2006 CADILLAC CTS cooling

Trunk
{CAUTION:
It can be dangerous to drive with the trunk lid
open because carbon monoxide (CO) gas can
come into your vehicle. You cannot see or
smell CO. It can cause unconsciousness and
even death. If you must drive with the trunk lid
open or if electrical wiring or other cable
connections must pass through the seal
between the body and the trunk lid:
Make sure all other windows are shut.
Turn the fan on your heating or cooling
system to its highest speed and select the
control setting that will force outside air
into your vehicle. See Climate Control
System.
If you have air outlets on or under the
instrument panel, open them all the way.
SeeEngine Exhaust on page 2-37.
Trunk Lock Release
The remote trunk release
button is located on the
lower portion of the
driver’s door.
To use the remote trunk release, the shift lever must be
in PARK (P) or NEUTRAL (N) for a vehicle with an
automatic transmission. The shift lever must be
in NEUTRAL, with the parking brake set for a vehicle
with a manual transmission.
Press the button to open the trunk. You can also press
the button with the trunk symbol on the Remote
Keyless Entry (RKE) transmitter to open the trunk.
If your vehicle is ever without power, you can still access
the trunk area. Use one of the following procedures to
manually open the trunk.
2-12

Cigarette Lighter
The cigarette lighter is located next to the ashtray.
The vehicle does not have a cigarette lighter for the
rear seat passengers.
Notice:Holding a cigarette lighter in while it is
heating will not allow the lighter to back away from
the heating element when it is hot. Damage from
overheating may occur to the lighter or heating
element, or a fuse could be blown. Do not hold a
cigarette lighter in while it is heating.
SeeAccessory Power Outlet(s) on page 3-21for more
information.
To use the lighter, press the lighter all the way in and
release it. It will pop back out by itself once the element
has heated for use.
Climate Controls
Dual Climate Control System
With this system you can control the heating, cooling
and ventilation for your vehicle.
Uplevel Version Shown, Base Similar
3-23

If the TC warning light stays on or comes on while you
are driving, pull off the road as soon as possible
and stop carefully. Try resetting the system by turning
the ignition off then back on. If the light still stays
on or comes back on again while you are driving, your
vehicle needs service. Have the Traction Control
System (TCS) inspected as soon as possible. See
Traction Control System (TCS) (CTS) on page 4-9or
Traction Control System (TCS) (CTS-V) on page 4-10
for more information.
Engine Coolant Temperature
Warning Light (CTS)
This light will come on
when you rst start the
vehicle as a check
to let you know that the
light is working.
It will go out after a few seconds. If the light does not
come on, see your dealer.If the light does not go out or if the light comes on and
stays on while you are driving, your vehicle may
have a problem with the cooling system. You should
stop the vehicle and turn off the engine as soon
as possible to avoid damage to the engine. A warning
chime will also sound when this light is on.
SeeEngine Overheating on page 5-28for more
information.
Engine Coolant Temperature Gage
This gage shows the
engine coolant
temperature. If the gage
pointer moves into
the shaded area, the
engine is too hot.
That reading means the same thing as the warning
light – the engine coolant is very hot. SeeEngine
Overheating on page 5-28.
3-40

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 GM dealer.
SeeEngine Oil on page 5-16andScheduled
Maintenance on page 6-4for 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 5-20. 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. See
Scheduled Maintenance on page 6-4and
Recommended Fluids and Lubricants on page 6-13for
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 5-23.
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 GM dealer as
soon as possible. SeeBrake System Warning Light
on page 3-38andBrakes on page 5-38for more
information.
Check Coolant Level
Notice:If your engine catches re because you
keep driving with no coolant, your vehicle can
be badly damaged. The costly repairs would not be
covered by your warranty. SeeOverheated Engine
Protection Operating Mode on page 5-30for
information on driving to a safe place in an
emergency.
This message will appear when there is a low level of
engine coolant. Have the cooling system serviced
by your GM dealer as soon as possible. SeeEngine
Coolant on page 5-26for 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 3-41for more information.
3-63

