2004 CHEVROLET ASTRO CARGO VAN engine

Part C: Periodic Maintenance
Inspections
Listed in this part are inspections and services which
should be performed at least twice a year (for instance,
each spring and fall).You should let your dealer’s
service department do these jobs. Make sure any
necessary repairs are completed at once.
Proper procedures to perform these services may be
found in a service manual. SeeService Publications
Ordering Information on page 7-12.
Steering, Suspension and Front
Drive Axle Boot and Seal Inspection
Inspect the front and rear suspension and steering
system for damaged, loose or missing parts, signs of
wear or lack of lubrication. Inspect the power steering
lines and hoses for proper hook-up, binding, leaks,
cracks, chang, etc. Clean and then inspect the
drive axle boot seals for damage, tears or leakage.
Replace seals if necessary.
Exhaust System Inspection
Inspect the complete exhaust system. Inspect the body
near the exhaust system. Look for broken, damaged,
missing or out-of-position parts as well as open seams,
holes, loose connections or other conditions which
could cause a heat build-up in the oor pan or could let
exhaust fumes into the vehicle. SeeEngine Exhaust
on page 2-29.
Fuel System Inspection
Inspect the complete fuel system for damage or leaks.
Engine Cooling System Inspection
Inspect the hoses and have them replaced if they
are cracked, swollen or deteriorated. Inspect all pipes,
ttings and clamps; replace as needed. Clean the
outside of the radiator and air conditioning condenser.
To help ensure proper operation, a pressure test of
the cooling system and pressure cap is recommended
at least once a year.
6-26

Throttle System Inspection
Inspect the throttle system for interference or binding,
and for damaged or missing parts. Replace parts
as needed. Replace any components that have high
effort or excessive wear. Do not lubricate accelerator
and cruise control cables.
Transfer Case and Front Axle
(All-Wheel Drive) Inspection
Every 12 months, or at engine oil change intervals,
check front axle and transfer case and add lubricant
when necessary. A uid loss could indicate a problem.
Check and have it repaired, if needed. Check vent
hose at transfer case for kinks and proper installation.
Brake System Inspection
Inspect the complete system. Inspect brake lines
and hoses for proper hook-up, binding, leaks, cracks,
chang, etc. Inspect disc brake pads for wear and
rotors for surface condition. Inspect other brake parts,
including calipers, parking brake, etc. Check parking
brake adjustment. You may need to have your brakes
inspected more often if your driving habits or conditions
result in frequent braking.
6-27

Part D: Recommended Fluids
and Lubricants
Fluids and lubricants identied below by name,
part number or specication may be obtained from
your dealer.
Usage Fluid/Lubricant
Engine OilEngine oil which meets
GM Standard GM6094M and
displays the American Petroleum
Institute Certied for Gasoline
Engines starburst symbol.
GM Goodwrench oil meets all
the requirements for your vehicle.
To determine the proper viscosity
for your vehicle’s engine, see
Engine Oil on page 5-13.
Engine Coolant50/50 mixture of clean,
drinkable water and use only
DEX-COOL
®Coolant. See
Engine Coolant on page 5-26.
Hydraulic Brake
SystemDelco Supreme 11 Brake Fluid or
equivalent DOT-3 brake uid.
Usage Fluid/Lubricant
Windshield
Washer SolventGM Optikleen
®Washer Solvent.
Parking Brake
Cable GuidesChassis Lubricant
(GM Part No. U.S. 12377985,
in Canada 88901242) or
lubricant meeting requirements
of NLGI #2, Category LB
or GC-LB.
Power Steering
SystemGM Power Steering Fluid
(GM Part No. U.S. 89021184,
in Canada 89021186).
Automatic
TransmissionDEXRON
®-III Automatic
Transmission Fluid.
Key Lock
CylindersMulti-Purpose Lubricant,
Superlube (GM Part No. U.S.
12346241, in Canada 10953474).
Chassis
LubricationChassis Lubricant
(GM Part No. U.S. 12377985,
in Canada 88901242) or
lubricant meeting requirements
of NLGI #2, Category LB
or GC-LB.
6-28

