1994 CHEVROLET ASTRO PASSENGER engine overheat

Downloaded from www.Manualslib.com manuals search engine Engine Overheating
If Steam Is Coming From Your Enaine
NOTICE:
If your engine catches fire because you keep driving with no
coolant, your vehicle can be badly damaged. The costly repairs \
would not be covered by your warranty.
5-11

Downloaded from www.Manualslib.com manuals search engine If No Steam Is Coming From Your Engine
If you get the 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.
0 Stop after high speed driving.
Idle for long periods in traffic.
0 Tow a trailer.
If you get the overheat warning
with no sign of steam, try this for a minute
or
so:
1. If you have an air conditioner, turn it off.
2. Turn on your heater to full hot at the highest fan speed and open the
3. If you’re in a traffic jam, shift to “N” (Neutral).
window as necessary.
If you no
longer have the overheat warning, you can drive. Just to be safe,
drive slower for about ten minutes.
If the warning doesn’t come back on,
you can drive normally.
If the warning continues, pull over, stop, and park your vehicle right away.
If there’s still
no sign of steam, push the accelerator until the engine speed is
about twice as fast as normal idle speed. Bring the engine speed back to
normal idle speed after two or three minutes. Now see if the warning stops.
But then, if you still have the warning, TURN
OFF THE ENGINE AND
GET EVERYONE OUT OF THE VEHICLE until it cools down.
You may decide not to lift the hood but to get service help right away.
5-12

Downloaded from www.Manualslib.com manuals search engine How to Add Coolant to the Coolant Recovery Tank
If you haven’t found a problem yet, but the coolant level \
isn’t at or above
the
FULL mark, add a 50/50 mixture of clean water (preferably distilled)
and
a proper antifreeze at the coolant recovery tank. (See “Engine Coolant”
in the Index for more information about the proper coolant mix.)
..
..
I NOTICE:
In cold weather, water can freeze and crack the engine, radiator,
heater core and other parts. Use the recommended coolant.
When the coolant in the coolant recovery tank is at or above the FULL,
mark, start your vehicle.
If the overheat warning continues, there’s one more thing
you can try. You
can add
the proper coolant mix directly to the radiator, but be sure the
cooling system
is cool before you do it.

Downloaded from www.Manualslib.com manuals search engine What to Use
Refer to the Maintenance Schedule to determine what kind of lubricant to
use. See “Recommended Fluids
and Lubricants” in the Index.
Engine Coolant
The following explains your cooling system and how to add coolant when it
is low. If
you have a problem with engine overheating, see “Engine
Overheating” in the Index.
The proper coolant for your vehicle will:
0 Give freezing protection down to -20°F (-29”C), or -34°F (-37°C) in
0 Give boiling protection up to 258°F (125 “C).
0 Protect against rust and corrosion.
0 Help keep the proper engine temperature.
0 Let the warning gages work as they should.
Canada
and for vehicles with the cold climate option.
What to Use
Use a mixture of one-half clean water (preferably distilled) and one-half
antifreeze
that meets “GM Specification 6038-M,” which won’t damage
aluminum parts. You can also use a recycled coolant conforming to
“GM
Specification 603%”’ with a complete coolant flush and refill. If you use
this mixture,
you don’t need to add anything else.
6-26

Downloaded from www.Manualslib.com manuals search engine I NOTICE:
If you use an improper coolant mix, your engine could overheat
and be badly damaged. The repair cost wouldn’t be covered by
your warranty. Too much water in the mix can freeze and crack
the engine, radiator, heater core and other parts.
Some conditions, such as air trapped in the cooling system, can affect the
coolant level
in the radiator. Check the coolant level when the engine is cold
and follow the steps under “Adding Coolant” for the proper way to add
coolant.
If you have to add coolant more than four times a year, have your dealer
check your cooling system.
I NOTICE:
If you use the proper coolant, you don’t have to add extra
inhibitors or additives which claim to improve the system. These
can be harmful.
Adding Coolant
To Check Coolant
When your engine is cold, the coolant level should be at COLD LEVEL, or
a little higher. When your engine is warm, the level should be up
to COLD
LEVEL, or a little higher.
6-27

