overheating CADILLAC STS 2009 1.G Owners Manual

use equipment exceeding maximum amperage
rating of 20 amperes. Check with your dealer/retailer
before adding electrical equipment.
Follow the proper installation instructions that are
included with any electrical equipment you install.
Notice:Improper use of the power outlet can cause
damage not covered by the warranty. Do not hang
any type of accessory or accessory bracket from
the plug because the power outlets are designed
for accessory power plugs only.
Ashtray(s) and Cigarette Lighter
The vehicle may have an ashtray and cigarette lighter.
Notice:If papers, pins, or other ammable items
are put in the ashtray, hot cigarettes or other
smoking materials could ignite them and possibly
damage the vehicle. Never put ammable items
in the ashtray.
Ashtray
For vehicles with an ashtray, it is located under the
climate control panel on the center console. Press on the
door to release the ashtray. The ashtray automatically
slides open for use.To empty the ashtray with the ashtray in full open
position, locate the release button to the right of the ash
receiver and slide it to the right (in the direction of the
arrow). The ash receiver will unlock and lift slightly and
can then be easily removed from the housing. To replace
the ash receiver, place it into position in the ashtray
housing and push down rmly until it locks into place.
Cigarette Lighter
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. Do not use
equipment exceeding maximum amperage rating
of 15 amperes.
The cigarette lighter is located next to the ashtray.
The vehicle does not have any cigarette lighters for
the rear seat passengers.
To activate the cigarette lighter, push it into the heating
element and let go. When the lighter is ready it will
pop back out by itself.
3-47

Lane Departure Warning Light
For vehicles with the lane
departure warning system,
this light briey comes
on green, while starting
the vehicle, to indicate
that it is working.
If it does not, have the vehicle serviced by your
dealer/retailer. If the system is working normally the
indicator light will then go off.
This light also comes on green if the system detects a
left or right lane marking. It ashes, changes to amber
and three beeps sound if a detected lane marking is
crossed without using a turn signal. For more information,
see the Index in the Navigation Manual.
Engine Coolant Temperature
Warning Light
The engine coolant
temperature warning
light comes on when
the engine is very hot.
This light also comes on briey when the vehicle is
started.
If the light does not go out or comes on and stays on
while driving, there may be a problem with the cooling
system. Driving with engine coolant temperature light on
could cause the vehicle to overheat, seeOverheated
Engine Protection Operating Mode on page 5-36.
SeeEngine Overheating on page 5-34andDIC
Warnings and Messages on page 3-79for more
information.
3-64

Engine Coolant Temperature Gage
This gage shows
the engine coolant
temperature.
It can be used to see when the engine has warmed
up and to make sure the cooling system is operating
properly. If the gage pointer moves into the shaded area,
the engine coolant is too hot and the engine coolant
temperature warning light comes on. SeeEngine
Overheating on page 5-34for more information.
Tire Pressure Light
For vehicles with a tire
pressure light, this light
comes on briey when
the engine is started and
provides information about
tire pressures and the Tire
Pressure Monitoring
System.
When the Light is On Steady
This indicates that one or more of the tires is signicantly
underinated.
A tire pressure message in the Driver Information
Center (DIC), can accompany the light. SeeDIC
Warnings and Messages on page 3-79for more
information. Stop and check the tires as soon as it is
safe to do so. If a tire is underinated, inate to the
proper pressure. SeeTires on page 5-54for more
information.
3-65

COMPETITIVE DRIVING (STS-V Only)
This message displays when the competitive driving
mode is turned on with the TC (traction control) button.
The TC (traction control) light comes on when the
competitive driving mode is on. The Traction Control
System (TCS) will not operate while in competitive
driving mode. Adjust your driving accordingly. See
Competitive Driving Mode on page 4-11for more
information.
DRIVER DOOR AJAR
This symbol appears with
this message.
This message displays when the driver door is not
closed completely. Make sure that the door is closed
completely.
ENGINE COOLANT HOT IDLE ENGINE
Notice:If you drive your vehicle while the engine
is overheating, severe engine damage may occur.
If an overheat warning appears on the instrument
panel cluster and/or DIC, stop the vehicle as soon as
possible. Do not increase the engine speed above
normal idling speed. SeeEngine Overheating
on page 5-34for more information.
This symbol appears with
this message.
This message displays when the engine coolant
temperature is too hot. Stop and allow the vehicle
to idle until it cools down. SeeEngine Coolant
Temperature Warning Light on page 3-64.
SeeOverheated Engine Protection Operating Mode on
page 5-36for information on driving to a safe place
in an emergency.
3-83

