height CHEVROLET ASTRO 1999 Owners Manual

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1-19
Shoulder Belt Height Adjuster
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.To move it down, push in at the top of the arrows and
move the height adjuster to the desired position. You can
move the adjuster up just by pushing up on the shoulder
belt guide. After you move the adjuster to where you
want it, try to move it down without pushing in to make
sure it has locked into position.
Adjust the height so that the shoulder portion of the belt
is centered on your shoulder. The belt should be away
from your face and neck, but not falling off
your shoulder.

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1-33 Servicing Your Air Bag-Equipped Vehicle
Air bags affect how your vehicle should be serviced.
There are parts of the air bag system in several places
around your vehicle. You don't want the system to
inflate while someone is working on your vehicle. Your
dealer and the Vehicle Service Manual have information
about servicing your vehicle and the air bag system. To
purchase a service manual, see ªService and Owner
Publicationsº in the Index.
CAUTION:
For up to 10 minutes after the ignition key is
turned off and the battery is disconnected, an air
bag can still inflate during improper service. You
can be injured if you are close to an air bag when
it inflates. Avoid wires wrapped with yellow tape
or yellow connectors. They are probably part of
the air bag system. Be sure to follow proper
service procedures, and make sure the person
performing work for you is qualified to do so.
The air bag system does not need regular maintenance.
Adding Equipment to Your Air
Bag-Equipped Vehicle
Q:If I add a push bumper or a bicycle rack to the
front of my vehicle, will it keep the air bags
from working properly?
A:As long as the push bumper or bicycle rack is
attached to your vehicle so that the vehicle's basic
structure isn't changed, it's not likely to keep the
air bags from working properly in a crash.
Q:Is there anything I might add to the front of the
vehicle that could keep the air bags from
working properly?
A:Yes. If you add things that change your vehicle's
frame, bumper system, front end sheet metal or
height, they may keep the air bag system from
working properly. Also, the air bag system may not
work properly if you relocate any of the air bag
sensors. If you have any questions about this, you
should contact Customer Assistance before you
modify your vehicle. (The phone numbers and
addresses for Customer Assistance are in Step Two
of the Customer Satisfaction Procedure in this
manual. See ªCustomer Satisfaction Procedureº in
the Index.)

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1-48
A forward-facing child restraint (C-E) positions a
child upright to face forward in the vehicle. These
forward
-facing restraints are designed to help
protect children who are from 20 to 40 lbs.
(9 to 18 kg) and about 26 to 40 inches (66 to
102 cm) in height, or up to around four years of
age. One type, a convertible restraint, is designed to
be used either as a rear
-facing infant seat or a
forward
-facing child seat.

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6-35
Your rear drum brakes don't have wear indicators, but if
you ever hear a rear brake rubbing noise, have the rear
brake linings inspected immediately. Also, the rear
brake drums should be removed and inspected each time
the tires are removed for rotation or changing. When
you have the front brake pads replaced, have the rear
brakes inspected, too.
Brake linings should always be replaced as complete
axle sets.
See ªBrake System Inspectionº in Section 7 of
this manual under Part C ªPeriodic
Maintenance Inspections.º
Brake Pedal Travel
See your dealer if the brake pedal does not return to
normal height, or if there is a rapid increase in pedal
travel. This could be a sign of brake trouble.
Brake Adjustment
Every time you make a brake stop, your disc brakes
adjust for wear.
If your brake pedal goes down farther than normal, your
rear drum brakes may need adjustment. Adjust them by
backing up and firmly applying the brakes a few times.
Replacing Brake System Parts
The braking system on a vehicle is complex. Its many
parts have to be of top quality and work well together if
the vehicle is to have really good braking. Your vehicle
was designed and tested with top
-quality GM brake
parts. When you replace parts of your braking
system
-- for example, when your brake linings wear
down and you have to have new ones put in
-- be sure
you get new approved GM replacement parts. If you
don't, your brakes may no longer work properly. For
example, if someone puts in brake linings that are wrong
for your vehicle, the balance between your front and
rear brakes can change
-- for the worse. The braking
performance you've come to expect can change in many
other ways if someone puts in the wrong replacement
brake parts.
Battery
Your new vehicle comes with an ACDelco Freedom

battery. When it's time for a new battery, we recommend
an ACDelco Freedom battery. Get one that has the
replacement number shown on the original
battery's label.

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6-50
NOTICE:
The wrong wheel can also cause problems with
bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper
height, vehicle ground clearance and tire or tire
chain clearance to the body and chassis.
See ªChanging a Flat Tireº in the Index for
more information.
Used Replacement Wheels
CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used or
how far it's been driven. It could fail suddenly
and cause an accident. If you have to replace a
wheel, use a new GM original equipment wheel.
Tire Chains
NOTICE:
If your vehicle has P235/65R15 size tires, don't
use tire chains. They can damage your vehicle
because there's not enough clearance.
Use another type of traction device only if its
manufacturer recommends it for use on your
vehicle and tire size combination and road
conditions. Follow that manufacturer's
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it's contacting your vehicle, and don't
spin your wheels.
If you do find traction devices that will fit, install
them on the rear tires.
NOTICE: (Continued)

