because of
~ overloading. I
6-69 ..
ProCarManuals.com

Service & Appearance Care
Trailer Recommendations
You must subtract your hitch loads from the CWR for your vehicle. 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, see “Trailer Towing” in the Index.
If you want more information on curb weights, cargo weights, cargo wei\
ght
rating and the correct center of gravity zone for your vehicle, your dealer can
help you. Just ask for a copy of “Consumer Information, Truck-Cam\
per
Loading.”
Pickup Conversion lo. Chassis Cab
General Motors is aware that some vehicle owners may consider having the
pickup box removed and a commercial
or recreational body installed. Before
you do
so, first contact the GM Zone Office for your area for information on
such conversions. (See the “Warranty and Owner Assistance”\
booklet for
Zone Office.) Owners should be aware that, as manufactured, th\
ere are
differences between a chassis cab and a pickup with the box r\
emoved which may affect vehicle safety. The components necessary to adapt the pickup to
permit its safe use with a specialized body should be installed by a bod\
y
builder in accordance with the information available from the Z\
one Office.
Tires
We don’t make tires. Your new vehicle comes with high quali\
ty tires made by
a leading tire manufacturer. These tires are warranted by the \
tire
manufacturers and their warranties are delivered with every new \
vehicle.
If
your spare tire is a different brand than your road tires, you will have a tire
warranty folder from each of these manufacturers.
6-72
ProCarManuals.com

Service & Appearance Cam
Tire lnspecfion and Rotation
To make your tires last longer, have them inspected and rotated at the
mileages recommended in the Maintenance Schedule. See “Scheduled
Maintenance Services” in the Index.
Q
-
-
K2655
Use this rotation pattern.
If your vehicle has front tires with different load ratings or tread designs (such
as all season
vs. onloff road) than the rear tires, don’t rotate your tires \
front
to rear.
After the tires have been rotated, adjust the front and rear \
inflation pressure
as shown on the CertificationRire label. Make certain that all wheel nuts are
properly tightened. See “Wheel Nut Torque”
in the Index.
A Rust or dirt on a wheel, or on the parts to which -it is fastened, can
make the wheel nuts become loose after a time. The wh.eel could
come
off and cause an accident. When you change- a- :wheel, remove
’ any -rust or dirt from places where the wheel attaches to the vehicle:
,: In an emergency, you can use a cloth or paper towel to do this; but
3 be sure to use a scraper or wire brush later, if you need- to, to get
-T all the rust or dirf off. See “Changing a Flat Tire” in the Index.
6-78
ProCarManuals.com

