air conditioning CHEVROLET ASTRO 1996 Owners Manual

Section 3 Comfort Controls and Audio Systems
I I
In this section you’ll find out how to operate the comfort
control and audio systems offered with your vehicle. Be
sure to read about the particular systems supplied with
your vehicle.
Comfort Controls
This section tells you how to make your air system work
for you. Your comfort control system uses ozone-friendly
R- 134a refrigerant.
With these systems,
you can control the heating, cooling
and ventilation
in your vehicle. Your vehicle also has
a flow-through ventilation system described later in
this section.
Heating/Air Conditioning System
If your vehicle has air conditioning, your heating/air
conditioning controls will
look like this.
3-1

Fan Knob
This control has four positions. To increase airflow,
turn the knob toward
HI. To decrease airflow, move it
toward
LO.
Temperature Knob
This knob is next to the fan knob. It selects the
temperature
of the air flowing into your vehicle. Move
the knob clockwise for warmer air. Move the knob
counterclockwise for cooler
air.
Function Knob
This knob is next to the temperature knob.
OFF: This setting turns the system off.
MAX A/C: This cools the air the fastest, by
recirculating the inside air. Move the temperature knob
all the way clockwise.
A/C: This setting brings in outside air and cools it.
I,.
+fl BI-LEVEL: This setting brings in outside air
through the heater floor vent and the instrument panel
vents.
If you move the temperature knob between hot
and cold, cooler air will come out
of the upper vents
while warmer air comes out of the floor vent. The air
conditioning compressor may operate in this setting to
cool the air.
+.
/J VENT The ax comes out at the vents on your
instrument panel. The air conditioning compressor will
not run in this position. Adjust the temperature knob for
warmer or cooler air.
+’ HEATER: Most of the air comes out near the
floor. The rest comes out from the defroster vents under
the windshield and at the front side windows.
+’ BLEND: With this setting, the heated outside air
comes
out both the heater vents and defroster vents.
Adjust the temperature knob for warmer or cooler air.
Most
of the air comes out near the windshield, with
some going
to the floor vents and front side windows.
we
DEFROST This setting operates the defroster.
3-2

Heating System Function Knob
If your vehicle does not have air conditioning, your
heater controls will look like this.
Fan Knob
This control has four positions, To increase airflow,
turn the knob toward
HI. To decrease airflow, move it
toward
LO.
Temperature Knob
This knob is next to the fan knob. It selects the
temperature
of the air flowing into your vehicle. Move
the knob clockwise for warmer air. Move
the knob
counterclockwise for cooler air. This
knob is next to the temperature knob. The function
knob allows
you to choose the direction of air delivery.
OFF: This setting turns the system off.
-a
# VENT The air comes out at the vents on y r
instrument panel.
+# BI-LEVEL: With this setting, the heated outside
air comes out both the instrument panel vents and
heater vents. Adjust the temperature knob for warmer
or cooler air.
+’, HEATER: Most of the air comes out near the
floor. The rest comes out from the defroster vents under
the windshield and at the front side windows.
+’, BLEND: With this setting, the heated outside
air comes
out both the heater vents and defroster vents.
Adjust
the temperature knob for warmer or cooler air.
+.
%
DEFROST This setting operates the defroster.
Most
of the air comes out near the windshield, with
some going to the floor vents and front side windows.
3-3

Rear Heating System (Option) Rear Air Conditioning System (Option)
You may have the optional rear heater. The three-speed
fan switch is
to the right of the radio. Turn the switch
toward
HIGH for higher airflow in the rear area. Turn
the switch to the
OFF position to turn the system off.
You may have rear air conditioning. The rear air
conditioning switch is located to
the right of the heater
controls. Turn the switch toward
HIGH for higher
airflow
in the rear area. Turn the switch to the OFF
position to turn the system off.
3-4