ENGINE PROTECTION REDUCED
RPM’S (Revolutions Per Minute)
This message displays when your vehicle is in an
overheated engine operating mode. If this message
appears, the vehicle has determined that continued
operation at the existing engine speed may lead to
engine overheating. The vehicle automatically limits
engine RPMs to prevent engine overheating. You may
notice the vehicle upshifting early or reduced speeds
while this message is displayed. When the engine oil
returns to a safe operating temperature, this message
clears from the DIC and the vehicle returns to normal
operation. Your vehicle does not require service when
this message is displayed.
FUEL LEVEL LOW
This symbol appears with
this message.
This message displays and a chime sounds if the fuel
level is low. Refuel as soon as possible. SeeFuel Gage
on page 3-71andFuel on page 5-5for more information.
HOOD AJAR
This symbol appears with
this message.
This message displays when the hood is not closed
completely. Make sure that the hood is closed
completely. SeeHood Release on page 5-11.
ICE POSSIBLE
This message displays when the outside temperature
is cold enough to create icy road conditions. Adjust your
driving accordingly.
KEY FOB BATTERY LOW
This message displays when the battery in the keyless
access transmitter is low. Replace the battery in the
transmitter. See “Battery Replacement” underKeyless
Access System Operation on page 2-5.
3-85

THEFT ATTEMPTED
This symbol appears with
this message.
This message displays if the theft-deterrent system
has detected a break-in attempt while you were away
from your vehicle.
TRACTION ACTIVE
This message displays when the Traction Control
System (TCS) is actively limiting wheel spin. Slippery
road conditions may exist if this message is displayed,
so adjust your driving accordingly. The message stays on
for a few seconds after the TCS stops limiting wheel spin.
SeeTraction Control System (TCS) on page 4-10for more
information.
TRANS (Transmission) HOT IDLE
ENGINE
Notice:If you drive your vehicle while the
transmission uid is overheating and the
transmission temperature warning is displayed
on the instrument panel cluster and/or DIC, you
can damage the transmission. This could lead
to costly repairs that would not be covered by
your warranty. Do not drive your vehicle with
overheated transmission uid or while the
transmission temperature warning is displayed.
This message displays when the transmission uid in
your vehicle is too hot. Stop the vehicle and allow
it to idle until the transmission cools down or until
this message is removed.
3-95

Turn Signals When Towing a Trailer
The arrows on the instrument panel ash whenever
signaling a turn or lane change. Properly hooked up, the
trailer lamps also ash, telling other drivers the vehicle
is turning, changing lanes or stopping.
When towing a trailer, the arrows on the instrument
panel ash for turns even if the bulbs on the trailer
are burned out. For this reason you may think other
drivers are seeing the signal when they are not.
It is important to check occasionally to be sure the
trailer bulbs are still working.
The vehicle has bulb warning lights. When a trailer
lighting system is plugged into the vehicle’s lighting
system, its bulb warning lights may not let you know if
one of the lamps goes out. So, when the trailer lighting
system is plugged in, be sure to check the vehicle and
trailer lamps from time to time to be sure they are all
working. Once the trailer lamps are disconnected, the
bulb warning lights again can tell you if one of the vehicle
lamps is out.
Driving On Grades
Reduce speed and shift to a lower gearbeforestarting
down a long or steep downgrade. If the transmission is
not shifted down, the brakes might have to be used so
much that they would get hot and no longer work well.
On a long uphill grade, shift down and reduce the
vehicle’s speed to around 45 mph (70 km/h) to reduce
the possibility of the engine and the transmission
overheating.
Vehicles can tow in D (Drive). Shift the transmission to
a lower gear if the transmission shifts too often under
heavy loads and/or hilly conditions.
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 the engine is
turned off immediately after towing at high altitude on
steep uphill grades, the 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 P (Park) for a few minutes before turning
the engine off. If the overheat warning comes on, see
Engine Overheating on page 5-34.
4-37

