2009 CADILLAC STS heater

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

What to Use
{CAUTION:
Adding only plain water to the cooling system can
be dangerous. Plain water, or some other liquid
such as alcohol, can boil before the proper coolant
mixture will. The vehicle’s coolant warning system
is set for the proper coolant mixture. With plain
water or the wrong mixture, the engine could get
too hot but you would not get the overheat
warning. The engine could catch re and you or
others could be burned. Use a 50/50 mixture of
clean, drinkable water and DEX-COOL
®coolant.Use a 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant. If using this mixture, nothing else
needs to be added. This mixture:
Gives freezing protection down to−34°F (−37°C),
outside temperature.
Gives boiling protection up to 265°F (129°C),
engine temperature.
Protects against rust and corrosion.
Will not damage aluminum parts.
Helps keep the proper engine temperature.
Notice:If an improper coolant mixture is used,
the engine could overheat and be badly damaged.
The repair cost would not be covered by the vehicle
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core, and
other parts.
Notice:If extra inhibitors and/or additives are used
in the vehicle’s cooling system, the vehicle could
be damaged. Use only the proper mixture of
the engine coolant listed in this manual for the
cooling system. SeeRecommended Fluids and
Lubricants on page 6-13for more information.
5-28

If No Steam Is Coming From The
Engine Compartment
An overheat warning, can indicate a serious problem.
If an engine overheat warning is displayed but no steam
can be seen or heard, the problem may not be too
serious. Sometimes the engine can get a little too hot
when the vehicle:
Climbs a long hill on a hot day.
Stops after high-speed driving.
Idles for long periods in traffic.
Tows a trailer.
If the overheat warning is displayed with no sign of
steam:
1. Turn the air off.
2. Turn the heater on to the highest temperature and
to the highest fan speed. Open the windows as
necessary.
3. In heavy traffic, let the engine idle in N (Neutral)
while stopped. If it is safe to do so, pull off the
road, shift to P (Park) or N (Neutral) and let
the engine idle.
If the engine coolant temperature gage is no longer
in the overheat zone or an overheat warning no longer
displays, the vehicle can be driven. Continue to drive the
vehicle slow for about 10 minutes. Keep a safe vehicle
distance from the car in front of you. If the warning does
not come back on, continue to drive normally.If the warning continues, pull over, stop, and park the
vehicle right away.
If there is no sign of steam, idle the engine for
three minutes while parked. If the warning is still
displayed, turn off the engine until it cools down.
Also, see″Overheated Engine Protection Operating
Mode″later in this section.
Overheated Engine Protection
Operating Mode
This operating mode allows your vehicle to be driven
to a safe place in an emergency. Should an overheated
engine condition exist, an overheat protection mode
which alternates ring groups of cylinders helps prevent
engine damage. In this mode, you will notice a loss in
power and engine performance. An engine overheat
warning will indicate that an overheat condition exists.
Driving extended miles (km) and/or towing a trailer in
the overheat protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any repair.
The engine oil will be severely degraded. Repair the
cause of coolant loss and change the oil. SeeEngine
Oil on page 5-18.
5-36

Electrical System (cont.)
Windshield Wiper Fuses.............................5-113
Engine
Air Cleaner/Filter.........................................5-23
Check and Service Engine Soon Lamp...........3-66
Coolant......................................................5-27
Coolant Heater............................................2-29
Coolant Temperature Gage...........................3-65
Coolant Temperature Warning Light................3-64
Drive Belt Routing.......................................6-16
Engine Compartment Overview......................5-12
Exhaust.....................................................2-36
Oil .............................................................5-18
Oil Life System...........................................5-21
Overheated Protection Operating Mode...........5-36
Overheating................................................5-34
Starting......................................................2-27
Enhanced StabiliTrak
®....................................... 4-6
Entry Lighting.................................................3-41
Event Data Recorders.....................................7-17
Extender, Safety Belt.......................................1-27
Exterior Lighting Battery Saver..........................3-40
F
Filter
Engine Air Cleaner......................................5-23
Finish Damage.............................................5-111
Flashers, Hazard Warning.................................. 3-6Flash-to-Pass.................................................3-13
Flat Tire........................................................5-84
Flat Tire, Changing.........................................5-94
Flat Tire, Storing...........................................5-102
Fluid
Automatic Transmission................................5-25
Power Steering...........................................5-37
Windshield Washer......................................5-38
Fog Lamp
Fog ...........................................................3-38
Fog Lamp Light..............................................3-70
Forward Collision Alert (FAC) System.................. 3-9
Front Axle......................................................5-49
Fuel............................................................... 5-5
Additives...................................................... 5-7
California Fuel.............................................. 5-6
Filling a Portable Fuel Container....................5-10
Filling the Tank............................................. 5-8
Fuels in Foreign Countries.............................. 5-7
Gage .........................................................3-71
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-6
Fuses
Fuses and Circuit Breakers.........................5-113
Rear Underseat Fuse Block.........................5-118
Underhood Fuse Block...............................5-114
Windshield Wiper.......................................5-113
5

G
Gage
Engine Coolant Temperature.........................3-65
Fuel..........................................................3-71
Speedometer..............................................3-57
Tachometer.................................................3-57
Garage Door Opener.......................................2-53
Gasoline
Octane........................................................ 5-5
Specications............................................... 5-6
Glove Box.....................................................2-60
GM Mobility Reimbursement Program.................. 7-7
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-5
Headlamp
Aiming .......................................................5-50
Headlamp Wiring...........................................5-113
Headlamps....................................................3-32
Bulb Replacement.......................................5-51
Daytime Running Lamp................................3-36
Flash-to-Pass..............................................3-13
Halogen Bulbs............................................5-51
High Intensity Discharge (HID) Lighting...........5-51
High/Low Beam Changer................................ 3-9Headlamps (cont.)
On Reminder..............................................3-36
Washer......................................................3-16
Wiper Activated...........................................3-36
Head-Up Display (HUD)...................................3-43
Heated Seats................................................... 1-3
Heated Steering Wheel..................................... 3-7
Heater...........................................................3-48
Engine Coolant...........................................2-29
Highbeam On Light.........................................3-70
High-Speed Operation, Tires.............................5-65
Highway Hypnosis...........................................4-19
Hill and Mountain Roads..................................4-20
Hood
Checking Things Under................................5-10
Release.....................................................5-11
Horn ............................................................... 3-6
How to Wear Safety Belts Properly...................1-12
I
Ignition Positions.............................................2-26
Immobilizer....................................................2-24
Immobilizer Operation......................................2-24
Inadvertent Power Battery Saver.......................3-42
Infants and Young Children, Restraints...............1-31
Ination - Tire Pressure...................................5-64
Inator Kit, Tire...............................................5-87
6