Service & Appearance Care
Rinse the section with a clean, wet sponge.
Wipe off what’s left with a slightly damp paper towel or cloth.
Then dry it immediately with an air hose, a hair dryer or a heat lamp.
I
~~~
careful with a hair dryer or heat lamp. You could scorch me lauric.
Wipe with a clean cloth.
Using Solvent-Type Cleaner on Fabric
First, see if you have to use solvent-type cleaner at all. Some spots and
stains will clean
off better with just water and mild soap.
If you need to use it, then:
Gently scrape excess soil from the trim material with a clean,\
dull knife
or scraper. Use very little cleaner, light pressure and clean cloths
(preferably cheesecloth). Cleaning should start at the outside \
of the stain,
“feathering” toward the center. Keep changing to a clean section of the
cloth.
When you clean a stain from fabric, immediately dry the area with an
air hose, hair dryer,
or heat lamp to help prevent a cleaning ring. (See
previous NOTICE.)
Fabric Protection
Your vehicle has upholstery that has been treated with ScotchgardTM \
Fabric
Protector, a
3M product. ScotchgardTM protects fabrics by repelling oil and
water, which are the carriers of most stains. Even with this protection, you
still need to clean your upholstery often
to keep it looking new.
Further information on cleaning is available by calling 1-800-433-3296
(in
Minnesota, 1-800-642-61 67).
Special Cleaning Problems
Greasy or Oily Stains: Like grease, oil, butter, margarine, shoe polish, coffee
with cream, chewing gum, cosmetic creams, vegetable oils, wax c\
rayon, tar
and asphalt.
Carefully scrape off excess stain.
Then follow the solvent-type instructions above.
Shoe polish, wax crayon, tar and asphalt will stain if left on a vehicle
seat fabric. They should be removed as soon as possible. Be c\
areful,
because the cleaner will dissolve them and may cause them to bleed.
6-86
ProCarManuals.com

Service & Appearance Care
Don’t use abrasive cleaners on glass, because they may cause\
scratches.
Avoid placing decals on the inside rear window, since they may\
have to be
scraped
off later. If abrasive cleaners are used on the inside of the rear
window, an electric defogger element may be damaged. Any tempor\
ary
license should not be attached across the defogger grid.
Cleaning the Outside of the Windshield and Wiper Blades
If the windshield is not clear
blade chatters when running,
windshield.
Clean the outside windshield
(GM Part No. 1050011). The
you rinse it with water. after using the windshield washer, or
if the wiper
wax or other material may be on the blade or
with
GM Windshield Cleaner, Bon-Ami Powder@
windshield is clean
if beads do not form when
Clean the blade by wiping vigorously with a cloth soaked
in full strength
washer solvent. Then rinse the blade with water.
Wiper blades should be checked on a regular basis and replaced\
when worn.
Cleaning the Outside of Your Vehicle
The paint finish on your vehicle provides beauty, depth of color, gloss
retention and durability.
Washing Your Vehicle
The best way to preserve your vehicle’s finish is to keep it clean by washing
it often with lukewarm or cold water.
Don’t wash your vehicle in the direct rays of the sun. Don’t use strong soaps
or chemical detergents. Use liquid hand, dish or car washing (\
non-detergent)
soaps. Don’t use cleaning agents that contain acid or abrasi\
ves.
All cleaning
agents should be flushed promptly and not allowed to dry on the surface, or
they could stain.
Dry the finish with a soft, clean chamois or a 100% cotton
towel to avoid surface scratches and water spotting.
High pressure vehicle washes may cause water to enter your veh\
icle.
Finish Care
Occasional waxing or mild polishing of your vehicle may be necessary to
remove residue from the paint finish. You can get
GM approved cleaning
products from your dealer. (See “Appearance Care and Materia\
ls’’ in the Index,)
Your vehicle (except
C 3500 HD) has a “basecoat/clearcoat” paint finish The
clearcoat gives more depth and gloss to the colored basecoat.
ProCarManuals.com

VIN Code
Z
H
K
C
J
F
N
~~~
Engine Description
with 8500 GVWR and below 7~ ! .-
with 8501 GWVR and' above
4.3L V6/TBI
5.0L V8/TBI
5.7L V8/TBI
with 8500 GVWR and belowk=
*&$
with 8501 GVWR and abov-sd
6.2L V8IDiesel
L.
6.2L V8/Diesel >c<
6.5L V8/Diesel g$ c
7.4L V8/TBI I
Except 454 SS Model 'g
with 454 SS Model ;
J= tb-
-1
L..
HD LD
LD
HD
LD
HD
HD
HD LD
TO268
NOTE: TBI Is a throttle body injection system.
Selecting the Proper Maintenance Schedule
Here ,is how to tell which schedule to follow once you find the proper
maintenance chart to use.
MAINTENANCE SCHEDULE I
Is any one of these true for your vehicle?
Most trips are less than 4 miles (6 kilometers).
Most trips are less than 1.0 miles (16 kilometers), and the outside
temperatures are below freezing.
The engine is at low speed most of the time (as in door-to-door delivery,
You operate in dusty areas or off-road frequently.
You tow a trailer
stop-and-go traffic,
or commercial use).
n;r- .I '.
---. - .
-. . r- IA m. : .. 1: . >.' +--,-P~l*~ -L.
If any one (or more) of these is true for your driving, follow Schedule 1.
Schedule I is shown by a plus sign (t) on the chart. &
MAINTENANCE SCHEDULE II
Follow Schedule II ONLY if none of the above conditions are true. Schedule- -
II is shown by a dot (.) on the chart. I
-
L .. -
7-5
ProCarManuals.com