Air Conditioning
Before using your vehicle’s air conditioning, open the
windows to clear the vehicle of hot air. This reduces the
time it takes for your vehicle to cool down. Then keep
your windows closed for the air conditioner to work at
its best.
You can use MAX A/C with the temperature knob in the
blue area, when it’s really hot outside and you need to
cool the inside air quickly. MAX A/C lets
in only a little
air from the outside.
If you first use MAX A/C, you can then use A/C
with
the temperature knob in the blue area, as soon as the
vehicle has cooled down,
so outside air will be going
through your vehicle.
If your vehicle has rear air conditioning, setting
it on LO
may enhance the front A/C performance by allowing
trapped refrigerant in the rear lines to circulate. The
rear air conditioning system will only send cooled
air if the front system is on. It can still be used to
circulate air, even if the front system is off.
When the air conditioning, DEFROST or BLEND is on,
you may notice a slight increase or decrease
in engine
speed, due to compressor operation. This is normal
because
the system is designed to cycle the compressor
on and off to keep the desired temperature.
Heating
On cold days, use HEATER with the temperature knob
in the red area. Outside air will be brought in through
the floor outlets. The heater works best
if you keep your
windows closed while using it.
If you use the optional engine coolant heater before
starting your engine, your heating system will produce
warmer air faster to heat the passenger compartment in
cold weather. See “Engine Coolant Heater”
in the Index.
3-5

Defrosting
Use DEFROST to remove fog or ice from the
windshield quickly in extremely cold conditions. The
temperature knob should be in the red area and the fan
control toward high. The air conditioning compressor
may operate in this setting to dehumidify the air.
The
BLEND setting is useful for cold weather with a
large number of passengers or very humid conditions to
help keep the windshield clear.
Ventilation System
For mild outside temperatures when little heating or
cooling is needed,
use VENT to direct outside air
through your vehicle. Air will flow through the
instrument panel
vents.
Your vehicle’s flow-through ventilation system supplies
outside air
to the inside of your vehicle when it is
moving. With the side windows closed, air will flow into
the front air inlet grilles at the base
of the windshield,
through the vehicle and out the rear air exhaust valves.
Outside air will also enter the vehicle when the heater or
the air conditioning fan is running. Your
vehicle has air vents near the center and
on the
sides of the instrument panel that allow
you to adjust the
direction and the amount
of airflow inside the vehicle.
Push the vent up or down
to direct airflow to your
preference. Increase or reduce
the amount of airflow by
opening and closing the louvers. The vents rotate to
direct the airflow from side to side.
When
you close a vent, it will increase the flow of air
coming out
of any vents that are open.
3-6

If you have rear heating or rear air conditioning, you
will have adjustable vents in the rear of the vehicle to
help direct the airflow. The rear air conditioning vents
are located
in the headliner at the rear of the vehicle.
The rear heating vents are located next to the second
and third seat on the driver’s side
of the vehicle, near
the floor. You can move the vents to direct the flow of
air, or close
the vents altogether. When you close a vent,
it will increase the flow of air coming
out of any vents
that are open.
Ventilation Tips
Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defroster will work far better, reducing the
chance of fogging the inside of your windows.
Rear Window Defogger (Option)
If your vehicle has this option, the rear window will
have lines running across
the glass. These lines heat
your window.
For best results, clear the window
of as much snow or
ice as possible before using the rear window defogger.
. .. :. ,.
I
To turn on the rear window
defogger, find
the button
I to the left of the heater
controls with the defog
symbol
on it.
0 When you enter a vehicle in cold weather, turn the
blower
fan to HIGH for a few moments .before
driving
off. This helps clear the intake ducts of snow
and moisture, and reduces the chance of fogging the
inside
of your windows. Press the button until the light comes on, then release it.
The rear window defogger will
only work when the
ignition switch is in the RUN position.
3-7

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.
Refrigerant should be added only by a qualified
A/C technician.
Air Conditioning Refrigerant Capacity
VPe
R- 134a
R- 134a
System
C-60**
C-69***
*All quantities are approximate.
**Front
A/C only.
***Front and Rear
A/C.
Quantity*
2.00 Ibs. (0.91 kg)
3.00 lbs. (1.36 kg)
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.
6-68

