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Service  Parts  Identification  Label 
You’ll find this label  on the  inside of the glove  box. 
It’s very helpful if you ever  need  to  order parts. On this label is: 
your VIN, 
the model  designation, 
0 paint information,  and 
a list  of all production  options and special equipment. 
Be  sure  that this label 
is not removed from  the vehicle. 
Add-on  Electrical  Equipment 
NOTICE: 
Don’t  add  anything  electrical  to your  vehicle  unless  you  check 
with  your  dealer  first.  Some  electrical  equipment  can  damage 
your  vehicle  and  the  damage  wouldn’t  be  covered  by  your 
warranty.  Some  add-on  electrical  equipment  can  keep  other 
components  from  working  as they  should. 
Your vehicle has  an air  bag  system. Before attempting to add anything 
electrical  to your vehicle,  see “Servicing  Your Air Bag-Equipped  Vehicle” 
in the Index. 
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Fuse Block 
The fuse block access 
door  is on the  driver’s 
side  edge 
of the 
instrument panel. 
Pull 
off  the  cover  to access 
the fuse block. 
You can  remove  fuses 
with  a fuse extractor. 
The  fuse  extractor  is 
mounted to the  fuse 
block access door. 
To remove  fuses  if  you don’t have  a  fuse extractor, hold the end  of the  fuse 
between  your thumb and index  finger and pull straight out. 
Be  sure  to  use  the correct fuse. If  you  ever have  a problem 
on the  road  and 
don’t have  a  spare  fuse,  you can “borrow”  one 
of the correct  value. Just pick 
some  feature  of your  vehicle that 
you can get along  without-like  the  radio 
or  cigarette  lighter-and  use  its fuse,  if 
it is of the value you need. Replace 
it  as  soon  as  you can.  See “Fuses and Circuit Breakers”  in  the Tndex  for 
more  information. 
Specification Charts 
Replacement  Parts 
Replacement  part numbers listed in this section are based on the latest 
information  available at the  time 
of printing,  and  are subject to  change. If a 
part listed in this manual  is not the same  as the part used in your vehicle 
when  it was built, 
or if  you  have any questions,  please contact your GM 
truck dealer. 
These  specifications  are  for  information 
only. If you have any questions,  see 
the  service  manual  for the  chassis  or refer 
to the body manufacturer’s 
publications. 
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Service  Replacement  Part  and  Filter 
Recommendations 
- Gasoline  Engines 
Engine 4.3L 
VTN Z 
Oil Filter  PFS2 
Air  Cleaner 
A 178CW 
Filter 
PCV  Valve  CV789C 
Spark 
Plugs* .CR43TS 
Fuel Filter  GF48 
1 
Radiator  Cap 
RC36 
5.0L 
H 
PF12183- 
A348C 
cv774c 
.CR43TS 
GF48 
1 
RC36 
5.7L 
K 
PF1218q A348C 
cv774c 
.CR43TS  GF38 
1 
RC36 
+Four  Wheel  Drive  Vehicle 
- use a PFS2  oil filter 
Wse AC  copper-cored  resistor type spark plugs 
Service  Replacement  Part  and  Filter 
Recommendations 
- Diesel  Engines 
Engine 6.5L 6.5L 
VIN P S 
Oil Filter  PF1218 
PF1218 
Air  Cleaner  A644C 
A 1236C 
Fuel  Filter  TP 
1006  TP 
1 006 
Surge 
Tank Cap  RC33  RC33 
7.41 
N 
PF1218 
A348C 
cv774c 
.CR43TS  GF48 
I 
RC36 
6.51 
F 
PF1218 
A 1236C 
TP 
I006 
RC33 
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LAMP OR BULB 
INSTRUMENT 
PANEL 
Daytime  Running 
Lamps Indicator? 
Charging  System 
Indicator  Lamp 
Instrument  Cluster 
Illumination 
Headlamp  Beam 
Indicator 
Directional  Signal 
Indicator 
Brake  Warning 
Indicator 
SIR (Air  Bag) 
Safety  Belt Warning 
Check  Gages  Indicator 
Malfunction  Indicator 
(“Service  Engine 
Soon”) Lamp 
Upshift  Indicator  Glow  Plugs  Lamp** 
Low  Coolant  Lamp** 
Water  in Fuel  Lamp** 
Service  Throttle  Soon 
Lamp** 
**Diesel  only 
“fanadian  Vehicles only 
TRADE NO. 
74 
74 
194 
74 
74 
74 
74 
74 
74 
74 
74 
74 
74 
74 
74 
1 
I 
6 
1 
2 
1 
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Scheduled Maintenance Services 
KEEP ENGINE OIL 
AT THE  PROPER 
LEVEL AND  CHANGE 
AS  RECOMMENDED 
Section 
This  section  covers the maintenance  required for your vehicle.  Your vehicle 
needs these  services to retain its safety, dependability  and emission  control 
performance. 
I protection 
Plan 
I 
Introduction 
Your Vehicle  and  the  Environment 
Proper  vehicle  maintenance  not only helps to keep  your  vehicle in good 
working  condition,  but also helps the environment.  All recommended 
maintenance  procedures  are important.  Improper vehicle  maintenance  or the 
removal 
of important  components  can  significantly  affect the quality  of  the 
air  we  breathe.  Improper 
fluid levels or even  the wrong tire  inflation can 
increase the  level of emissions  from  your  vehicle. 
To help protect our 
environment,  and 
to help keep  your vehicle  in good condition,  please 
maintain  your vehicle properly. 
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How This  Section  is  Organized 
The  remainder of this section is divided  into  five parts: 
“Part A: Scheduled  Maintenance  Services” shows  what to have  done and 
how  often.  Some 
of these services can  be complex, so unless  you are 
technically  qualified and have the necessary  equipment, you should  let your 
dealer’s  service  department or  another qualified  service center  do these 
jobs. 