Vehicle Data Collection and
Event Data Recorders
Your vehicle, like other modern motor vehicles,
has a number of sophisticated computer systems that
monitor and control several aspects of the vehicle’s
performance. Your vehicle uses on-board vehicle
computers to monitor emission control components to
optimize fuel economy, to monitor conditions for air bag
deployment and, if so equipped, to provide anti-lock
braking and to help the driver control the vehicle
in difficult driving situations. Some information may be
stored during regular operations to facilitate repair
of detected malfunctions; other information is stored only
in a crash or near crash event by computer systems
commonly called event data recorders (EDR).
In a crash or near crash event, computer systems, such
as the Air Bag Sensing and Diagnostic Module (SDM)
in your vehicle may record information about the
condition of the vehicle and how it was operated, such
as engine speed, brake applications, throttle position,
vehicle speed, safety belt usage, air bag readiness,
air bag performance data, and the severity of a collision.
This information has been used to improve vehicle
crash performance and may be used to improve crash
performance of future vehicles and driving safety.
Unlike the data recorders on many airplanes, these
on-board systems do not record sounds, such as
conversation of vehicle occupants.To read this information, special equipment is needed
and access to the vehicle or the SDM is required.
GM will not access information about a crash event or
share it with others other thanwith the consent of the vehicle owner or, if the
vehicle is leased, with the consent of the lessee,
in response to an official request of police or similar
government office,
as part of GM’s defense of litigation through the
discovery process, or
as required by law.
In addition, once GM collects or receives data, GM may
use the data for GM research needs,
make it available for research where appropriate
condentiality is to be maintained and need is
shown, or
share summary data which is not tied to a
specic vehicle with non-GM organizations for
research purposes.
Others, such as law enforcement, may have access to
the special equipment that can read the information
if they have access to the vehicle or SDM.
7-10

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 1-800-222-1020, or write:
Chevrolet Motor Division
Chevrolet Customer Assistance Center
P.O. Box 33170
Detroit, MI 48232-5170
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 Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Service Publications
Ordering Information
Service Manuals
Service Manuals have the diagnosis and repair
information on engines, transmission, axle,
suspension, brakes, electrical, steering, body, etc.
RETAIL SELL PRICE: $120.00
Transmission, Transaxle, Transfer
Case Unit Repair Manual
This manual provides information on unit repair
service procedures, adjustments, and specications
for GM transmissions, transaxles, and transfer cases.
RETAIL SELL PRICE: $50.00
7-12

A
Accessory Power Outlets.................................3-15
Activating the Theft-Deterrent Feature................3-45
Adding Equipment to Your Air Bag-Equipped
Vehicle.......................................................1-68
Adding Washer Fluid.......................................5-39
Additional Program Information........................... 7-9
Additives, Fuel................................................. 5-6
Add-On Electrical Equipment...........................5-100
Add-On Equipment..........................................4-34
Adjusting the Speakers (Balance/Fade)......3-38, 3-40
Air Bag
Readiness Light..........................................3-25
Air Bag System..............................................1-62
Adding Equipment to Your Air Bag-Equipped
Vehicle...................................................1-68
How Does an Air Bag Restrain?....................1-66
Servicing Your Air Bag-Equipped Vehicle.........1-67
What Makes an Air Bag Inate?....................1-65
What Will You See After an Air Bag Inates?......1-66
When Should an Air Bag Inate?...................1-65
Where Are the Air Bags?..............................1-64
Air Cleaner/Filter, Engine.................................5-21
Airbag Sensing and Diagnostic Module (SDM)....7-10
All-Wheel Drive...............................................5-50
All-Wheel Drive (AWD) System.........................2-25
All-Wheel-Drive Service Light............................3-33
AM ...............................................................3-47AM-FM Radio.................................................3-36
Antenna, Fixed Mast.......................................3-47
Anti-lock Brake System..................................... 4-7
Anti-Lock Brake, System Warning Light..............3-28
Appearance Care............................................5-91
Care of Safety Belts....................................5-94
Chemical Paint Spotting...............................5-97
Cleaning the Inside of Your Vehicle................5-92
Cleaning the Outside of Your Vehicle..............5-95
Finish Damage............................................5-97
Sheet Metal Damage...................................5-97
Underbody Maintenance...............................5-97
Vehicle Care/Appearance Materials................5-98
Weatherstrips..............................................5-94
Ashtrays........................................................3-16
Audio System(s).............................................3-35
AM-FM Radio.............................................3-36
Care of Your CD Player...............................3-47
Care of Your CDs........................................3-47
Fixed Mast Antenna.....................................3-47
Radio with CD............................................3-38
Rear Seat Audio (RSA)................................3-43
Setting the Time for Radios with
HR and MN Buttons.................................3-36
Setting the Time for Radios with
the Set Button.........................................3-36
Theft-Deterrent Feature................................3-44
Understanding Radio Reception.....................3-47
Automatic Headlamp System............................3-12
1