. .. I. .
Section 9 Index
Accessory'power Outlet ......................... 2-49
Add-on Equipment
............................. 4-28
AirBag
....................................... 1-24
Adding Equipment
............................ 1-30
How Does it Restrain
.......................... 1-28
How it Works
................................ 1-26
Location
.................................... 1-26
Readiness Light
......................... 1.25. 2.54
What Makes it Inflate
.......................... 1-27
What Will
You See After it Inflates .... : .......... 1-28
When Should it Inflate
......................... 1-27
Aircleaner
.................................... 6-19
Air Conditioning
................................ 3-5
Air Conditioning Refrigerants
..................... 6-68
Alignment and Balance. Tire
...................... 6-47
All-Wheel Drive
.......................... 2.21. 6.23
Aluminum Wheels. Cleaning
....................... 6-55
Antenna. Fixed
................................. 3-28
Antifreeze
...................................... 6-25
Anti-Lock
Brake System Warning Light
................ 2-57. 4-6
Brakes
...................................... 4-6
knti-Theft. Radio
.............................. 3-23
Appearance Care
............................... 6-49
Appearance Care Materials
....................... 6-58
Arbitration Program
.............................. 8-7
Servicing
................................... 1-29
Ashtrays
...................................... 2-48
Audio Equipment. Adding
. : ...................... 3-2t
Automatic Audio Systems
.................................. 3-8
Transmission Check
........................... 7-42
Transmission Operation
........................ 2-18
Axle Front
....................................... 6-24
LockingRear
................................ 2-21
Rear
....................................... 6-25
Battery
...................................... 6-35
Jump Starting
................................. 5-2
Replacement. Remote Keyless Entry ............... 2-8
Warnings
...................................... 5-2
BBB Auto Line ................................. 8-7
Better Business Bureau Mediation
................... 8-5
Brake
Adjustment
...................... ........... 6-35
Fluid
..................................... ;.6-32
Master Cylinder
.............................. 6-32
Parking
..................................... 2-21
PedalTravel .................................. 6-32
Replacing System Parts
........................ 6-32
Trailer
...................................... 4-3:
Transmission Shift Interlock Check
............... 7-42
Wear
............................. : ......... 6-3'
9-1

Rear Air Conditioning System
.................... 3-4
Axle
....................................... 6-25
Heating System
............................... 3-4
Outside Seat Position
.......................... 1-3 I
Safety Belt Comfort Guides ..................... 1-36
SeatAudio
.................................. 3-22
Seatpassengers
.............................. 1-31
Storage
..................................... 2-40
Towing
................................ 5.11. 5.12
Window Defogger
............................. 3-7
Windshield Washer
........................... 2-3 I
Rearview Mirror ................................ 2-38
Reclining Front Seatbacks
......................... 1-3
Recovery Tank, Coolant
.......................... 5- 15
Refrigerants. Air Conditioning
.................... 6-68
Regulator.
Fuel ................................. 2- 16
Removable Rear Seats ............................ 1-8
Replacement Bulbs
...................................... 6-66
Parts
....................................... 6-69
Wheel
...................................... 6-47
Replacing Safety Belts
........................... 1-52
Reporting Safety Defects
.......................... 8-8
Restraints Checking
................................... 1-52
Child ....................................... 1-41
Head
........................................ 1-5
Replacing Parts After
a Crash ................... 1-52
Systemcheck
................................ 7-42
Reverse
....................................... 2-19
Right Front Passenger Position
.................... 1-3 I
Roadside Assistance .............................. 8-4 Roadside Assistance. Canadian
......... ....... 8-6
Rocking Your Vehicle
........................... 5-37
Rotation. Tires
...................... ...... 6-44
Safety Belt Extender
............................ 1-51
Safety Belt Comfort Guides
....................... 1-36
Safety Belts
................................... 1 . 11
Adults ...................................... 1-16
Care
....................................... 6-53
Center Passenger Position
...................... 1-34
Children
.................................... 1-38
Driver Position
............................... 1-16
Extender
.................................... 1-51
How
to Wear Properly ......................... 1-16
Incorrect Usage
.................... 1.19. 1-50, 1-51
LapBelt
.................................... 1-34
Lap-Shoulder
........................... 1 . 16, 1-3 1
Questions and Answers ........................ 1 . 15
Rear Seat Outside Passenger Positions
............ 1-31
Rear Seat Passengers
.......................... 1-31
Reminder Light
......................... 1 - 12. 2-54
Replacing Atter
a Crash ........................ 1-52
Right Front Passenger Position .................. 1-31
Shoulder Belt Height Adjuster
................... 1 . 18
Smaller Children and Babies. Cargo Vans .......... 1-40
Smaller Children and Babies. Except Cargo Vans
.... 1-38
Use During Pregnancy
......................... 1-30
WhyThey Work
.............................. 1-12
Safety Defects. Reporting ......................... 8-8
Safety Warnings and Symbols
....................... 111
Scheduled Maintenance Services .................... 7-3
Larger Children
.............................. 1-49
Safety Chains
.................................. 4-32
...
9-7