2005 CHEVROLET ASTRO CARGO VAN heater

If No Steam Is Coming From Your
Engine
If you get an engine overheat warning but see or hear
no steam, the problem may not be too serious.
Sometimes the engine can get a little too hot when you:
Climb a long hill on a hot day.
Stop after high-speed driving.
Idle for long periods in traffic.
Tow a trailer. See “Driving on Grades” under
Towing a Trailer on page 4-34.
If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. In heavy traffic, let the engine idle in NEUTRAL (N)
while stopped. If it is safe to do so, pull off the road,
shift to PARK (P) or NEUTRAL (N) and let the
engine idle.
2. Turn on your heater to full hot at the highest fan
speed and open the windows as necessary.If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about 10 minutes.
If the warning does not come back on, you can drive
normally.
If the warning continues and you have not stopped, pull
over, stop, and park your vehicle right away.
If there is still no sign of steam, you can push down the
accelerator until the engine speed is about twice as
fast as normal idle speed for at least three minutes while
you are parked. If you still have the warning,turn off
the engine and get everyone out of the vehicleuntil it
cools down.
You may decide not to lift the hood but to get service
help right away.
5-29

Cooling System
When you decide it is safe to lift the hood, here is what
you will see:
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C. Engine Cooling Fan
If the coolant inside the coolant recovery tank is boiling,
do not do anything else until it cools down. The
vehicle should be parked on a level surface.The coolant level should be at the ADD mark if the
engine is cold, or the FULL HOT mark if the engine is
warm. If it is not, you may have a leak at the pressure
cap or in the radiator hoses, heater hoses, radiator,
water pump or somewhere else in the cooling system.
{CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Do not touch them. If
you do, you can be burned.
Do not run the engine if there is a leak. If you
run the engine, it could lose all coolant. That
could cause an engine re, and you could be
burned. Get any leak xed before you drive the
vehicle.
If there seems to be no leak, start the engine again.
The engine cooling fan speed should increase when idle
speed is doubled by pushing the accelerator pedal
down. If it does not, your vehicle needs service. Turn off
the engine.
Notice:Engine damage from running your engine
without coolant is not covered by your warranty.
5-30

Notice:Using coolant other than DEX-COOL®may
cause premature engine, heater core or radiator
corrosion. In addition, the engine coolant may
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs rst. Any repairs
would not be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your vehicle.
How to Add Coolant to the Coolant
Recovery Tank
{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will. Your
vehicle’s coolant warning system is set for the
proper coolant mixture. With plain water or the
wrong mixture, your engine could get too hot
but you would not get the overheat warning.
Your engine could catch re and you or others
could be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.Notice:In cold weather, water can freeze and crack
the engine, radiator, heater core and other parts.
Use the recommended coolant and the proper
coolant mixture.
If you have not found a problem yet, but the coolant
level is not at the ADD mark, add a 50/50 mixture
ofclean, drinkable waterand DEX-COOL
®engine
coolant at the coolant recovery tank. SeeEngine
Coolant on page 5-25for more information.
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot
enough. Do not spill coolant on a hot engine.
When the coolant in the coolant recovery tank is at the
ADD mark, start your vehicle.
5-31

Fuse/Circuit
BreakerUsage
UPFITTER-
BATTUptter Battery Power Stud, Trailer
Wiring Harness
UPFITTER-
ACCYUptter Accessory Relay
SPARE Spare
SPARE Spare
SPARE Spare
ECM-1BFuel Pump Relay and Motor, VCM,
Oil Pressure Switch/Sender
HORN Horn Relay and Horn
A/C COMPAir Conditioning Enable Relay and
Compressor
RR HTR/AC Rear Heater and Air Conditioning
ATC Active Transfer Case-L Van
FRT HVAC Front Heater and Air Conditioning
ENG-IOxygen Sensors, Camshaft Position
Sensor, Mass Air Flow Sensor,
Evaporative Emission Canister Vent
SolenoidFuse/Circuit
BreakerUsage
IGN-E Air Conditioning Enable Relay Coil
ECM-IFuel Injectors 1–6, Crankshaft
Position Sensot, VCM, Coil Driver
Module (EST), Ignition Coil
BLANK Not Used
RH HDLMP Right Headlamp
LH HEADLAMP Left Headlamp
BLANK Not Used
BLANK Not Used
DIODE-1 Air Conditioning
BLANK Not Used
BLANK Not Used
BLANK Not Used
LIGHTINGCourtesy Fuse, Power Adjust
Mirrors Fuse, Truck Body Control
Battery Fuse
5-97

Capacities and Specications
The following approximate capacities are given in English and metric conversions. Please refer toPart D:
Recommended Fluids and Lubricants on page 6-29for more information.
Capacities and Specications
ApplicationCapacities
English Metric
Air Conditioning Refrigerant (R134a)
Front A/C 2.3 lbs 1.0 kg
Front and Rear A/C 3.0 lbs 1.4 kg
Cooling System
Without Rear Heater 13.5 qt 12.8 L
With Rear Heater 16.5 qt 15.6 L
Differential Fluid
Front Axle 2.6 pt 1.2 L
Rear Axle 3.5 pt 1.7 L
5-99

