service CHEVROLET COBALT 2005 1.G Owner's Guide

If your vehicle is in cruise control when the Enhanced
Traction System begins to limit wheel spin, the
cruise control will automatically disengage. When road
conditions allow you to safely use it again, you may
re-engage the cruise control. SeeCruise Control
on page 3-10.
When the system is on,
this warning light will come
on to let you know
there’s a problem.
If the warning light stays on, or comes on when you’re
driving, there may be a problem with your Enhanced
Traction System and your vehicle may need service.
When this warning light is on, the system will not
limit wheel spin. Adjust your driving accordingly.
The Enhanced Traction System warning light may come
on for the following reasons:
If you turn the system off by moving the shift lever
to FIRST (1), the warning light will come on and
stay on. To turn the system back on, move the shift
lever back to a position other than FIRST (1).
The warning light should go off.
The warning light will come on when you set your
parking brake with the engine running, and it will
stay on if your parking brake does not release fully.
If the transaxle shift lever is in any position other
than FIRST (1) and the warning light stays on after
your parking brake is fully released, it means
there is a problem with the system.
If the traction control system is affected by an
engine related problem, the system will turn off and
the warning light will come on.
If the Enhanced Traction System warning light comes
on and stays on for an extended period of time when the
transaxle shift lever is in any position other than
FIRST (1), your vehicle needs service.
Limited-Slip Differential
Your vehicle may have this feature. A limited-slip
transaxle can give you additional traction on snow, mud,
ice, sand or gravel. It works like a standard transaxle
most of the time, but when one of the front wheels loses
traction, this feature will allow the wheel with traction
to move the vehicle.
4-9

Steering
Electric Power Steering
If the engine stalls while you are driving, the power
steering assist system will continue to operate until you
are able to stop your vehicle. If you lose power
steering assist because the electric power steering
system is not functioning, you can steer, but it will take
more effort.
If you turn the steering wheel in either direction several
times until it stops, or hold the steering wheel in the
stopped position for an extended amount of time, you
may notice a reduced amount of power steering
assist. The normal amount of power steering assist
should return shortly after a few normal steering
movements.
The electric power steering system does not require
regular maintenance. If you suspect steering system
problems and/or the POWER STEERING message
comes on, contact your dealer for service repairs. See
DIC Warnings and Messages on page 3-37.
Steering Tips
Driving on Curves
It is important to take curves at a reasonable speed.
A lot of the “driver lost control” accidents mentioned on
the news happen on curves. Here is why:
Experienced driver or beginner, each of us is subject to
the same laws of physics when driving on curves.
The traction of the tires against the road surface makes
it possible for the vehicle to change its path when
you turn the front wheels. If there is no traction, inertia
will keep the vehicle going in the same direction. If
you have ever tried to steer a vehicle on wet ice, you
will understand this.
The traction you can get in a curve depends on the
condition of your tires and the road surface, the angle at
which the curve is banked, and your speed. While
you are in a curve, speed is the one factor you
can control.
Suppose you are steering through a sharp curve.
Then you suddenly apply the brakes. Both control
systems — steering and braking — have to do their work
where the tires meet the road. Unless you have
four-wheel anti-lock brakes, adding the hard braking can
demand too much of those places. You can lose control.
4-10

Once you are moving on the freeway, make certain you
allow a reasonable following distance.
Expect to move slightly slower at night.
When you want to leave the freeway, move to the
proper lane well in advance. If you miss your exit, do
not, under any circumstances, stop and back up. Drive
on to the next exit.
The exit ramp can be curved, sometimes quite sharply.
The exit speed is usually posted. Reduce your speed
according to your speedometer, not to your sense
of motion. After driving for any distance at higher
speeds, you may tend to think you are going slower
than you actually are.
Before Leaving on a Long Trip
Make sure you are ready. Try to be well rested. If you
must start when you are not fresh — such as after
a day’s work — do not plan to make too many miles that
rst part of the journey. Wear comfortable clothing
and shoes you can easily drive in.Is your vehicle ready for a long trip? If you keep it
serviced and maintained, it is ready to go. If it needs
service, have it done before starting out. Of course, you
will nd experienced and able service experts in GM
dealerships all across North America. They will be ready
and willing to help if you need it.
Here are some things you can check before a trip:
Windshield Washer Fluid:Is the reservoir full? Are
all windows clean inside and outside?
Wiper Blades:Are they in good shape?
Fuel, Engine Oil, Other Fluids:Have you checked
all levels?
Lamps:Are they all working? Are the lenses clean?
Tires:They are vitally important to a safe,
trouble-free trip. Is the tread good enough for
long-distance driving? Are the tires all inated to the
recommended pressure?
Weather Forecasts:What is the weather outlook
along your route? Should you delay your trip a
short time to avoid a major storm system?
Maps:Do you have up-to-date maps?
4-22

