Page 333 of 412
6-64 Engine Compartment Fuse Relay Center
The fuse block is on the driver's side of the engine
compartment at the rear.
NAME CIRCUITS PROTECTED
SPARE Spare Fuse
A.I.R. Air Pump
BLOWER Front Blower Motor
ABS Electronic Brake Control Module
IGN B Ignition Switch
IGN A Starter Relay, Ignition Switch
BATT Instrument Panel Fuse Block
LIGHTING Instrument Panel Fuse Block,
Headlamp Switch
RH
-HDLP Right-hand Headlamp
(Export only)
LH
-HDLP Left-hand Headlamp
(Export only)
RH
-HIBM Right-hand High-beam Headlamp
(Export only)
LH
-HIBM Left-hand High-beam Headlamp
(Export only)
Page 334 of 412
6-65
NAME CIRCUITS PROTECTED
ETC Electronic Throttle Control
RR BLOWER Rear Auxiliary Blower
Motor Relays
FUEL SOL Fuel Solenoid
ENG
-I Heated O2 Sensors, Mass Air
Flow Sensor, Evap Canister Purge
Valve, Crankshaft Position Sensor,
Secondary Air Injection Relay
(Diesel), Water in Fuel Sensor
(Diesel), Fuel Heater (Diesel),
Glowplug Relay (Diesel),
Wastegate Solenoid (Diesel)
ECM
-I Ignition Coil, Camshaft Position
Sensor, VCM, Fuel Injectors,
Coil Driver
IGN
-E Air Conditioning Clutch Relay
SPARE Spare Fuse
SPARE Spare Fuse
SPARE Spare FuseNAME CIRCUITS PROTECTED
A/C Air Conditioning Clutch Relay
HORN Horn Relay, Underhood Lamp(s)
ECM
-B Fuel Pump Relay, VCM, PCM,
Fuel Pump and Engine Oil
Pressure Switch
SPARE Spare Fuse
SPARE Spare Fuse
AUX A Upfitter Provisions
AUX B Upfitter Provisions
A/C RELAY Air Conditioning
HORN RELAY Horn
A.I.R. RELAY Air
FUEL PUMP
RELAYFuel Pump
STARTER
RELAYStarter
ABS EXPORT
RELAYABS Export
Page 336 of 412
6-67
Capacities and Specifications
All capacities are approximate. When adding, be sure to fill to the appropriate level or as recommended in
this manual.
See refrigerant charge label under the hood for charge capacity information and requirements.
Engine Identification -- Gasoline Engines
EngineªVORTECº 4300 ªVORTECº 5000 ªVORTECº 5700 ªVORTECº 8100
Type V6 V8 V8 V8
VIN Code W M R G
Fuel System CSFI
1CSFI1CSFI1MFI2
Spark
Plug Gap0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)
Firing Order
1
-6-5-4-3-21-8-4-3-6-5-7-21-8-4-3-6-5-7-21-8-7-2-6-5-4-3
1Central Sequential Fuel Injection
2Sequential Fuel Injection
Page 337 of 412
6-68 Wheel Nut Torque
MODEL TORQUE
All
140 lb
-ft (190 N´m)
Cooling System Capacity
ENGINE VIN QTY Without Rear Heater QTY With Rear Heater
ªVORTECº 4300 V6 W 11.0 quarts (10.4 L) 14.0 quarts (13.2 L)
ªVORTECº 5000 V8 M 17.0 quarts (16.0 L) 20.0 quarts (18.9 L)
ªVORTECº 5700 V8 R 17.0 quarts (16.0 L) 20.0 quarts (18.9 L)
ªVORTECº 8100 V8 G 23.0 quarts (21.8 L) 26.0 quarts (24.6 L)
After refill, the level MUST be checked as outlined under ªEngine Cooling Systemº in Section 5.
Page 338 of 412
6-69 Crankcase Capacity
ENGINE VIN Quantity With Filter
ªVORTECº 4300 V6 W 4.5 quarts (4.3 L)
ªVORTECº 5000 V8 M 5.0 quarts (4.8 L)
ªVORTECº 5700 V8 R 5.0 quarts (4.8 L)
ªVORTECº 8100 V8 G 6.5 quarts (6.15 L)
After refill, the level MUST be rechecked. Add enough engine oil so that the fluid is within the proper operating
range. Variation in oil filter size and oil cooler drainback can cause different fill levels. See ªEngine Oilº in the Index.
Fuel Tank Capacity
TYPE QUANTITY MODEL TYPE
Standard Tank 31.0 U.S. gallons (117.3 L) Passenger and Cargo
Standard Tank 35.0 U.S. gallons (132.5 L) Cab and Chassis
Optional Tank* 55.0 U.S. gallons (208.1 L) Cab and Chassis
*159 inch wheelbase or 177 inch wheelbase
Page 339 of 412

