maintenance CADILLAC CTS 2007 1.G User Guide

Change Engine Oil
This message indicates that the life of the engine
oil has expired and it should be changed and
that your vehicle is due for service. See your
dealer. SeeEngine Oil on page 346and
Scheduled Maintenance on page 462for more
information.
When you reset the Change Engine Oil message
by clearing it from the display, you still must
reset the engine oil life system separately. For
more information on resetting the engine oil
life system, seeEngine Oil Life System on
page 349. If you clear this message from the
display, it will not re-appear.
Change Trans (Transmission) Fluid
(Automatic Transmission)
This message indicates that the life of the
transmission uid has expired and it should be
changed. SeeScheduled Maintenance on
page 462andRecommended Fluids and
Lubricants on page 473for the proper uid and
change intervals.When you reset the Change Trans Fluid message
by clearing it from the display, you still must
reset the transmission uid life monitor separately.
For more information on resetting the transmission
uid life monitor, seeAutomatic Transmission
Fluid on page 353.
Check Brake Fluid
This message will display if the ignition is in ON to
inform the driver that the brake uid level is low.
Have the brake system serviced by your dealer as
soon as possible. SeeBrake System Warning
Light on page 205andBrakes on page 371
for more information.
Check Gas Cap
When this message appears on the display, the
gas cap has not been fully tightened. You
should recheck the gas cap to ensure that it is on
and tightened properly. See “If the Light Is On
Steady” underMalfunction Indicator Lamp
on page 209for more information.
235

Sheet Metal Damage................................. 442
Finish Damage.......................................... 442
Underbody Maintenance............................ 443
Chemical Paint Spotting............................ 443
Vehicle Care/Appearance Materials............ 444
Vehicle Identication.................................. 445
Vehicle Identication Number (VIN)........... 445
Service Parts Identication Label............... 445Electrical System........................................ 446
Add-On Electrical Equipment..................... 446
Windshield Wiper Fuses............................ 446
Power Windows and Other Power
Options.................................................. 446
Fuses and Circuit Breakers....................... 447
Underhood Fuse Block.............................. 447
Rear Underseat Fuse Block....................... 451
Capacities and Specications.................... 457
Section 5 Service and Appearance Care
331

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.
Doing Your Own Service Work
{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.
CAUTION: (Continued)
CAUTION: (Continued)

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.
If you want to do some of your own service work,
you should 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 501.
Your vehicle has an airbag system. Before
attempting to do your own service work, see
Servicing Your Airbag-Equipped Vehicle on
page 88.
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 477.
333

Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your
vehicle can affect the airow around it. This may
cause wind noise and affect windshield washer
performance. Check with your dealer before
adding equipment to the outside of your vehicle.
Fuel
Use of the recommended fuel is an important part
of the proper maintenance of your vehicle. To
help keep the engine clean and maintain optimum
vehicle performance, GM recommends the use
of gasoline advertised as TOP TIER Detergent
Gasoline.
The 8th digit of the Vehicle Identication Number
(VIN) shows the code letter or number that
identies your vehicle’s engine. The VIN is at the
top left of the instrument panel. SeeVehicle
Identication Number (VIN) on page 445.
Gasoline Octane
If your vehicle has the 2.8L V6 engine (VIN
Code T), use regular unleaded gasoline with a
posted octane rating of 87 or higher. If the octane
rating is less than 87, you may notice an audible
knocking noise when you drive, commonly referred
to as spark knock. If this occurs, use a gasoline
rated at 87 octane or higher as soon as possible.
If you are using gasoline rated at 87 octane or
higher and you hear heavy knocking, your engine
needs service.
If your vehicle has the 3.6L V6 engine (VIN
Code 7), use regular unleaded gasoline with a
posted octane rating of 87 or higher. For best
performance or trailer towing, you may choose to
use middle grade 89 octane unleaded gasoline.
If the octane rating is less than 87, you may notice
an audible knocking noise when you drive,
commonly referred to as spark knock. If this occurs,
use a gasoline rated at 87 octane or higher as soon
as possible. If you are using gasoline rated at
87 octane or higher and you hear heavy knocking,
your engine needs service.
334

When to Inspect the Engine Air
Cleaner/Filter
Inspect the air cleaner/lter at the MaintenanceII
intervals and replace it at the rst oil change
after each 50,000 mile (83 000 km) interval. See
Scheduled Maintenance on page 462for more
information. If you are driving in dusty/dirty
conditions, inspect the lter at each engine oil
change.
How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/lter, remove the lter
from the vehicle and lightly shake the lter to
release loose dust and dirt. If the lter remains
caked with dirt, a new lter is required.
To inspect or replace the engine air cleaner/lter,
do the following:
1. Remove the two screws located on the sides
of the cover.
2. Lift the cover off.3. Inspect or replace the engine air cleaner/lter.
SeeNormal Maintenance Replacement Parts
on page 475for the correct part number
for the lter.
4. Reinstall the cover by reversing Steps 1 and 2.
{CAUTION:
Operating the engine with the air
cleaner/lter off can cause you or others
to be burned. The air cleaner not only
cleans the air; it helps to stop ames if
the engine backres. If it is not there and
the engine backres, you could be
burned. Do not drive with it off, and be
careful working on the engine with the air
cleaner/lter off.
Notice:If the air cleaner/lter is off, a backre
can cause a damaging engine re. And, dirt
can easily get into your engine, which will
damage it. Always have the air cleaner/lter in
place when you are driving.
352

