2004 CADILLAC CTS overheating

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....................................5-5
California Fuel...............................................5-6
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-7
Filling Your Tank............................................5-7
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 Air Cleaner/Filter................................5-24
Automatic Transmission Fluid.........................5-25
Manual Transmission Fluid.............................5-27
Hydraulic Clutch (Manual Transmission)...........5-28
Engine Coolant.............................................5-29
Coolant Surge Tank Pressure Cap..................5-31
Engine Overheating.......................................5-31
Cooling System............................................5-34
Power Steering Fluid.....................................5-40Windshield Washer Fluid................................5-41
Brakes........................................................5-42
Battery........................................................5-45
Jump Starting...............................................5-46
Rear Axle.......................................................5-51
Bulb Replacement..........................................5-52
High Intensity Discharge (HID) Lighting............5-52
Halogen Bulbs..............................................5-52
Headlamps..................................................5-52
Front Turn Signal and Fog Lamps...................5-53
Center High-Mounted Stoplamp (CHMSL).........5-53
Taillamps, Turn Signal, Stoplamps and
Sidemarker Lamps.....................................5-54
Back-Up and License Plate Lamps..................5-55
Replacement Bulbs.......................................5-56
Windshield Wiper Blade Replacement..............5-56
Tires..............................................................5-58
Run-Flat Tires (CTS-V) ..................................5-66
Ination - Tire Pressure.................................5-67
Tire Pressure Monitor System (CTS-V) ............5-70
Tire Inspection and Rotation...........................5-72
When It Is Time for New Tires.......................5-73
Buying New Tires.........................................5-74
Uniform Tire Quality Grading..........................5-75
Section 5 Service and Appearance Care
5-1

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 5 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 5-31.
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.
Let the warning lights and gages 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 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-halfclean, drinkable waterand
one-half DEX-COOL®coolant which won’t damage
aluminum parts. If you use this coolant mixture,
you don’t 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.
5-29

Adding Coolant
If you need more coolant, add the proper DEX-COOL®
coolant mixture at the surge tank, but only when the
engine is cool.
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol,
and it will burn if the engine parts are hot
enough. Do not spill coolant on a hot engine.
When replacing the pressure cap, make sure it
is hand-tight.
Coolant Surge Tank Pressure Cap
Notice:If the surge tank pressure cap is not tightly
installed, coolant loss and possible engine damage
may occur. Be sure the cap is properly and
tightly secured.
Engine Overheating
There are three engine hot messages that may be
displayed in the Driver Information Center (DIC).
SeeDIC Warnings and Messages on page 3-70
for more information.
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. A low coolant and/or
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.
5-31

The coolant level should be at or slightly above the
FULL COLD/FROID line on the side of the coolant surge
tank. If it isn’t, you may have a leak at the pressure
cap or in the radiator hoses, heater hoses, radiator,
water pump or somewhere else in the cooling system.
{CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Do not touch them.
If you do, you can be burned.
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.
If there seems to be no leak, with the engine on, check
to see if the electric engine cooling fans are running.
If the engine is overheating, both fans should be
running. If they aren’t, your vehicle needs service.
Notice:Engine damage from running your engine
without coolant is not covered by your warranty.
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 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.
5-35

Tires
Your new vehicle comes with high-quality tires made by
a leading tire manufacturer. If you ever have questions
about your tire warranty and where to obtain service,
see your GM Warranty booklet for details. For additional
information refer to the tire manufacturer’s booklet
included with your vehicle’s Owner’s Manual.
{CAUTION:
Poorly maintained and improperly used
tires are dangerous.
Overloading your tires can cause
overheating as a result of too much
friction. You could have an air-out and a
serious accident. SeeLoading Your
Vehicle on page 4-34.
CAUTION: (Continued)
CAUTION: (Continued)

Underinated tires pose the same danger
as overloaded tires. The resulting accident
could cause serious injury. Check all tires
frequently to maintain the recommended
pressure. Tire pressure should be
checked when your tires are cold.
SeeInflation - Tire Pressure on page 5-67.
Overinated tires are more likely to be cut,
punctured or broken by a sudden impact,
such as when you hit a pothole. Keep tires
at the recommended pressure.
Worn, old tires can cause accidents.
If your tread is badly worn, or if your tires
have been damaged, replace them.
SeeInflation - Tire Pressure on page 5-67
for ination pressure adjustment for high
speed driving.
5-58

Engine
Air Cleaner/Filter.........................................5-24
Battery.......................................................5-45
Check and Service Engine Soon Light............3-47
Check Oil Pressure Message........................3-58
Coolant......................................................5-29
Coolant Heater............................................2-25
Coolant Temperature Gage...........................3-46
Coolant Temperature Warning Light................3-45
Engine Compartment Overview......................5-12
Exhaust.....................................................2-39
Oil .............................................................5-18
Oil Temperature Warning Message.................3-58
Overheating................................................5-31
Starting......................................................2-24
Engine Coolant Hot – AC (Air Conditioning) Off......3-76
Engine Coolant Hot – Idle Engine.....................3-76
Engine Cooling When Trailer Towing..................4-45
Engine Oil Additives........................................5-21
Engine Overheated – Stop Engine....................3-77
Engine Power Reduced...................................3-77
Engine Specications.....................................5-112
Engine Speed Limiter......................................3-41
Entering the Personalization Menu.....................3-89
Entry Lighting.................................................3-27
Erasing HomeLink
®Buttons..............................2-50
Event Data Recorders (EDR)............................. 7-9Exiting the Personalization Menu.....................3-107
Express-Down Window....................................2-15
Express-Up Window........................................2-15
Extender, Safety Belt.......................................1-28
Exterior Lamps...............................................3-24
Exterior Lighting Battery Saver..........................3-26
F
Filter
Engine Air Cleaner......................................5-24
Finding a Station...........................................3-110
Finish Care....................................................5-95
Finish Damage...............................................5-97
Five-Speed (CTS)...........................................2-33
Flash-To-Pass Feature.....................................3-11
Flat Tire........................................................5-79
Flat Tire, Changing.........................................5-81
Fluid
Automatic Transmission................................5-25
Manual Transmission....................................5-27
Power Steering...........................................5-40
Windshield Washer......................................5-41
FM Stereo....................................................3-125
Fog Lamp Light..............................................3-51
Fog Lamps....................................................3-13
6