6-70
Normal Maintenance Replacement Parts
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 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.
EngineªVORTECº 4300
V6ªVORTECº 5000
V8ªVORTECº 5700
V8ªVORTECº8100
V8
VIN W M R G
Oil Filter PF47 PF1218 PF1218 PF454
Air Cleaner Filter * A917C A917C A917C A917C
PCV Valve CV769C CV769C CV769C **
Spark Plugs
41
-932 41-932 41-932 TJ14R-P15
Fuel Filter GF481 GF481 GF481 GF481
Radiator Cap RC36 RC36 RC36 RC36
* Replace with ACDelco
Air Filter, Part No. A917C and for severe dusty conditions,
use ACDelco Air Filter, Part No. 1236C.
**8100 V8 has an internal PCV which does not require replacement.
Page 344 of 412

Scheduled Maintenance
7-5
Short Trip/City Definition
Follow the Short Trip/City Scheduled Maintenance if
any one of these conditions is true for your vehicle:
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
Most trips include extensive idling (such as frequent
driving in stop
-and-go traffic).
Most trips are through dusty areas.
You frequently tow a trailer or use a carrier on top of
your vehicle.
If the vehicle is used for delivery service, police, taxi
or other commercial application.
One of the reasons you should follow this schedule
if you operate your vehicle under any of these
conditions is that these conditions cause engine oil to
break down sooner.
Short Trip/City Intervals
Every 3,000 Miles (5 000 km): Engine Oil and
Filter Change (or 3 months, whichever occurs first).
Chassis Lubrication (or 3 months, whichever occurs
first). Drive Axle Service (or 3 months, whichever
occurs first).
Every 6,000 Miles (10 000 km): Tire Rotation.
Every 15,000 Miles (25 000 km): Diesel Engine Only:
Engine Air Cleaner Filter Inspection, if driving in
dusty conditions. Gasoline Engine Only: Noise
Shields Inspection (GVWR above 10,000 lbs. only).
Diesel Engine Only: Shields and Underhood
Insulation Inspection. Diesel Engine Only:
Thermostatically Controlled Engine Cooling Fan
Check (or every 12 months, whichever occurs first).
Diesel Engine Only: Air Intake System Inspection.
Front Wheel Bearing Repack (or at each brake
relining, whichever occurs first).
Page 345 of 412

Scheduled Maintenance
7-6
Short Trip/City Intervals
Every 24,000 Miles (40 000 km): Diesel Engine Only:
Fuel Cap Replacement, if driving in dusty conditions.
Every 30,000 Miles (50 000 km): Diesel Engine
Only: Engine Air Cleaner Filter Replacement.
Fuel Filter Replacement.
Every 50,000 Miles (83 000 km): Automatic
Transmission Service (vehicles over 8600 GVWR
or driven under severe conditions or equipped with
diesel engine).
Every 60,000 Miles (100 000 km): Engine Accessory
Drive Belt Inspection. If Equipped: Exhaust Gas
Recirculation System Inspection. Gasoline Engine
Only: Evaporative Control System Inspection.
Diesel Engine Only: Crankcase Depression Regulator
Valve (CDRV) System Check.
Short Trip/City Intervals
Every 100,000 Miles (166 000 km): Gasoline Engine
Only: Spark Plug Wire Inspection. Gasoline Engine
Only: Spark Plug Replacement. Gasoline Engine
Only: Automatic Transmission Service (normal
conditions). Gasoline Engine Only: Positive
Crankcase Ventilation (PCV) Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service (or every 60 months, whichever occurs first).
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.