Highway Hypnosis
Is there actually such a condition as highway hypnosis?
Or is it just plain falling asleep at the wheel? Call it
highway hypnosis, lack of awareness, or whatever.
There is something about an easy stretch of road with
the same scenery, along with the hum of the tires on the
road, the drone of the engine, and the rush of the
wind against the vehicle that can make you sleepy. Do
not let it happen to you! If it does, your vehicle can
leave the road in less than a second, and you could
crash and be injured.
What can you do about highway hypnosis? First, be
aware that it can happen.
Then here are some tips:
Make sure your vehicle is well ventilated, with a
comfortably cool interior.
Keep your eyes moving. Scan the road ahead and
to the sides. Check your rearview mirrors and your
instruments frequently.
If you get sleepy, pull off the road into a rest,
service, or parking area and take a nap, get some
exercise, or both. For safety, treat drowsiness
on the highway as an emergency.
Hill and Mountain Roads
Driving on steep hills or mountains is different from
driving in at or rolling terrain.
4-23

{CAUTION:
Things you put inside your vehicle can strike
and injure people in a sudden stop or turn, or
in a crash.
Put things in the trunk or rear area of your
vehicle. In a trunk, put them as far forward
as you can. Try to spread the weight
evenly. If you have fold-down rear seats,
you will nd four anchors on the back wall
of your trunk. You can use these anchors
to tie down lighter loads. They are not
strong enough for heavy things, however,
so put them as far forward as you can in
the trunk or rear area.
Never stack heavier things, like suitcases,
inside the vehicle so that some of them
are above the tops of the seats.
Do not leave an unsecured child restraint
in your vehicle.
When you carry something inside the
vehicle, secure it whenever you can.
Do not leave a seat folded down unless
you need to.
Towing
Towing Your Vehicle
Consult your dealer or a professional towing service if
you need to have your disabled vehicle towed. See
Roadside Assistance Program on page 7-6.
If you want to tow your vehicle behind another vehicle
for recreational purposes (such as behind a motorhome),
see “Recreational Vehicle Towing” following.
Recreational Vehicle Towing
Recreational vehicle towing means towing your vehicle
behind another vehicle — such as behind a motorhome.
The two most common types of recreational vehicle
towing are known as “dinghy towing” (towing your
vehicle with all four wheels on the ground) and “dolly
towing” (towing your vehicle with two wheels on
the ground and two wheels up on a device known
as a “dolly”).
With the proper preparation and equipment, many
vehicles can be towed in these ways. See “Dinghy
Towing” and “Dolly Towing,” following.
4-35

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.
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 are
pulling a trailer. SeeScheduled Maintenance on
page 6-4for more on this. Things that are especially
important in trailer operation are automatic transaxle
uid (do not overll), engine oil, drive belt, cooling
system and brake system.
Each of these is covered in this manual, and the Index
will help you nd them quickly. If you are trailering,
it is a good idea to review this information before you
start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Engine Cooling When Trailer Towing
Your cooling system may temporarily overheat during
severe operating conditions. SeeEngine Overheating on
page 5-29.
4-44