If you  are skilled enough to  do some  work  on  your vehicle,  you  will 
probably  want  to get the service information 
GM publishes.  See  “Service 
Publications” 
in the Index. 
“Part B: Owner  Checks  and  Services” tells  you  what  should be checked 
whenever  you stop  for fuel. 
It also explains  what  you  can  easily do to help 
keep 
your vehicle in good  condition. 
“Part  C: Periodic  Maintenance  Inspections” explains  important 
inspections  that your 
GM dealer’s service department  or another qualified 
service  center  should perform. 
“Part D: Recommended Fluids and  Lubricants” lists some  products GM 
recommends  to help  keep your vehicle properly maintained.  These products, 
or  their  equivalents,  should be  used  whether  you do the  work  yourself  or 
have it  done. 
“Part E: Maintenance  Record” provides  a place for you to record the 
maintenance  performed  on your vehicle. Whenever  any maintenance 
is 
performed,  be sure  to write it down in this part.  This will help you 
determine  when your next maintenance should  be done. 
In addition, it is a 
good idea to keep your maintenance receipts. They  may be needed  to 
qualify your  vehicle for warranty repairs. 
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Part A: Scheduled  Maintenance  Services 
Using Your Maintenance Schedule 
We at General  Motors  want to help  you keep your vehicle in good working 
condition.  But  we don’t  know exactly  how you’ll  drive it. You  may  drive 
very  short  distances  only 
a few times  a week.  Or you  may  drive  long 
distances  all the time 
in very hot, dusty weather.  You  may use your vehicle 
in making  deliveries.  Or  you  may drive it to work, to  do  errands  or in many 
other  ways. 
Because 
of all  the different ways people  use their  GM vehicles, maintenance 
needs  varv. 
You may even  need more frequent  checks and replacements than 
you‘ll  find 
in the schedules in this  section. So please read  this section and 
note  how  you  drive. If you  have any  questions  on how  to keep your vehicle 
in good  condition.  see  your GM dealer. 
This  part  tells  you the maintenance  services  you should have  done and 
when 
you should  schedule  them. If you go to your  dealer  for  your service  needs, 
you’ll  know that  GM-trained  and  supported  service people 
will perform the 
work  using  genuine 
GM parts. 
The  proper  fluids  and  lubricants to use are listed 
in Part  D.  Make  sure 
whoever  services your  vehicle uses these. 
All parts  should  be replaced  and 
all  necessary  repairs  done before  you or anyone  else  drives  the vehicle. 
These  schedules  are  for  vehicles that: 
carry passengers and cargo  within recommended  limits. You will find 
these  limits  on your vehicle’s  CertificatiodTire  label.  See  “Loading 
Your  Vehicle“ 
in the Index. 
are  driven  on  reasonable  road surfxes  within  legal  driving limits. 
are driven  off-road in the recommended  manner.  See “Off Road 
Driving  With  Your  Four-wheel  Drive Vehicle” 
in the Index. 
use the recommended  unleaded fuel.  See “Fuel” in the index. 
Selecting  the  Right  Schedule 
The proper  maintenance  schedule for your vehicle  depends on which  engine 
you  have 
in your vehicle and  how  you  use your vehicle. 
Gasoline  engine  vehicles and diesel  engine  vehicles have different 
maintenance  requirements. 
If you have  a diesel  engine,  follow a schedule 
designated  for  diesel engine  vehicles only.  If  you have 
a gasoline  engine. 
you  must first  determine  whether your  engine has 
a light duty  or  a heavy 
duty  emissions  classification.  Follow a maintenance  schedule designated 
for 
for your  engine.  See  “Engine  Identification” in the Index  to find your 
engine‘s emission  classification. 
c easoline  engines with the emissions  classification  (light duty or heavy  duty) 
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If your engine has more  than one  emissions  classification, the classification 
is determined by the Gross  Vehicle  Weight  Rating  (GVWR) of your  vehicle 
as shown  on  the Certification  Label.  See “Loading  Your  Vehicle” 
in the 
Index. 
Once  you’ve determined your  engine type and, 
if necessary, emissions 
classification,  you’ll need to  decide which  of  the  two schedules  is  right  for 
your vehicle.  See Definitions  for Maintenance  Schedule 
I and Maintenance 
Schedule 
I1 following. 
Schedule  I Definition - Gasoline  Engines  With  Light  Duty 
Emissions 
Follow Maintenance  Schedule I if any  one of these  is true for your vehicle: 
iII Most  trips are  less than 5 to 10 miles (8 to 16 km). This  is particularly 
important  when outside temperatures  are  below freezing. 
0 Most trips include  extensive idling (such as frequent driving in 
stop-and-go  traffic). 
You operate your vehicle in dusty  areas  or off-road  frequently. 
0 You frequently  tow a trailer. 
Schedule 
I should also be  followed if the  vehicle  is  used  for  delivery 
service,  police, taxi, or other commercial  application. 
Schedule I Intervals - Gasoline  Engines  With  Light  Duty 
Emissions 
Every 
3,000 Miles (5 000 km) or 3 Months,  Whichever Occurs First 
Engine Oil and Filter  Change 
Chassis  Lubrication 
Drive Axle Service 
At 6,000 Miles (10 000 km) - Then  Every 12,000 Miles (25 000 km) 
Tire  Rotation 
Every 75,000 Miles (25 000 km) 
Air Cleaner Filter Inspection, if driving in dusty  conditions 
Front Wheel Bearing Repack 
(or at each brake  relining)  (2WD  Only) 
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