If you drive regularly in steep country, or if you are
planning to visit there, here are some tips that can
make your trips safer and more enjoyable.
Keep your vehicle in good shape. Check all uid
levels and also the brakes, tires, cooling system,
and transmission. These parts can work hard
on mountain roads.
{CAUTION:
If you do not shift down, your brakes could get
so hot that they would not work well. You would
then have poor braking or even none going
down a hill. You could crash. Shift down to let
your engine assist your brakes on a steep
downhill slope.
{CAUTION:
Coasting downhill in NEUTRAL (N) or with
the ignition off is dangerous. Your brakes
will have to do all the work of slowing down.
CAUTION: (Continued)
CAUTION: (Continued)
They could get so hot that they would not
work well. You would then have poor braking
or even none going down a hill. You could
crash. Always have your engine running and
your vehicle in gear when you go downhill.
Know how to go down hills. The most important
thing to know is this: let your engine do some of
the slowing down. Shift to a lower gear when you go
down a steep or long hill.
Know how to go uphill. You may want to shift down to
a lower gear. The lower gears help cool your engine
and transmission, and you can climb the hill better.
Stay in your own lane when driving on two-lane
roads in hills or mountains. Do not swing wide or cut
across the center of the road. Drive at speeds that let
you stay in your own lane.
As you go over the top of a hill, be alert. There could
be something in your lane, like a stalled car or an
accident.
You may see highway signs on mountains that warn
of special problems. Examples are long grades,
passing or no-passing zones, a falling rocks area,
or winding roads. Be alert to these and take
appropriate action.
4-26

Service............................................................5-3
Accessories and Modications..........................5-3
California Proposition 65 Warning.....................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...................................................5-16
Engine Oil Life System..................................5-20
Engine Air Cleaner/Filter................................5-21
Automatic Transmission Fluid.........................5-23
Manual Transmission Fluid.............................5-24
Hydraulic Clutch...........................................5-25
Engine Coolant.............................................5-26
Coolant Surge Tank Pressure Cap..................5-28
Engine Overheating.......................................5-28Overheated Engine Protection
Operating Mode........................................5-30
Cooling System............................................5-31
Power Steering Fluid.....................................5-36
Windshield Washer Fluid................................5-37
Brakes........................................................5-38
Battery........................................................5-41
Jump Starting...............................................5-42
Rear Axle.......................................................5-48
Headlamp Aiming...........................................5-49
Bulb Replacement..........................................5-52
High Intensity Discharge (HID) Lighting............5-52
Halogen Bulbs..............................................5-52
Front Turn Signal and Fog Lamps...................5-53
Taillamps, Turn Signal, Stoplamps and
Sidemarker Lamps.....................................5-53
Back-Up and License Plate Lamps..................5-54
Replacement Bulbs.......................................5-55
Windshield Wiper Blade Replacement..............5-55
Tires..............................................................5-57
Tire Sidewall Labeling...................................5-58
Tire Terminology and Denitions.....................5-61
Run-Flat Tires (CTS-V)..................................5-64
Ination - Tire Pressure.................................5-65
Tire Pressure Monitor System.........................5-68
Section 5 Service and Appearance Care
5-1

A. Underhood Fuse Block. SeeUnderhood Fuse
Block on page 5-105.
B. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-37.
C. Battery. SeeBattery on page 5-41.
D. Passenger Compartment Air Filter. SeePassenger
Compartment Air Filter on page 3-29.
E. Power Steering Fluid Reservoir (Under Engine
Cover). SeePower Steering Fluid on page 5-36.
F. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil on page 5-16.G. Engine Oil Dipstick (Out of View). See “Checking
Engine Oil” underEngine Oil on page 5-16.
H. Brake Master Cylinder Reservoir. See “Brake Fluid”
underBrakes on page 5-38.
I. Hydraulic Clutch Reservoir (If Equipped)
(Not Shown). See “When to Check and What to
Use” underHydraulic Clutch on page 5-25.
J. Engine Coolant Surge Tank and Pressure Cap.
SeeCoolant Surge Tank Pressure Cap on
page 5-28andCooling System on page 5-31.
K. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
5-13

A. Underhood Fuse Block. SeeUnderhood Fuse
Block on page 5-105.
B. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-37.
C. Battery. SeeBattery on page 5-41.
D. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil on page 5-16.
E. Passenger Compartment Air Filter. SeePassenger
Compartment Air Filter on page 3-29.
F. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil on page 5-16.G. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-36.
H. Brake Master Cylinder Reservoir. See “Brake Fluid”
underBrakes on page 5-38.
I. Hydraulic Clutch Reservoir. See “When to Check
and What to Use” underHydraulic Clutch on
page 5-25.
J. Engine Coolant Surge Tank and Pressure Cap.
SeeCoolant Surge Tank Pressure Cap on
page 5-28andCooling System on page 5-31.
K. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
5-15