Service............................................................5-3
Doing Your Own Service Work.........................5-4
Adding Equipment to the Outside of Your
Vehicle......................................................5-5
Fuel................................................................5-5
Gasoline Octane............................................5-5
Gasoline Specications....................................5-6
California Fuel...............................................5-6
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-7
Filling the Tank..............................................5-8
Filling a Portable Fuel Container.....................5-10
Checking Things Under the Hood....................5-10
Hood Release..............................................5-11
Engine Compartment Overview.......................5-12
Engine Oil...................................................5-15
Engine Oil Life System..................................5-19
Engine Air Cleaner/Filter................................5-21
Automatic Transaxle Fluid..............................5-22
Manual Transaxle Fluid..................................5-22
Hydraulic Clutch...........................................5-23
Engine Coolant.............................................5-23
Coolant Surge Tank Pressure Cap..................5-29
Engine Overheating.......................................5-29
Cooling System............................................5-31
Windshield Washer Fluid................................5-35Brakes........................................................5-36
Battery........................................................5-39
Jump Starting...............................................5-40
Headlamp Aiming...........................................5-44
Bulb Replacement..........................................5-47
Halogen Bulbs..............................................5-47
Headlamps, Front Turn Signal, Sidemarker,
and Parking Lamps....................................5-48
Center High-Mounted Stoplamp (CHMSL).........5-49
Taillamps and Turn Signal Lamps (Coupe).......5-50
Taillamps, Turn Signal, Stoplamps and
Back-up Lamps.........................................5-51
Back-Up Lamps (Coupe)................................5-52
Replacement Bulbs.......................................5-53
Windshield Wiper Blade Replacement..............5-53
Tires..............................................................5-54
Tire Sidewall Labelling...................................5-56
Tire Terminology and Denitions.....................5-58
Ination - Tire Pressure.................................5-61
Tire Inspection and Rotation...........................5-63
When It Is Time for New Tires.......................5-64
Buying New Tires.........................................5-64
Uniform Tire Quality Grading..........................5-65
Wheel Alignment and Tire Balance..................5-67
Wheel Replacement......................................5-67
Tire Chains..................................................5-68
Section 5 Service and Appearance Care
5-1

If a Tire Goes Flat........................................5-69
Changing a Flat Tire.....................................5-70
Removing the Spare Tire and Tools................5-71
Removing the Flat Tire and Installing the
Spare Tire................................................5-75
Storing a Flat or Spare Tire and Tools............5-78
Compact Spare Tire......................................5-80
Appearance Care............................................5-81
Cleaning the Inside of Your Vehicle.................5-81
Fabric/Carpet...............................................5-83
Leather.......................................................5-83
Instrument Panel, Vinyl, and Other Plastic
Surfaces..................................................5-84
Care of Safety Belts......................................5-84
Weatherstrips...............................................5-84
Washing Your Vehicle...................................5-85
Cleaning Exterior Lamps/Lenses.....................5-85
Finish Care..................................................5-85
Windshield and Wiper Blades.........................5-86
Aluminum or Chrome-Plated Wheels................5-86Tires...........................................................5-87
Sheet Metal Damage.....................................5-87
Finish Damage.............................................5-87
Underbody Maintenance................................5-87
Chemical Paint Spotting.................................5-87
Vehicle Care/Appearance Materials..................5-88
Vehicle Identication......................................5-89
Vehicle Identication Number (VIN).................5-89
Service Parts Identication Label.....................5-89
Electrical System............................................5-90
Add-On Electrical Equipment..........................5-90
Headlamp Wiring..........................................5-90
Windshield Wiper Fuses................................5-90
Power Windows and Other Power Options.......5-91
Fuses and Circuit Breakers............................5-91
Floor Console Fuse Block..............................5-92
Engine Compartment Fuse Block....................5-94
Capacities and Specications..........................5-97
Section 5 Service and Appearance Care
5-2

Service
Your dealer knows your vehicle best and wants you to
be happy with it. We hope you will go to your dealer
for all your service needs. You will get genuine GM parts
and GM-trained and supported service people.
We hope you will want to keep your GM vehicle all GM.
Genuine GM parts have one of these marks:
California Proposition 65 Warning
Most motor vehicles, including this one, contain and/or
emit chemicals known to the State of California to
cause cancer and birth defects or other reproductive
harm. Engine exhaust, many parts and systems
(including some inside the vehicle), many uids, and
some component wear by-products contain and/or emit
these chemicals.
5-3

Doing Your Own Service Work
If you want to do some of your own service work, you
will want to use the proper service manual. It tells
you much more about how to service your vehicle than
this manual can. To order the proper service manual,
seeService Publications Ordering Information on
page 7-11.
Your vehicle has an airbag system. Before attempting to
do your own service work, seeServicing Your
Airbag-Equipped Vehicle on page 1-57.
You should keep a record with all parts receipts and list
the mileage and the date of any service work you
perform. SeeMaintenance Record on page 6-15.{CAUTION:
You can be injured and your vehicle could be
damaged if you try to do service work on a
vehicle without knowing enough about it.
Be sure you have sufficient knowledge,
experience, the proper replacement parts,
and tools before you attempt any vehicle
maintenance task.
Be sure to use the proper nuts, bolts, and
other fasteners. English and metric
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
5-4