2007 CADILLAC CTS engine coolant

Transmission Fluid Hot Message
When you see this
ashing symbol, the
transmission uid
temperature is high
(290°F (143°C)).
To acknowledge this warning, press either button
on the outboard switch on the left spoke of the
steering wheel. After you press this button, the
warning will redisplay every 10 minutes until the
temperature returns to the normal operating range.
If this message appears, you may continue to drive
at a slower speed while monitoring the transmission
uid temperature. Ideally, the transmission oil
temperature should not rise above 265°F (129°C). If
you regularly experience temperatures above this
limit due to high performance operation, it is
recommended to use an auxiliary uid cooler for the
transmission and differential. See your dealer for
details. If this warning is displayed during normal
vehicle operation on at roads, your vehicle may
need service. See your dealer for an inspection.
SeeDIC Warnings and Messages on page 232and
Manual Transmission Fluid on page 354for more
information.
Hot Coolant Temperature Warning
Message
When you see this
ashing symbol, the
engine coolant
temperature is high
(257°F (125°C)).
To acknowledge this warning, press either button
on the outboard switch on the left spoke of the
steering wheel. After you press a button, this
warning will come on every 10 minutes until the
temperature returns to the normal operating range.
Driving aggressively or driving on long hills can
cause the engine coolant temperature to be higher
than normal. The Engine Coolant Temperature
Warning Light should also come on. SeeEngine
Coolant Temperature Warning Light (CTS) on
page 207for more information. If this warning is
displayed during normal vehicle operation on
at roads, your vehicle may need service.
See your dealer for an inspection.
219

Check Tire Pressure
If your vehicle has a Tire Pressure Monitor (TPM)
system, this message indicates that one or
more of the vehicle’s tires are low. SeeStatus of
Vehicle Systems on page 223for information
on checking your vehicle’s tire pressures. Also,
seeTire Pressure Monitor System on page 405
andInation - Tire Pressure on page 402for
more information.
Check Washer Fluid
When this message appears on the display, it
means that your vehicle is low on windshield
washer uid. You should rell the windshield
washer uid reservoir as soon as possible. See
Windshield Washer Fluid on page 369for
more information.
Competitive Driving (CTS-V)
When competitive driving mode is turned on with
the TC (traction control) button, this message
will be displayed on the DIC. The TC light will be
on when the competitive driving mode is on.
The Traction Control System (TCS) will not
operate while in competitive driving mode. You
should adjust your driving accordingly. Seethe CTS-V portion ofTraction Control System
(TCS) (CTS) on page 293orTraction Control
System (TCS) (CTS-V) on page 295for more
information.
Driver Door Ajar
When this message appears on the display, it
means that the driver’s door was not closed
completely. You should make sure that the driver’s
door is closed completely.
Engine Coolant Hot – AC
(Air Conditioning) Off
This message displays when the engine coolant
becomes hotter than the normal operating
temperature. To avoid added strain on a hot
engine, the air conditioning compressor is
automatically turned off. When the coolant
temperature returns to normal, the air conditioning
compressor will turn back on. You can continue
to drive your vehicle.
If this message continues to appear, have the
system repaired by your dealer as soon as
possible to avoid damage to the engine or
transmission.
236

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 360for more information.
This message will appear when the engine coolant
temperature is too hot. Stop and allow the
vehicle to idle until it cools down.
Engine Power Reduced
This message informs you that the vehicle is
reducing engine power to try to protect the engine
or transmission from damage due to extreme
operating conditions. Reduced engine power can
affect the vehicle’s ability to accelerate. If this
message is on, but there is no reduction in
performance, proceed to your destination. The
performance may be reduced the next time
the vehicle is driven. The vehicle may be driven at
a reduced speed while this message is on, but
acceleration and speed may be reduced.Anytime this message stays on, the vehicle should
be taken to your dealer for service as soon as
possible.
Fuel Level Low
When this message appears on the display, it
means that your vehicle is low on fuel. You should
rell the fuel tank as soon as possible. A single
chime will sound when this message is displayed.
Headlamps Suggested
This message will appear when the amount of
available light outside the vehicle is low and
the exterior lamp control is off. This message
informs the driver that turning on the exterior lamps
is recommended even though the daytime
running lamps (DRL) are still illuminated and it has
become dark enough outside to require the
headlamps and/or other exterior lamps.
This message will also appear when the
windshield wipers have been on for more than
six seconds and the exterior lamp control is off or
in the parking lamp position.
237