Chains, Tire...................................................5-76
Charging System Light....................................3-26
Check
Engine Light...............................................3-29
Gages Warning Light...................................3-34
Checking Brake Fluid......................................5-41
Checking Coolant............................................5-27
Checking Engine Oil........................................5-13
Checking Things Under the Hood....................... 5-9
Chemical Paint Spotting...................................5-97
Child Restraints
Child Restraint Systems...............................1-43
Infants and Young Children...........................1-38
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-51
Older Children.............................................1-35
Securing a Child Restraint Designed for
the LATCH System...................................1-54
Securing a Child Restraint in a Center
Seat Position...........................................1-56
Securing a Child Restraint in a Rear
Outside Seat Position...............................1-54
Securing a Child Restraint in the Right
Front Seat Position...................................1-58
Top Strap...................................................1-47
Top Strap Anchor Location............................1-49
Where to Put the Restraint...........................1-46
Cigarette Lighter.............................................3-16Cleaning
Inside of Your Vehicle..................................5-92
Outside of Your Vehicle................................5-95
Underbody Maintenance...............................5-97
Weatherstrips..............................................5-94
Cleaning Aluminum Wheels..............................5-96
Cleaning Exterior Lamps/Lenses.......................5-95
Cleaning Fabric/Carpet....................................5-92
Cleaning Glass Surfaces..................................5-94
Cleaning Interior Plastic Components.................5-94
Cleaning Leather............................................5-93
Cleaning the Top of the Instrument Panel...........5-93
Cleaning the Windshield and
Wiper Blades..............................................5-96
Cleaning Tires................................................5-97
Cleaning Vinyl................................................5-93
Climate Control System...................................3-17
Outlet Adjustment........................................3-19
Rear Air Conditioning System........................3-20
Rear Heating System...................................3-20
Compact Spare Tire........................................5-90
Composite Headlamps.....................................5-54
Control of a Vehicle.......................................... 4-5
Convenience Net............................................2-43
Coolant
Engine Temperature Gage............................3-28
Heater, Engine............................................2-21
Cooling System..............................................5-31
3

E
Electrical System
Add-On Equipment.....................................5-100
Fuses and Circuit Breakers.........................5-101
Headlamp Wiring.......................................5-100
Power Windows and Other Power Options....5-100
Windshield Wiper Fuses.............................5-100
Emissions Inspection and Maintenance
Programs...................................................3-31
Engine
Air Cleaner/Filter.........................................5-21
Battery.......................................................5-44
Check and Service Engine Soon Light............3-29
Coolant......................................................5-26
Coolant Heater............................................2-21
Coolant Temperature Gage...........................3-28
Cooling System Inspection............................6-26
Cover........................................................5-17
Drive Belt Routing......................................5-110
Engine Compartment Overview......................5-12
Exhaust.....................................................2-29
Fan Noise..................................................5-37
Oil .............................................................5-13
Overheating................................................5-29
Starting......................................................2-20
Engine Coolant Level Check.............................6-22Engine Oil Additives........................................5-16
Engine Oil Level Check...................................6-22
Entry Lighting.................................................3-14
Erasing HomeLink®Buttons..............................2-35
Event Data Recorders (EDR)............................7-10
Except Cargo Vans.................................1-38, 1-46
Exit Lighting...................................................3-14
Express-Down Window....................................2-16
Extender, Safety Belt.......................................1-34
Exterior Lamps...............................................3-12
F
Filter
Engine Air Cleaner......................................5-21
Finding a Station....................................3-37, 3-39
Finish Care....................................................5-95
Finish Damage...............................................5-97
Fixed Mast Antenna........................................3-47
Flash-to-Pass................................................... 3-7
Flat Tire........................................................5-77
Flat Tire, Changing.........................................5-78
Fluid
Automatic Transmission................................5-23
Power Steering...........................................5-38
Windshield Washer......................................5-39
5