Check
Engine Light...............................................3-31
Gages Warning Light...................................3-36
Checking Things Under the Hood......................5-10
Chemical Paint Spotting...................................5-89
Child Restraints
Child Restraint Systems...............................1-42
Infants and Young Children...........................1-36
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-50
Older Children.............................................1-33
Securing a Child Restraint Designed for the
LATCH System........................................1-52
Securing a Child Restraint in a Center Rear
Seat Position...........................................1-55
Securing a Child Restraint in a Rear Outside
Seat Position...........................................1-53
Securing a Child Restraint in the Right Front
Seat Position...........................................1-57
Top Strap...................................................1-46
Top Strap Anchor Location............................1-48
Where to Put the Restraint...........................1-45
Cigarette Lighter.............................................3-18
Cleaning
Aluminum Wheels........................................5-88
Exterior Lamps/Lenses.................................5-86
Fabric/Carpet..............................................5-84
Finish Care.................................................5-87
Inside of Your Vehicle..................................5-83Cleaning (cont.)
Instrument Panel, Vinyl, and Other Plastic
Surfaces.................................................5-85
Leather......................................................5-85
Tires..........................................................5-88
Underbody Maintenance...............................5-89
Washing Your Vehicle...................................5-86
Weatherstrips..............................................5-86
Windshield and Wiper Blades........................5-87
Climate Control System...................................3-19
Outlet Adjustment........................................3-21
Rear Air Conditioning System........................3-22
Rear Heating System...................................3-22
Comfort Guides, Rear Safety Belt.....................1-31
Compact Spare Tire........................................5-82
Control of a Vehicle.......................................... 4-5
Convenience Net............................................2-38
Coolant
Engine Temperature Gage............................3-30
Heater, Engine............................................2-19
Cooling System..............................................5-30
Cruise Control................................................3-11
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text
Telephone (TTY) Users............................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-5
3

Customer Assistance Information (cont.)
Reporting Safety Defects to General Motors....7-11
Reporting Safety Defects to the
Canadian Government..............................7-10
Reporting Safety Defects to the
United States Government.........................7-10
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information........7-11
D
Daytime Running Lamps..................................3-15
Defensive Driving............................................. 4-2
Doing Your Own Service Work........................... 5-4
Dome Lamps.................................................3-17
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Programmable Automatic Door Locks............... 2-7
Rear Doors.................................................2-11
Sliding Side Door.......................................... 2-8
Driver
Position, Safety Belt.....................................1-19
Driver Information Center (DIC).........................3-38
Driving
At Night.....................................................4-13
City...........................................................4-18
Defensive..................................................... 4-2
Drunken....................................................... 4-2Driving (cont.)
Freeway.....................................................4-19
Hill and Mountain Roads..............................4-21
In Rain and on Wet Roads...........................4-15
Rocking Your Vehicle to Get it Out.................4-28
Winter........................................................4-23
E
Electrical System
Add-On Equipment......................................5-92
Fuses and Circuit Breakers...........................5-93
Headlamp Wiring.........................................5-92
Instrument Panel Fuse Block.........................5-93
Power Windows and Other Power Options......5-92
Underhood Fuse Block.................................5-96
Windshield Wiper Fuses...............................5-92
Engine
Air Cleaner/Filter.........................................5-21
Battery.......................................................5-40
Check and Service Engine Soon Light............3-31
Coolant......................................................5-25
Coolant Heater............................................2-19
Coolant Temperature Gage...........................3-30
Cooling System Inspection............................6-28
Cover........................................................5-17
Engine Compartment Overview......................5-12
Exhaust.....................................................2-26
Fan Noise..................................................5-34
4

G
Gage
Check Gages Warning Light..........................3-36
Engine Coolant Temperature.........................3-30
Fuel..........................................................3-37
Oil Pressure...............................................3-34
Speedometer..............................................3-26
Voltmeter Gage...........................................3-28
Garage Door Opener.......................................2-29
Gasoline
Octane........................................................ 5-5
Specications............................................... 5-5
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-5
Headlamp Wiring............................................5-92
Headlamps
Automatic Headlamp System.........................3-16
Bulb Replacement.......................................5-48
Daytime Running Lamps...............................3-15
Flash-to-Pass............................................... 3-9
Front Turn Signal and Parking Lamps.............5-52
Halogen Bulbs............................................5-48
Headlamps and Sidemarker Lamps................5-48Headlamps (cont.)
High/Low Beam Changer................................ 3-9
On Reminder..............................................3-15
Headlamps and Sidemarker Lamps...................5-48
Heater...........................................................3-19
Highbeam On Light.........................................3-35
Highway Hypnosis...........................................4-21
Hill and Mountain Roads..................................4-21
HomeLink
®Wireless Control System.................2-29
HomeLink®Wireless Control
System Operation........................................2-30
Hood
Checking Things Under................................5-10
Release.....................................................5-10
Horn............................................................... 3-6
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-19
I
Ignition Positions.............................................2-17
Infants and Young Children, Restraints...............1-36
Ination -- Tire Pressure..................................5-61
Inspection
Brake System.............................................6-29
Engine Cooling System................................6-28
Exhaust System..........................................6-28
Fuel System...............................................6-28
Part C - Periodic Maintenance.......................6-28
6