2008 CADILLAC CTS engine overheat

{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 hot light is on, both fans should be running.
If they are not, your vehicle needs service.Notice:Engine damage from running your engine
without coolant is not covered by your warranty.
SeeOverheated Engine Protection Operating Mode
on page 5-33for information on driving to a safe
place in an emergency.
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.
5-35

How to Add Coolant to the Coolant
Surge Tank
If you have not found a problem yet, check to see if
coolant is visible in the surge tank. If coolant is visible but
the coolant level is not at the FROID/FULL COLD line on
the side of the coolant surge tank, add a 50/50 mixture of
clean, drinkable water and DEX-COOL
®coolant at the
coolant surge tank, but be sure the cooling system,
including the coolant surge tank pressure cap, is cool
before you do it. SeeEngine Coolant on page 5-28for
more information.
{CAUTION:
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the coolant
surge tank pressure cap — even a little — they
can come out at high speed. Never turn the
cap when the cooling system, including the
coolant surge tank pressure cap, is hot. Wait
for the cooling system and coolant surge tank
pressure cap to cool if you ever have to turn
the pressure cap.
{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.
Notice:In cold weather, water can freeze and crack
the engine, radiator, heater core and other parts.
Use the recommended coolant and the proper
coolant mixture.
5-36

Engine
Air Cleaner/Filter.........................................5-21
Check and Service Engine Soon Light............3-41
Coolant......................................................5-28
Coolant Heater............................................2-37
Coolant Temperature Gage...........................3-40
Coolant Temperature Warning Light................3-40
Cover........................................................5-21
Drive Belt Routing.......................................6-17
Engine Compartment Overview......................5-14
Exhaust.....................................................2-48
Oil .............................................................5-16
Oil Life System...........................................5-19
Oil Pressure Gage.......................................3-45
Overheated Protection Operating Mode...........5-33
Overheating................................................5-31
Speed Limiter.............................................3-32
Starting......................................................2-35
Entry Lighting.................................................3-20
Event Data Recorders.....................................7-19
Extender, Safety Belt.......................................1-32
Exterior Lighting Battery Saver..........................3-20
F
Filter
Engine Air Cleaner......................................5-21
Finish Damage.............................................5-119
Flashers, Hazard Warning.................................. 3-6Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-82
Flat Tire, Changing........................................5-102
Flat Tire, Storing...........................................5-110
Fluid.............................................................5-26
Automatic Transmission................................5-25
Power Steering...........................................5-39
Windshield Washer......................................5-40
Fog Lamp
Fog ...........................................................3-19
Fog Lamp Light..............................................3-46
Folding Rear Seat...........................................1-11
Fuel............................................................... 5-6
Additives...................................................... 5-8
California Fuel.............................................. 5-7
Filling a Portable Fuel Container....................5-11
Filling the Tank............................................. 5-9
Fuels in Foreign Countries.............................. 5-8
Gage .........................................................3-47
Gasoline Octane........................................... 5-7
Gasoline Specications.................................. 5-7
Running Out of...........................................2-49
Fuses
Fuses and Circuit Breakers.........................5-123
Rear Compartment Fuse Block....................5-126
Underhood Fuse Block...............................5-123
Windshield Wiper.......................................5-122
5

N
Navigation System, Privacy..............................7-20
Navigation/Radio System,
see Navigation Manual...............................3-111
New Vehicle Break-In......................................2-32
O
Odometer......................................................3-32
Odometers, Trip..............................................3-32
Off-Road Recovery..........................................4-12
Oil
Engine.......................................................5-16
Engine Oil Pressure Gage............................3-45
Pressure Light.............................................3-44
Oil, Engine Oil Life System..............................5-19
Older Children, Restraints................................1-32
Online Owner Center........................................ 7-5
OnStar, Privacy..............................................7-20
OnStar
®System, see OnStar®Manual...............2-55
Operation, Universal Home Remote System........2-58
Outlet Adjustment............................................3-28
Outlets
Accessory Power.........................................3-22
Outside
Convex Mirror.............................................2-51
Heated Mirrors............................................2-51
Power Mirrors.............................................2-50Overheated Engine Protection Operating Mode . . . 5-33
Owner Checks and Services.............................6-10
Owners, Canadian.............................................. iii
P
Paint, Damage..............................................5-119
Panic Brake Assist............................................ 4-9
Parade Dimming.............................................3-20
Park
Shifting Into................................................2-45
Shifting Out of............................................2-47
Park Aid........................................................2-52
Park Brake....................................................2-44
Park Tilt Mirrors..............................................2-51
Parking
Assist........................................................2-52
Over Things That Burn.................................2-48
Parking Your Vehicle.......................................2-47
Passenger Airbag Status Indicator.....................3-35
Passenger Compartment Air Filter.....................3-29
Passenger Sensing System..............................1-65
Passing.........................................................4-12
Perchlorate Materials Requirements, California...... 5-5
Phone
Bluetooth
®................................................3-111
Power
Door Locks.................................................2-19
Electrical System.......................................5-122
9