Downloaded from www.Manualslib.com manuals search engine Radiator Pressure Cap
NOTICE:
Your radiator cap is a 15 psi (105 kPa) pressure-type cap and
must be tightly installed to prevent coolant
loss and possible
engine damage from overheating. Be sure the arrows on the cap \
line up with the overflow tube on the radiator filler neck.
When you replace
your radiator pressure
cap, an
AC@ cap is
recommended. See
“Service Replacement
Part and Filler
Recommendations”
in
the Index.
Thermostat
Engine coolant temperature is controlled by a thermostat in the engine
coolant system. The thermostat stops
the flow of coolant through the
radiator until the coolant reaches a preset temperature.
When you replace your thermostat, an
AC’ thermostat is recommended.
6-29

Downloaded from www.Manualslib.com manuals search engine Fuses and Circuit Breakers
The wiring circuits in your vehicle are protected from short circuits by a
combination of fuses, circuit breakers, and fusible thermal
links in the
wiring itself. This greatly reduces the chance of fires caused by electrical
problems. See “Fuses and Circuit Breakers”
in the Index for more
information.
Headlights
The headlight wiring is protected by a circuit breaker in the light switch. An
electrical overload will cause the lights
to go on and off, or in some cases to
remain off. If this happens, have your headlight wiring checked right away.
Windshield Wipers
The windshield wiper motor is protected by a circuit breaker and a fuse. If
the motor overheats
due to heavy snow, etc., the wiper will stop until the
motor cools. If the overload is caused
by some electrical problem and not
snow, etc., be sure to get it fixed.
Power Windows and Other Power Options
Circuit breakers in the fuse panel protect the power windows and other
power accessories. When the current load is too heavy, the circuit breaker
opens and closes, protecting the circuit until the problem is fixed or goes
away.
Trailer Wiring Harness
The optional seven-wire trailer wiring harness is protected by an in-line
fuse
in the battery feed wire. This fuse is near the junction block. See
“Trailer Wiring Harness”
in the Index.
6-66

Downloaded from www.Manualslib.com manuals search engine D
Damage Finish
...................................................... 6-61
Sheet Metal
.................................................. 6-60
Daytime Running Lights
..................................... 2-43. 2-60
Indicator Light
.......................................... 2-43. 2-60
Defogger. Rear Window
................... .................... 3-7
DomeLights
.................................................... 2-44
Doors
.......................................................... 2-5
Locks
........................................................ 2-8
PowerLocks
................................................. 2-10
Rear
........................................................ 2-10
Side
......................................................... 2-5
Side. Sliding
.................................................. 2-6
Sliding Tracks
................................................ 642
At Night
.................................................... 4-12
City
........................................................ 4-15
ControlOfAVehicle
........................................... 4-5
Defensive
.................................................... 4-2
Highway Hypnosis
............................................ 4-18
Hydroplaning
................................................ 4-15
InBlizzard
................................................... 4-22
In Mud. Sand. Snow. Or Ice
................................ 4-20. 5-33
InRain
...................................................... 4-13
InWater
..................................................... 4-14
LossofControl
............................................... 4-11
Nightvision
................................................. 4-13
On Hill and Mountain Roads
.................................... 4-18
On Snow or Ice
............................................... 4-20
Passing
..................................................... 4-10
Skidding
.................................................... 4-11
Stuck in Deep Snow
...................................... 4-22. 5-33
Throughwater .......................................... 2-15. 4-14
Uphill
....... .................... ................... 4-19
Winter
...................................................... 4-20
WithaTrailer
................................................ 4-23
DrunkenDriving
................................................. 4-2
Driving
E
Engine
Coolant (Block) Heater
..................................... 2.16. 3.8
Coolant
................................................ 5.14, 6.26
Coolant Temperature Gage
...................................... 2-63
Cover
....................................................... 6-15
Exhaust
................................................ 2.24. 643
FanNoise ................................................... 5-18
Identification
............................................ 6.64. 6.68
Oil (See “Oil”)
Overheating
.................................................. 5-11
RunningWhileParked
......................................... 2-24
Starting
..................................................... 2-14
Equipment. Add-on ............................................. 6-47