23. EXHAUST PRESSURE REGULATOR VALVE INSPECTION* -Check that
the valve works properly. Correct any binding. Inspect hoses fo\
r cracks, chafing or decay. Replace parts as needed.
24.
TIRE AND WHEEL ROTATION AND INSPECTION -For proper wear
and maximum tire life, rotate tires at the first
6,000 miles (1 0 000
kilometers) for Schedule I (t) or 7,500 miles (12 500 kilometers) for
Schedule
II (.) and then every 15,000 miles (25 000 kilometers)
thereafter. Follow the instructions and patterns shown in Section 6.
Check tires for uneven wear or damage.
If irregular or premature wear is
apparent, check wheel alignment. Also, check for damaged wheels.\
See
“Tires” in the Index for more information.
For dual wheels, whenever the vehicle, wheels, or fasteners are new,
have the wheel fastener torque set at the first 100,
1,000 and 6,000
miles (160, 1600 and 10
000 km).
For 3500 H.D. Models, block the tires opposite those being removed to
keep the vehicle from rolling.
25.
DRIVE AXLE SERVICE -Check readfront axle fluid level and add as
needed. Check constant velocity joints and axle seals for leaki\
ng.
Locking differential-Drain fluid at first oil change and refill. Check
fluid level and add as needed at subsequent oil changes.
In dusty
areas, or trailer towing applications drain fluid at every 15,0\
00 miles
(24 135 kilometers) and refill$
every oil change. In dusty areas, or trailer towing applications, drain
fluid every 15,000 miles
(24 135 kilometers) and refi1l.t
More frequent lubrication may be required on heavy-duty or off-road
use.
Standard differential -Check fluid level and add as needed at
26.
BRAKE SYSTEM INSPECTION -When the engine oil is changed,
inspect the lines and hoses for proper hookup, binding, leaks, \
cracks,
chafing, etc. Check the parking brake adjustment, and the fluid level in
the master cylinder.
A low fluid level can indicate worn disc brake pads
which may need to be sewiced.t
*An Emission Control Service
tA fluid
loss in these systems may indicate a problem. Have them
inspected and repaired at once.
7-2
1
ProCarManuals.com

To contact NHTSA, you may either call the Auto Safety Hotline tol\
l-free at
1-800-424-9393
(or 366-0123 in the Washington, D.C. area) or write to:
NHTSA, U.S. Department of Transportation, Washington, D.C. 20590. You can
also obtain other information about motor vehicle safety from t\
he Hotline.
Reporting Safety Defects to the
Canadian Government
If you live in Canada, and you believe that your vehicle has a safety defect,\

you should immediately notify Transport Canada, in addition to notifying
General Motors
of Canada Limited. You may write to: Transport Canada at
Box 8880, Ottawa, Ontario K1G 3J2.
Reporting Safety Defects to General
Motors
In addition to notifying NHTSA (or Transport Canada) in a situation like this.
we certainly hope you'll notify us. Please call us at 1-800-GMC-TR\
UCK
(1-800-462-8782),
or write: GMC Truck, Consumer Relations, 31 E. Judson
Street 1607-07, Pontiac, Michigan 48342-2230. In Canada, please \
call us at 1-800-263-3777 (English)
or 1-800-263-7854 (French). Or, write: General
Motors of Canada Limited, Customer Assistance Center, 1908 Colonel Sam
Drive, Oshawa, Ontario L1H 8P7.
Roadside Assistance
GMC Truck's Roadside Assistance provides stranded owners with
over-the-phone roadside repairs
or towing service for disabled vehicles. This
service combines the efforts of technically trained telephone representatives
with a network of GMC Truck's dealer services.
Just dial GMC Truck Roadside Assistance at 1-800-GMC-TRUCK
(1 -800-462-8782)
to reach a qualified representative who can assist you in
repair
or arrange a tow. Other recommended services can also be arranged
for situations such as retrieving locked-in keys, changing a tire, or delivering
gasoline, at a charge
to the owner. We also provide dealer information at no
charge such as location of the nearest GMC Truck dealer and their hours
of
operation.
Roadside Assistance is available 24 hours a day, seven days a \
week, 365
days a year, including weekends and holidays. Should you have \
any
questions about Roadside assistance, call the GMC Truck Roadside
Assistance Center
or Contact your dealer.
In Canada, call 1-800-268-6800 for details on Roadside Assistance.
8-5
ProCarManuals.com