engine GMC SAVANA 1996 Service Manual

Driving On Grades
Reduce speed and shift to a:lower gear before you start
down a long or steep doyngrade. 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 km/h) to reduce the
possibility
of engine and transmission overheating.
When towing at high altitude on steep uphill grades,
consider the following: Engine coolant will boil at a
lower temperature than
at normal altitudes. If you turn
your engine
off immediately after towing at high altitude
on steep uphill grades,
your vehicle may show signs
similar to engine overheating.
To avoid this, let the
engine run while parked (preferably on level ground)
with the automatic transmission in PARK
(P) for a few
minutes before turning the engine off.. If
you do get the
overheat warning, see “Engine Overheating” in the Index.
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
PARK
(P) yet. Then turn your wheels into the curb
if facing downhill or into traffic if facing ,uphill.
2. Have someone place chocks under the trailer wheels. I
3. When the wheel chocks are in place, release the
regular brakes until the chocks absorb the load.
4. Re-apply the regular brakes. Then apply your
parking brake and then shift to
PARK (P).
5. Release the regular brakes.
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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.
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 Wiring Harness
The eight-wire harness, if you have one, is stored under
your vehicle along the rear frame crossmember.
It is
wrapped and bound with a plastic strap. The harness has
a 30-anlp battery feed and no connector, and you should
have a qualified electrical service person wire your
harness for you. Attach the harness
to the trailer, then
tape or strap
it to your vehicle’s frame rail. Be sure you
leave
it loose enough so the wiring doesn’t bend or
break, but not
so loose that it drags on the ground.
Store the harness
in its original place. Wrap the harness
together and tie
it neatly so it won’t be damaged.
The five-wire harness,
if you have one, is stored inside
the vehicle at the passenger side rear corner, behind the
jack. This should be wired by a qualified electrical
service person. It must be routed out
of your vehicle
between the rear door and the floor,
with enough of the
harness left on both sides
so that the trailer or the body
won’t pull
it.
Store the harness in its original place. Wrap the harness
together and tie
it neatly so it won’t be damaged.
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To turn off the flashers, push the button until the first
‘click and release.
When the hazard warning flashers are on, your turn
signals- won’t work.
1 ’ Other Warning Devices
U? you carry reflective triangles, you can use them to
warn others. Set one up at the side of the road about
300 feet (100 m) behind your vehicle.
Jump Starting
If your battery has run down, you may want to use another
vehicle and some jumper cables to
start your vehicle. But
please use the following steps listed to
do it safely.
Batteries can hurt you. They can be
dangerous because:
0 They contain acid that can burn you.
0 They contain gas that can explode or ignite.
0 They contain enough electricity to burn you.
If you don’t follow these steps exa’ctly, some or all
of these things can hurt you.
i
NOTICE:
1. Check the other vehicle. It must have a 12-volt
battery with a negative ground system.
Ignoring these steps could result in costly damage
to your vehicle that wouldn’t be covered by
your warranty.
Trying to start your vehicle by pushing or pulling
it won’t work, and it could damage your vehicle.
NOTICE:
I
I
If’the other system isn’t a 12-volt system with a
negative ground, both vehicles can be damaged.
I
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.
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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 positive (+) to
negative (-) or you will get a short that would
darr ;e t‘ battery and maybe other parts, too.
A .CAUTION: I
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving parts
once the engines are running. 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.
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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. Now
connect the black
negative
(-) cable to
the good battery‘s negative
(-) terminal.
Don’t let the other end touch anything
until the
next step.
9. Make your last connection away from the battery,
to the engine block, frame or other metal parts of
your vehicle.
10. Now start the vehicle with the good battery and run
the engine for
a while.
1 I. Try to start the vehicle with the dead battery.
If it won’t start after a few tries, it probably
needs service.
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12. Remove the cables in reverse order to prevent
electrical shorting. Take care
that they don’t touch
each other or any other metal.
A
A. Engine Block, Frame, Heavy Metal Engine Part
B. Good Battery
C. Dead Battery
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. See
“Roadside Assistance” in your Index.
If your vehicle has been changed since it was
factory-new, by adding 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:
0
0
0
0
That your vehicle has rear wheel drive.
The make, model and year of your vehicle.
Whether you can move the shift lever for
the transmission.
If there was an accident, what was damaged.
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Engine Overheating (Gasoline Engine)
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.
If your vehicle has a diesel engine, see “Engine
Overheating”
in the GM Diesel Engine Supplement.
If Steam Is Coming From Your Engine
1
A CAUTION: &3p h;1 -:.e
Steam from an overheated engine can burn you
badly, even if you just open the hood. Stay
away
from the engine if you see or hear steam coming
from it. Just turn it off and get everyone
away
from the vehicle until it cools down. Wait until
there is no sign
of steam or coolant before
opening the hood.
If you keep driving when your engine is
overheated, the liquids in it can catch fire. You or
others could be badly burned. Stop your engine if
it overheats, and get out
of the vehicle until the
engine is cool.
I NOTICE: I
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.
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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.
Stop after high-speed driving.
Idle for long periods in traffic.
Tow a trailer. See “Driving on Grades’’ in the Index.
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 window as necessary.
3. If you’re in a traffic jam, shift to NEUTRAL (N);
otherwise, shift to the highest gear while
driving
-- DRIVE (D).
If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about
10 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, you can idle the engine
for two or three minutes while you’re parked, to 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,
tLtrn off the engine atzd get everyone out ofthe
vehicle until it cools down.
You may decide not
to lift the hood but to get service
help right away.
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’
Cooling System
When you decide it’s safe to lift the hood, here’s what
you’ll see:
A. Radiator Pressure Cap
B. Coolant Recovery Tank
C. Engine Fan(s)
If the coolant inside the coolant recovery tank is boiling,
don’t
do anything else until it cools down.
The coolant level should
be at or above the FULL
COLD mark.
If it isn’t, you may have a leak in the
radiator hoses, heater hoses, radiator, water pump or
somewhere else in the cooling system.
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A CAUTIO1 . .
Heater and radiator hoses, and other engine
parts, can be very hot. Don’t touch them. If you
do,
you can be burned.
Don’t run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine fire, and you could be burned.
Get any leak fixed before you drive the vehicle.
I NOTICE:
Engine damage from running your engine
without coolant isn’t covered by your warranty.
~~ ~ ~
If there seems to be no leak, start the engine again. See
if the fan speed increases when idle speed is doubled by
pushing
the accelerator pedal down. If it doesn’t, your
vehicle needs service. Turn
off the 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 the
FULL COLD mark, add a 50150 mixture of
clean water (preferably distilled) and DEX-COOL
(orange-colored, silicate-free) antifreeze at the coolant
recovery tank. (See “Engine Coolant”
in the Index for
more information.)
Adding only plain water
to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle’s coolant warning
system is set for the proper coolant mix. With
plain water or the wrong mix, your engine could
get too hot but you wouldn’t get the overheat
warning. Your engine could catch fire and you or
others could be burned. Use
a 50/50 mix of clean
water and DEX-COOL
TM antifreeze.
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