Hydraulic Clutch
It is not necessary to regularly check clutch uid
unless you suspect there is a leak in the system.
Adding uid will not correct a leak.
A uid loss in this system could indicate a
problem. Have the system inspected and repaired.
When to Check and What to Use
The hydraulic clutch
uid reservoir cap has
this symbol on it.
SeeEngine
Compartment Overview
on page 342for
reservoir location.
Refer to the Maintenance Schedule to determine
how often you should check the uid level in
your clutch master cylinder reservoir and for the
proper uid to use. SeeOwner Checks and
Services on page 469andRecommended Fluids
and Lubricants on page 473.
How to Check and Add Fluid
Make sure the uid level is at the MIN (Minimum)
line on the side of the reservoir. If it is not,
remove the cap and add the proper uid until the
level reaches the MIN line.
Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is
designed to remain in your vehicle for ve years or
150,000 miles (240 000 km), whichever occurs
rst, if you add only DEX-COOL
®extended
life coolant.
The following explains your cooling system and
how to add coolant when it is low. If you have
a problem with engine overheating, seeEngine
Overheating on page 360.
356

A 50/50 mixture of clean, drinkable water and
DEX-COOL®coolant will:
Give freezing protection down to
−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Allow the warning lights and gages to work as
they should.
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 the
rst maintenance service after each
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.
What to Use
Use a mixture of one-half clean, drinkable water
and one-half DEX-COOL®coolant which will
not damage aluminum parts. If you use this coolant
mixture, you do not need to add anything else.
{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:If you use an improper coolant
mixture, your engine could overheat and be
badly damaged. The repair cost would not be
covered by your warranty. Too much water
in the mixture can freeze and crack the engine,
radiator, heater core, and other parts.
357

What to Add
When you do need brake uid, DOT-3 brake uid
is recommended for use. DOT-4 brake uid is
also compatible with your vehicle’s brake system
parts. However, if you choose to use DOT-4
uid, it is recommended that you ush your brake
hydraulic system and rell it with new DOT-4
uid at a regular maintenance service every
two years. SeeAdditional Required Services on
page 465. Use new brake uid from a sealed
container only. SeeRecommended Fluids
and Lubricants on page 473.
Always clean the brake uid reservoir cap and the
area around the cap before removing it. This
will help keep dirt from entering the reservoir.{CAUTION:
With the wrong kind of uid in the brake
system, the brakes may not work well.
This could cause a crash. Always use the
proper brake uid.
Notice:
Using the wrong uid can badly damage
brake system parts. For example, just a
few drops of mineral-based oil, such
as engine oil, in the brake system can
damage brake system parts so badly that
they will have to be replaced. Do not
let someone put in the wrong kind of uid.
If you spill brake uid on your vehicle’s
painted surfaces, the paint nish can
be damaged. Be careful not to spill brake
uid on your vehicle. If you do, wash it
off immediately. SeeWashing Your Vehicle
on page 439.
372

Battery
Your vehicle has a maintenance free battery.
When it is time for a new battery, get one that has
the replacement number shown on the original
battery’s label. We recommend an ACDelco
®
replacement battery. SeeEngine Compartment
Overview on page 342for battery location.
Warning:Battery posts, terminals, and related
accessories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive harm. Wash
hands after handling.
{CAUTION:
Batteries have acid that can burn you and
gas that can explode. You can be badly
hurt if you are not careful. SeeJump
Starting on page 376for tips on working
around a battery without getting hurt.
After a power loss, such as disconnecting the
battery or removing the maxi fuses in the power
distribution fuse block, the following steps must be
performed to calibrate the electronic throttle control.
If this is not done, the engine will not run properly.
1. Turn the ignition key to ON. Do not start the
engine.
2. Leave the ignition in ON for at least
three minutes so that the electronic throttle
control will cycle and re-learn its home
position.
3. Turn the ignition to OFF.
4. Start and run the engine for at least
30 seconds.
375

Rear Axle
When to Check Lubricant
It is not necessary to regularly check rear axle
uid unless you suspect there is a leak or you hear
an unusual noise. A uid loss could indicate a
problem. Have it inspected and repaired.
How to Check Lubricant
To get an accurate reading, the vehicle should be
on a level surface.If the level is below the bottom of the ller plug
hole, located on the rear axle, you’ll need to add
some lubricant. Add enough lubricant to raise
the level to the bottom of the ller plug hole.
What to Use
Refer to the Maintenance Schedule to determine
what kind of lubricant to use. SeeRecommended
Fluids and Lubricants on page 473.
382