engine CHEVROLET SUBURBAN 1994 Workshop Manual

I NOTICE:
Pulling a trailer improperly can damage your vehicle and result\

in costly repairs not covered
by your warranty. To pull a trailer
correctly,
follow the advice in this section, and see your GM
dealer for important information about towing a trailer with
your vehicle.
Every vehicle is ready for some trailer towing. If it was built with trailering
options, as many are, it’s ready for heavier trailers. But trailering is different
than just driving your vehicle
by itself. Trailering means changes in
handling, durability, and fuel economy. Successful, safe trailering takes
correct equipment, and
it has to be used properly.
That’s the reason for this section. In it are many time-tested, important
trailering tips and safety rules. Many of these are important for your safety
and that of your passengers.
So please read this section carefully before you
pull a trailer.
rf You Do Decide To Pull A Trailer
If you do, here are some important points.
There are many different laws having to do with trailering. Make sure
your rig will be legal, not only where you live but also where you’ll
be
driving. A good source for this information can be state or provincial
police.
Consider using a sway control with a utility model if your trailer will
weigh 3,000 pounds (1 36 1 kg) or less, or with a wagon model if your
trailer
will weigh 4,000 pounds (1 800 kg) or less. You should always
use a sway control
with a utility model if your trailer will weigh more
than
3,000 pounds (I 361 kg), or with a wagon model if your trailer
will weigh more than 4,000 pounds (1 800 kg).
You can ask
a hitch dealer about sway controls.
Don’t tow a trailer at all during the first 500 miles (800 km) your new
vehicle is driven. Your engine, axle or other parts could be damaged.
Then, during the first 500 miles (800 km) that you tow a trailer, don’t
drive over
50 mph (80 km/h) and don’t make starts at full throttle. This
helps your engine and other parts of your vehicle wear
in at the heavier
loads.
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Making Turns
When you’re turning with a trailer, make wider turns than normal. Do this
so your trailer won’t strike soft shoulders, curbs, road signs, trees, or other
objects. Avoid jerky or sudden maneuvers. Signal well
in advance.
Turn Signals When Towing a Trailer
When you tow a trailer, your vehicle has to have a different turn signal
flasher and extra wiring, The green arrows on your instrument panel will
flash whenever you signal a turn or lane change. Properly hooked up, the
trailer lights will also flash, telling other drivers you’re about to turn,
change lanes or stop.
When towing a trailer,
the green arrows on your instrument panel will flash
for turns even if the bulbs on the trailer are burned out. Thus, you may think
drivers behind you are seeing your signal when they are not. It’s important
to check occasionally
to be sure the trailer bulbs are still working.
Driving On Grades
Reduce speed and shift to a lower gear before you start down a long or
steep downgrade. If
you don’t shift down, you might have to use your
brakes
so much that they would get hot and no longer work well.
On
a long uphill grade, shift down and reduce your speed to around 45 mph
(70 kdh) to reduce the possibility of engine and transmission overheating.
If you have an automatic transmission, you should use “D” (or, as you need
to, a lower gear) when towing
a trailer. Operating your vehicle in “D” when
towing a trailer will minimize heat buildup and extend
the life of your
transmission.
If
you have a manual transmission and you are towing a trailer, it’s better
not
to use fifth gear. Just drive in fourth gear (or, as you need to, a lower
gear).
Parking on Hills
You really should not park your vehicle, with a trailer attached, on a hill. If
something goes wrong, your rig could start to move. People can be injured,
and both your vehicle and the trailer can be damaged.
But
if you ever have to park your rig on a hill, here’s how to do it:
1. Apply your regular brakes, but don’t shift into “P’ (Park) yet, or in gear
for a manual transmission.
2. Have someone place chocks under the trailer wheels.
3. When the wheel chocks are in place, release the regular brakes until the
chocks absorb
the load.
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4. Re-apply the regular brakes. Then apply your parking brake, and then
shift to
“P” (Park), or “R’ (Reverse) for a manual transmission.
5. If you have a four-wheel-drive vehicle, be sure the transfer case is in a
6. Release the regular brakes. drive
gear-not in “N” (Neutral).
When You Are Ready to Leave After Parking on a Hill
1. Apply your regular brakes and hold the pedal down while you:
Start your engine;
Shift into a gear; and
Release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the chocks.
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Maintenance When Trailer Towing
Your vehicle will need service more often when you’re pulling a trailer. See
the Maintenance Schedule for more on this. Things that are especially
important in trailer operation are automatic transmission fluid (don’t
overfill), engine oil, axle lubricant, belt, cooling system, and brake
adjustment. Each
of these is covered in this manual, and the Index will help
you find them quickly. If you’re trailering, it’s a good idea to review these
sections before you start your trip.
Check periodically to see
that all hitch nuts and bolts are tight.
Trailer Light Wiring
See “Trailer Wiring Harness” in the Index.
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Problems On The Road
Section
.
.
Here you’ll find what to do about some problems that can occur on the road .
Hazard Warning Flasher ..................................... 5-2
Other Warning Devices .................................... 5-3
Jumpstarting .............................................. 5-3
TowingYourVehicle ........................................ 5-7
Engine Overheating ...................................... 5-10
Engine Fan Noise ...................... ................ 5-24
If a Tire Goes Flat ......................................... 5-24
Changing a Flat Tire ..................................... 5-25
SpareTire ............................................. 5-26
Jackstorage ........................................... 5-26
If You’re Stuck: In Sand. Mud. Ice or Snow ..................... 5-40
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Tu Jump Start Your Vehicle;
1. Check the other vehicle. It must have a 12-volt battery with a negative
ground system.
I NOTICE:
I
If the other system isn’t a 12-volt system with a negative
ground, both vehicles can be damaged.
If you have a diesel engine vehicle with two batteries (or more), you
should know before you begin that, especially in cold weather, you may
not be able to get enough power from a single battery in another
vehicle to start your diesel engine.
If your vehicle has more than one battery, use the battery that’s on the
passenger side
of the vehicle - this will reduce electrical resistance.
2. Get the vehicles close enough so the jumper cables can reach, but be
sure the vehicle’s aren’t touching each other.
If they are, it could cause
a ground connection
you don’t want. You wouldn’t be able to start your
vehicle, and the bad grounding could damage the electrical systems.
You could be injured if
the vehicles roll. Set the parking brake firmly
on each vehicle. Put an automatic transmission in “P’ (Park) or a
manual transmission in “N’ (Neutral). If you have a four-wheel-drive
vehicle, be sure the transfer case is not in “N” (Neutral).
3. Turn off the ignition on both vehicles. Turn off all lights that aren’t
needed, and radios. This will avoid sparks and help save both batteries.
And it could save your radio!
NOTICE:
If you leave your radio on, it could be badly damaged. The
repairs wouldn’t
be covered by your warranty.
4. Open the hoods and locate the batteries. Find the positive (+) and
negative
(-) terminals on each battery.
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5. Check that the jumper cables don’t have loose or missing insulation. If
they do, you could get a shock. The vehicles could be damaged, too.
Before you connect the cables, here are some basic things you should
know. Positive
(+) will go to positive (+) and negative (-) will go to
negative (-) or a metal engine part. Don’t connect (+) to (-) or you’ll
get a short that would damage the battery and maybe other parts, too.
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6. Connect the red positive (+) cable to the positive (+) terminal of the
vehicle with the dead battery. Use a remote positive (+> terminal if the
vehicle
has one.
Dead Battery (+) Good Battery (+)
b
7. Don't let the other end touch metal. Connect it to the positive (+)
terminal of the good battery. Use a remote positive (+) terminal if the
vehicle has one.
8. Now connect the black negative (-) cable to the good battery's negative
(-) cable.
Don't let
the other end touch anything until the next step. The other end
of the negative cable doesn't go to the dead battery. It goes to a heavy
unpainted metal
part of the vehicle with the dead battery.
Good Battery (-) Heavy Metal Engine Part
.: . .
I
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9. Attach the cable at least 18 inches (45 cm) away from the dead battery,
but not near engine parts that move. The electrical connection
is just as
good there, but the chance of sparks getting back to the battery is much
less.
10. Now start the vehicle with the good battery and run the engine for
awhile.
1 1. Try to start the vehicle with the dead battery.
If it won't start after a few tries, it probably needs service.
Remove Cables in this Order
1. Heavy Metal
Engine Part
2. Good Battery (-)
3. Good Battery (+)
4. Dead Battery (+)
12. Remove the cables in reverse order to prevent electrical shorting.
Take care that they don't touch each other
or any other metal.
Towing Your Vehicle
Try to have your GM dealer or a professional towing service tow your
vehicle. They can provide the right equipment and know how
to tow it
without damage.
If your vehicle has been changed since
it was factory-new, by adding such
things like fog lamps, aero skirting, or special tires and wheels, these things
could
be damaged during towing.
Before
you do anything, turn on the hazard warning flashers.
When you call,
tell the towing service:
That your vehicle has rear-wheel drive, or that it has the four-wheel
drive option.
The make, model, and year of your vehicle.
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Towing From the Rear
Engine Overheating
You will find a coolant temperature gage on your vehicle instrument panel.
If you have a diesel engine, you will also find a low coolant light on your
instrument panel.
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