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6-69
Normal Maintenance
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 Oil Filter AC Type PF52. . . . . . . . . . . . . . . .
Air Cleaner AC Type A1163C. . . . . . . . . . . . . . . . . . .
Positive Crankcase Ventilation
(PCV) Valve AC Type CV769C. . . . . . . . . . . . . . . .
Spark Plugs AC Type 41
-932 . . . . . . . . . . . . . . . . . . .
Spark Plug Gap 0.060 inches (1.52 mm). . . . . . . . . .
Fuel Filter AC Type GF481. . . . . . . . . . . . . . . . . . . . .
Thermostat GM Part No. 12559051. . . . . . . . . . . . . . .
Wiper Blades (Front) Trico 22110158, Pin Type. . . . .
18 inches (45.7 cm) Length
Wiper Blade (Rear)
Trico 22154396, Pin Type
14 inches (35.5 cm) Length
Vehicle Dimensions*
Length 189.8 inches (482 cm). . . . . . . . . . . . . . . . . . .
Width 77.5 inches (196.8 cm). . . . . . . . . . . . . . . . . . .
Height 76.0 inches (193.0 cm). . . . . . . . . . . . . . . . . . .
Wheelbase 111.0 inches (281.9 cm). . . . . . . . . . . . . .
Front Tread Width 65.1 inches (165.4 cm). . . . . . . . .
Rear Tread Width 65.1 inches (165.4 cm). . . . . . . . . .
*Figures reflect base equipment only.

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9-9
How to Wear Properly 1-17 . . . . . . . . . . . . . . . . . . . . . . . . .
Incorrect Usage 1-20, 1-60, 1-61 . . . . . . . . . . . . . . . . . . . .
Lap Belt 1-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lap-Shoulder 1-17 1-34 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Larger Children 1-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Questions and Answers 1-16 . . . . . . . . . . . . . . . . . . . . . . . .
Rear Seat Outside Passenger Positions 1-34 . . . . . . . . . . . .
Rear Seat Passengers 1-34 . . . . . . . . . . . . . . . . . . . . . . . . . .
Reminder Light 1-13, 2-60 . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing After a Crash 1-63 . . . . . . . . . . . . . . . . . . . . . . . .
Right Front Passenger Position 1-26 . . . . . . . . . . . . . . . . . .
Shoulder Belt Height Adjuster 1-19 . . . . . . . . . . . . . . . . . . .
Smaller Children and Babies, Cargo Vans 1-44 . . . . . . . . . .
Smaller Children and Babies, Except Cargo Vans 1-41 . . . .
Use During Pregnancy 1-25 . . . . . . . . . . . . . . . . . . . . . . . . .
Why They Work 1-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Chains 4-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Defects, Reporting 8-10, 8-11 . . . . . . . . . . . . . . . . . . .
Safety Warnings and Symbols iii. . . . . . . . . . . . . . . . . . . . . . .
Scheduled Maintenance
Long Trip/Highway 7
-29 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Long Trip/Highway Definition 7-6 . . . . . . . . . . . . . . . . . . .
Long Trip/Highway Intervals 7-7 . . . . . . . . . . . . . . . . . . . . .
Short Trip/City 7-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Trip/City Definition 7-5 . . . . . . . . . . . . . . . . . . . . . . .
Short Trip/City Intervals 7-5 . . . . . . . . . . . . . . . . . . . . . . . .
Scheduled Maintenance Services 7-4 . . . . . . . . . . . . . . . . . . . . Seatback
Latches 1
-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reclining 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seats
Manual Front 1
-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Lumbar Support 1-3 . . . . . . . . . . . . . . . . . . . . . . . .
Power 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removable Rear 1-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Restraint Systems 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Controls 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing a Child Restraint 1-52, 1-54, 1-56 . . . . . . . . . . . .
Tw o-Way Manual 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Second Gear 2-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security Light 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 6-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AWD Light 2-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulletins, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . .
Engine Soon Light 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manuals, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . .
Parts Identification Label 6-59 . . . . . . . . . . . . . . . . . . . . . . .
Publications, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . .
Work, Doing Your Own 6-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Service and Appearance Care 6-1 . . . . . . . . . . . . . . . . . . . . . .
Service and Owner Publications 8-11, 8-12 . . . . . . . . . . . . . .
Service Publications 8-11 8-12 . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Your Air Bag-Equipped Vehicle 1-33 . . . . . . . . . . .
Sheet Metal Damage 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-10
Shifting 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Into Park (P) 2-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Out of Park (P) 2-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shoulder Belt Height Adjuster 1-19 . . . . . . . . . . . . . . . . . . . . .
Skidding 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sound Equipment, Adding 3-29 . . . . . . . . . . . . . . . . . . . . . . . .
Spare Tire, Compact 5-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications and Capacities 6-67 . . . . . . . . . . . . . . . . . . . . . .
Speech Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . . .
Speedometer 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains, Cleaning 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter Switch Check 7-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steam 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Emergencies 4-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel, Tilt 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Compartments 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage, Vehicle 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stuck: In Sand, Mud, Ice or Snow 5-33 . . . . . . . . . . . . . . . . . .
Sun Visors 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sunglasses Storage 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols, Vehicle v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taillamp Bulb Replacement 6-41 . . . . . . . . . . . . . . . . . . . . . .
Tape Player Care 3-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature & Compass Display 2-46 . . . . . . . . . . . . . . . . . .
Theft 2-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft-Deterrent Feature 3-26 . . . . . . . . . . . . . . . . . . . . . . . . . .
THEFTLOCK
3-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Third Gear 2-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tilt Steering Wheel 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time, Setting 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire Chains 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire Loading 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information Label 4-28 . . . . . . . . . . . . . . . . . . .
Tires 6-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance 6-49 . . . . . . . . . . . . . . . . . . . . . . . .
Buying New 6-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Spare 5-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation 6-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation Check 7-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Rotation 6-45 . . . . . . . . . . . . . . . . . . . . . . . .
Loading 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure 6-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .