Page 330 of 486

4. Remove the screws from the
bulb retainer and take the bulb
retainer off
of the
lamp assembly.
straight out of the
socket
.
5. Pull the old bulb
6. Put in a new bulb and push it in until it is tight.
7. Replace the bulb retainer.
8. Replace the rear lamp assembly and tighten the screws. You may want
to use a magnetic screwdriver when installing the screws.
9. Close the tailgate or rear doors.
Exhaust System
To help prevent damage to your exhaust system, do not continue to drive
your vehicle
if you notice:
Engine misfiring
Loss of performance
0 Exhaust system components hanging lower than normal
Loud exhaust system noises
0 Other unusual operating conditions
Have your engine and exhaust system serviced regularly.
Three- Way Catalytic Converter (Gasoline Engines)
Your vehicle’s three-way catalytic converter is designed to reduce the
pollutants
in your vehicle’s exhaust. Use only unleaded fuel in your vehicle.
If you use leaded fuel, you could damage your three-way catalytic converter
and other engine components.
Oxidation Catalytic Converter (Diesel Engines)
Your vehicle’s oxidation catalytic converter is designed to reduce the
particulates
in your vehicle’s exhaust. If your vehicle’s oxidation catalytic
converter ever needs to be replaced,
it must be replaced with an oxidation
converter intended for use
with diesel engines only.
6-53
ProCarManuals.com
Page 331 of 486

Engine Control Module System
Gasoline Engines
This system has an oxygen sensor (OS) that helps keep your engine’s
air-fuel mixture at a proper
level. Use only unleaded fuel in your vehicle. If
you use leaded fuel, you could damage your oxygen sensor (OS) and
three-way catalytic converter.
Diesel Vehicles Below 8,500 (3 850 Kg) GVWR
This system monitors engine speed and throttle position. It adjusts exhaust
gas recirculation to limit emissions.
Malfunction Indicator (SERVICE ENGINE SOON)
Light
The Malfunction Indicator (SERVICE ENGINE SOON) Light on your
instrument panel lets you know when your emission system needs service.
The light will come on briefly
when you start your engine to let you know
that the system is working.
If it does not come on when you start your
engine, or if
it comes on and stays on while you’re driving, your system
may need service. Your vehicle should still be driveable, but
you should
have your system serviced right away.
Secondary Air Injection Reaction (AIR) System
(Gasoline Engines)
You may have this system. It has a control valve that will direct air to where
it is needed. If the AIR system needs service, your Malfunction Indicator
(SERVICE ENGINE
SOON) Lamp on your instrument panel will come on.
Tires
We don’t make tires. Your new vehicle comes with high-quality 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.
6-54
ProCarManuals.com
Page 349 of 486
Vehicle Identification Number (VIN)
This is the legal identifier for your vehicle. It appears on a plate in the front
corner
of the instrument panel, on the driver’s side. You can see it if you
look through the windshield from outside your vehicle. The VIN also
appears
on the Vehicle Certification and Service Parts labels and the
certificates of title and registration.
Engine Identification
The eighth character in your VIN is the engine code. This code will help
you identify your engine, specifications, and replacement parts.
6-72
ProCarManuals.com
Page 353 of 486

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 Index 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.
Engine Identification - Gasoline Engines
Engine
Type
VIN Code
Fuel System Emissions
7.4L
V8
N
TBI? HD
*Light Duty Emissions
with 8,500 lbs. (3 850 Kg) GVWR and below.
**Heavy Duty Emissions over
8,500 Ibs. (3 850 Kg) GVWR.
?Throttle Body Injection
6-76
ProCarManuals.com
Page 354 of 486
Engine Identification - Diesel Engines
Engine Type
VTN Code
Fuel System
Wheel Nut Torque
MODEL
C 1500
K 1500, C-K 2500
C-K 2500
6.5L
V8
S
Turbo Diesel
DESCRIPTION
5 bolts (14mm)
6 bolts
(1 4mm)
8 bolts ( 14mm)
Cooling System Capacity
ENGINE
5.7L
6.5L
6.5L 7.4L
VIN
K
S
F
N
6.5L
V8
F
Turbo Diesel
TORQUE
120 ft. Ibs. ( 160 N*m)
120 ft. Ibs. (1 60 Nom)
I20
ft. lbs. ( 160 Nom)
QTY Without
Rear Heater*
1 7.5 Quarts
( 16.5 Liters)
23.5 Quarts (22.2 Liters)
23.5 Quarts
(22.2 Liters)
25 Quarts
(23.5
Liters)
QTY With
Rear Heater4’
20 Quarts (1 9
Liters)
27.5 Quarts (26
Liters)
27.5 Quarts (26
Liters)
27.5 Quarts (26
Li ters)
After refill. the level MUST be checked
as outlined under “Engine Cooling
System” in Section 5.
‘$All quantities are approximate.
6-77
ProCarManuals.com
Page 355 of 486
Crankcase Capacity
ENGINE
5.7L
6.5L
6.5L
7.4L
VIN
K
S
F
N
QUANTITY WITH
FILTER?
5 Quarts (4.8 Liters)
7 Quarts (6.5 Liters)
7 Quarts (6.5 Liters)
7 Quarts (6.5 Liters)
After refill, the level
MUST be checked as outlined under “Engine Oil And
Filter Recommendations”
in Section 5.
All quantities are approximate.
?Oil filter should be changed at EVERY oil change.
Fuel Tank Capacity
TYPE
Gasoline/Diesel
Utility Models - Standard
Suburban
- Standard
QUANTITY
30 Gallons ( I 1 3 Liters)
42 Gallons
( I59 Liters)
All quantities are for a completely dry tank and are approximate.
Service Replacement Part and Filter
Recommendations
- Gasoline Engines
Engine
VIN
Oil Filter
Air Cleaner Filter
PCV Valve
Spark Plugs”
Fuel Filter
Radiator Cap
5.7L
K
PF1218T A348C
cv774c
CR43TS
GF48 1
RC36
?Four Wheel Drive Vehicle
- use a PF52 oil filter
*Use AC copper-cored resistor type spark plugs
7.4L
N
PF1218
A348C
cv774c
.CR43TS GF48
1
RC36
ProCarManuals.com
Page 356 of 486
Service Replacement Part and Filter Recommendations
- Diesel Engines
Engine
VIN
Oil Filter
Air Cleaner
Fuel Filter
Surge Tank
Cap
6SL
S
PF1218
A1236C
TP 1006
RC33
6.5L
F
PF1218
A 1236C
TP 1 006
RC33
Air Conditioning Refrigerants
Not all air conditioning refrigerants are the same. If the air conditioning
system
in your vehicle needs refrigerant, be sure the proper refrigerant is
used.
If you’re not sure, ask your GM dealer. For additional information, see
your “Warranty and Owner Assistance Information’’ booklet.
NOTICE:
R-134A refrigerant is not compatible with R-12 refrigerant in
an air conditioning system. R-12 in an R-134A system will cause
compressor failure, refrigerant oil sludge, or poor air
conditioning system performance.
Air Conditioning Refrigerant Capacity
TYPE
Refrigerant R-134A
Refrigerant
R- 134A
QTY
Front A/C 3.0 lbs. (1.360 kg)
Front and Rear A/C 4.25 Ibs. (1.927
kg)
6-79
ProCarManuals.com
Page 361 of 486
LAMP OR BULB
INSTRUMENT
PANEL
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
?Canadian Vehicles only
TRADE NO.
74
74
74
74
74
74
74
74
74
ProCarManuals.com