Parking on Hills
{CAUTION:
Parking the vehicle on a hill with the trailer
attached can be dangerous. If something goes
wrong, the rig could start to move. People can be
injured, and both the vehicle and the trailer can be
damaged. When possible, always park the rig on a
at surface.
If parking the rig on a hill:
1. Press the brake pedal, but do not shift into P (Park)
yet. Turn the wheels into the curb if facing downhill
or into traffic if facing uphill.
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.
4. Reapply the brake pedal. Then apply the parking
brake and shift into P (Park).
5. Release the brake pedal.
Leaving After Parking on a Hill
1. Apply and hold the brake pedal while you:
Start the 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
The vehicle needs service more often when pulling a
trailer. See this manual’s Maintenance Schedule
or Index for more information. Things that are especially
important in trailer operation are automatic transmission
uid, engine oil, axle lubricant, belts, cooling system
and brake system. It is a good idea to inspect
these before and during the trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Engine Cooling When Trailer Towing
The cooling system may temporarily overheat during
severe operating conditions. SeeEngine Overheating on
page 5-34.
4-38

Service............................................................5-3
Accessories and Modications..........................5-3
California Proposition 65 Warning.....................5-4
California Perchlorate Materials Requirements......5-4
Doing Your Own Service Work.........................5-4
Adding Equipment to the Outside of
the Vehicle.................................................5-5
Fuel................................................................5-5
Gasoline Octane............................................5-5
Gasoline Specications....................................5-6
California Fuel...............................................5-6
Additives.......................................................5-7
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...................................................5-18
Engine Oil Life System..................................5-21
Engine Air Cleaner/Filter................................5-23
Automatic Transmission Fluid.........................5-25
Cooling System............................................5-26
Engine Coolant.............................................5-27
Coolant Surge Tank Pressure Cap..................5-34
Engine Overheating.......................................5-34Overheated Engine Protection
Operating Mode........................................5-36
Power Steering Fluid.....................................5-37
Windshield Washer Fluid................................5-38
Brakes........................................................5-39
Battery........................................................5-42
Jump Starting...............................................5-42
All-Wheel Drive..............................................5-47
Rear Axle.......................................................5-48
Front Axle......................................................5-49
Headlamp Aiming...........................................5-50
Bulb Replacement..........................................5-51
High Intensity Discharge (HID) Lighting............5-51
Halogen Bulbs..............................................5-51
Back-Up Lamps............................................5-52
Replacement Bulbs.......................................5-52
Windshield Replacement.................................5-52
Windshield Wiper Blade Replacement..............5-52
Tires..............................................................5-54
Winter Tires.................................................5-55
Tire Sidewall Labeling...................................5-56
Tire Terminology and Denitions.....................5-59
Run-Flat Tires (STS-V)..................................5-62
Ination - Tire Pressure.................................5-64
High-Speed Operation...................................5-65
Tire Pressure Monitor System.........................5-66
Tire Pressure Monitor Operation.....................5-68
Section 5 Service and Appearance Care
5-1

CAUTION: (Continued)
Do not run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine re, and you could be burned.
Get any leak xed before you drive the vehicle.
Notice:Using coolant other than DEX-COOL
®can
cause premature engine, heater core, or radiator
corrosion. In addition, the engine coolant could
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs rst. Any repairs
would not be covered by the vehicle warranty.
Always use DEX-COOL
®(silicate-free) coolant
in the vehicle.
Engine Coolant
The cooling system in the vehicle is lled with
DEX-COOL®engine coolant. This coolant is designed
to remain in the vehicle for ve years or 150,000 miles
(240 000 km), whichever occurs rst.
The following explains the cooling system and how to
check and add coolant when it is low. If there is a problem
with engine overheating, seeEngine Overheating on
page 5-34.
5-27