Service........................................................ 332
Accessories and Modications................... 332
California Proposition 65 Warning.............. 333
Doing Your Own Service Work.................. 333
Adding Equipment to the Outside of
Your Vehicle.......................................... 334
Fuel............................................................. 334
Gasoline Octane........................................ 334
Gasoline Specications.............................. 335
California Fuel........................................... 335
Additives................................................... 336
Fuels in Foreign Countries........................ 336
Filling the Tank......................................... 337
Filling a Portable Fuel Container............... 339
Checking Things Under the Hood.............. 340
Hood Release........................................... 341
Engine Compartment Overview.................. 342
Engine Oil................................................. 346
Engine Oil Life System.............................. 349
Engine Air Cleaner/Filter............................ 351
Automatic Transmission Fluid.................... 353
Manual Transmission Fluid........................ 354Hydraulic Clutch........................................ 356
Engine Coolant.......................................... 356
Coolant Surge Tank Pressure Cap............ 360
Engine Overheating................................... 360
Overheated Engine Protection
Operating Mode..................................... 362
Cooling System......................................... 363
Power Steering Fluid................................. 368
Windshield Washer Fluid........................... 369
Brakes...................................................... 371
Battery...................................................... 375
Jump Starting............................................ 376
Rear Axle.................................................... 382
Headlamp Aiming........................................ 383
Bulb Replacement....................................... 386
High Intensity Discharge (HID) Lighting..... 386
Halogen Bulbs........................................... 386
Front Turn Signal and Fog Lamps............. 387
Taillamps, Turn Signal, Stoplamps and
Sidemarker Lamps................................. 388
Back-Up and License Plate Lamps............ 389
Replacement Bulbs................................... 389
Section 5 Service and Appearance Care
329

Checking Things Under
the Hood
{CAUTION:
An electric fan under the hood can start up
and injure you even when the engine is not
running. Keep hands, clothing, and tools
away from any underhood electric fan.
{CAUTION:
Things that burn can get on hot engine
parts and start a re. These include
liquids like fuel, oil, coolant, brake uid,
windshield washer and other uids, and
plastic or rubber. You or others could be
burned. Be careful not to drop or spill
things that will burn onto a hot engine.
340

A. Underhood Fuse Block. SeeUnderhood Fuse
Block on page 447.
B. Windshield Washer Fluid Reservoir. See
“Adding Washer Fluid” underWindshield
Washer Fluid on page 369.
C. Battery. SeeBattery on page 375.
D. Passenger Compartment Air Filter. See
Passenger Compartment Air Filter on page 195.
E. Power Steering Fluid Reservoir (Under
Engine Cover). SeePower Steering Fluid on
page 368.
F. Engine Oil Fill Cap. See “When to Add Engine
Oil” underEngine Oil on page 346.G. Engine Oil Dipstick (Out of View). See
“Checking Engine Oil” underEngine Oil on
page 346.
H. Brake Master Cylinder Reservoir. See “Brake
Fluid” underBrakes on page 371.
I. Hydraulic Clutch Reservoir (If Equipped) (Not
Shown). See “When to Check and What to Use”
underHydraulic Clutch on page 356.
J. Engine Coolant Surge Tank and Pressure Cap.
SeeCoolant Surge Tank Pressure Cap on
page 360andCooling System on page 363.
K. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 351.
343

A. Underhood Fuse Block. SeeUnderhood Fuse
Block on page 447.
B. Windshield Washer Fluid Reservoir. See
“Adding Washer Fluid” underWindshield
Washer Fluid on page 369.
C. Battery. SeeBattery on page 375.
D. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil on page 346.
E. Passenger Compartment Air Filter. See
Passenger Compartment Air Filter on page 195.
F. Engine Oil Fill Cap. See “When to Add
Engine Oil” underEngine Oil on page 346.G. Power Steering Fluid Reservoir. SeePower
Steering Fluid on page 368.
H. Brake Master Cylinder Reservoir. See “Brake
Fluid” underBrakes on page 371.
I. Hydraulic Clutch Reservoir. See “When to
Check and What to Use” underHydraulic
Clutch on page 356.
J. Engine Coolant Surge Tank and Pressure Cap.
SeeCoolant Surge Tank Pressure Cap on
page 360andCooling System on page 363.
K. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 351.
345

Hydraulic Clutch
It is not necessary to regularly check clutch uid
unless you suspect there is a leak in the system.
Adding uid will not correct a leak.
A uid loss in this system could indicate a
problem. Have the system inspected and repaired.
When to Check and What to Use
The hydraulic clutch
uid reservoir cap has
this symbol on it.
SeeEngine
Compartment Overview
on page 342for
reservoir location.
Refer to the Maintenance Schedule to determine
how often you should check the uid level in
your clutch master cylinder reservoir and for the
proper uid to use. SeeOwner Checks and
Services on page 469andRecommended Fluids
and Lubricants on page 473.
How to Check and Add Fluid
Make sure the uid level is at the MIN (Minimum)
line on the side of the reservoir. If it is not,
remove the cap and add the proper uid until the
level reaches the MIN line.
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 ve 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 360.
356