engine overheat CADILLAC CTS 2018 User Guide

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
252 VEHICLE CARE
Vehicle Care
General Information
General Information . . . . . . . . . . . . . 253
California Proposition65 Warning . . . . . . . . . . . . . . . . . . . . . 253
California Perchlorate Materials Requirements . . . . . . . . . . . . . . . . . . . 254
Accessories and Modifications . . . . . . . . . . . . . . . . . . . 254
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . . . . . . 254
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . . . . . . 256
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . 263
Engine Oil Life System . . . . . . . . . . . 265
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Engine Air Cleaner/Filter . . . . . . . . . 267
Cooling System . . . . . . . . . . . . . . . . . . . 269
Engine Overheating . . . . . . . . . . . . . . 274
Washer Fluid . . . . . . . . . . . . . . . . . . . . . 275
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . 276
Battery - North America . . . . . . . . . 277
All-Wheel Drive . . . . . . . . . . . . . . . . . . 279 Starter Switch Check . . . . . . . . . . . . . 279
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
Park Brake and P (Park)
Mechanism Check . . . . . . . . . . . . . . 280
Wiper Blade Replacement . . . . . . . 280
Windshield Replacement . . . . . . . . 281
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . 281
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . . . . . 282
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . . . . . 283
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . 283
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . . . . . . . . . . . 283
LED Lighting . . . . . . . . . . . . . . . . . . . . . 283
Back-Up Lamps . . . . . . . . . . . . . . . . . . . 283
License Plate Lamp . . . . . . . . . . . . . . 284
Electrical System
Electrical System Overload . . . . . . 285
Fuses and Circuit Breakers . . . . . . 285
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
Instrument Panel Fuse Block . . . . 289
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
All-Season Tires . . . . . . . . . . . . . . . . . . 295
Winter Tires . . . . . . . . . . . . . . . . . . . . . . 295
Run-Flat Tires . . . . . . . . . . . . . . . . . . . . 295
Low-Profile Tires . . . . . . . . . . . . . . . . . 296
Summer Tires . . . . . . . . . . . . . . . . . . . . 296
Tire Sidewall Labeling . . . . . . . . . . . 297
Tire Designations . . . . . . . . . . . . . . . . . 298
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . . . . . 299
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . 301
Tire Pressure for High-Speed Operation . . . . . . . . . . . . . . . . . . . . . . . . 302
Tire Pressure Monitor System . . . 303
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . . . . . . . . . . 304
Tire Inspection . . . . . . . . . . . . . . . . . . . 307
Tire Rotation . . . . . . . . . . . . . . . . . . . . . 307
When It Is Time for New Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Buying New Tires . . . . . . . . . . . . . . . . 309
Different Size Tires and Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Uniform Tire Quality Grading . . . 311
Wheel Alignment and Tire Balance . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Wheel Replacement . . . . . . . . . . . . . . 313
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . 313
If a Tire Goes Flat . . . . . . . . . . . . . . . . 314

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
270 VEHICLE CARE
3.6L V6 Engine (LF3)
1. Engine Coolant Surge Tankand Pressure Cap
2. Engine Cooling Fan (Out of View)
6.2L V8 Engine (LT4)
1. Engine Coolant Surge Tank
and Pressure Cap
2. Engine Cooling Fan (Out of View)
{Warning
An underhood electric fan can start
up even when the engine is not
running and can cause injury. Keep
hands, clothing, and tools away
from any underhood electric fan.
{Warning
Do not touch heater or radiator
hoses, or other engine parts. They
can be very hot and can burn you.
Do not run the engine if there is a
leak; all coolant could leak out.
That could cause an engine fire and
can burn you. Fix any leak before
driving the vehicle.
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL engine coolant.
See Maintenance Schedule 0339 and
Recommended Fluids and Lubricants
0 348.
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, see
Engine Overheating 0274.

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
272 VEHICLE CARE
Be sure the cooling system is cool
before this is done.
It is normal for the coolant level in
the bottom chamber to rise and fall
with operating temperature and
ambient conditions. Coolant will
evaporate from the bottom chamber
in normal operation. This will happen
faster when the vehicle is driven for
long periods in hot, dry conditions.
If no coolant is visible in the coolant
surge tank, add coolant as follows:
How to Add Coolant to the
Coolant Surge Tank
{Warning
Spilling coolant on hot engine parts
can burn you. Coolant contains
ethylene glycol and it will burn if
the engine parts are hot enough.
{Warning
Plain water, or other liquids such as
alcohol, can boil before the proper
coolant mixture will. With plain
water or the wrong mixture, the
engine could get too hot but there
would not be an overheat warning.
The engine could catch fire and you
or others could be burned.
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure cap,
even a little, can cause them to
come out at high speed and you
could be burned. Never turn the cap
when the cooling system, including
the pressure cap, is hot. Wait for
the cooling system and pressure
cap to cool.
Caution
Failure to follow the specific
coolant fill procedure could cause
the engine to overheat and could
cause system damage. If coolant is
not visible in the surge tank,
contact your dealer.
If no problem is found, check to see if
coolant is visible in the coolant surge
tank. If coolant is visible but the
coolant level is not at the bottom of
the fill neck, 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.

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
274 VEHICLE CARE
Engine Overheating
The vehicle has an indicator to warn
of the engine overheating.
If the decision is made not to lift the
hood when this warning appears, get
service help right away. SeeRoadside
Service 0361.
If the decision is made to lift the
hood, make sure the vehicle is parked
on a level surface.
Then check to see if the engine
cooling fan is running. If the engine is
overheating, the fan should be
running. If it is not, do not continue
to run the engine. Have the vehicle
serviced.
Caution
Do not run the engine if there is a
leak in the engine cooling system.
This can cause a loss of all coolant
and can damage the system and
vehicle. Have any leaks fixed
right away.
If Steam Is Coming from the
Engine Compartment
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure cap,
even a little, can cause them to
come out at high speed and you
could be burned. Never turn the cap
when the cooling system, including
the pressure cap, is hot. Wait for
the cooling system and pressure
cap to cool.
If Steam Is Coming from the
Engine Compartment with No
Overheat Warning
(V-Series Only)
The V-Series hood vent is functional,
and will allow water from rain and car
washes to enter the engine
compartment and contact hot
surfaces. If steam is seen coming from
the hood vent with no accompanying
overheat warning, no action is
required.
If No Steam Is Coming from the
Engine Compartment
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.
If the overheat warning is displayed
with no sign of steam: 1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the highest
fan speed. Open the windows as
necessary.
3. When it is safe to do so, pull off the road, shift to P (Park) or
N (Neutral) and let the
engine idle.
If the overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
vehicle distance from the vehicle in

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
INDEX 385
Driving (cont'd)Track Events and Competitive . . . 180
Vehicle Load Limits . . . . . . . . . . . . . . 188
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 185
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . . . . . 167
E
Electric Parking Brake . . . . . . . . . . . . . . 204
Electric Parking Brake Light . . . . . . . 130
Electrical Equipment, Add-On . . . . . 251
Electrical SystemEngine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
Fuses and Circuit Breakers . . . . . . . 285
Instrument Panel Fuse Block . . . . 289
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 267
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 128
Compartment Overview . . . . . . . . . . 256
Coolant Temperature Gauge . . . . . 124 Engine (cont'd)
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . . 133
Cooling System . . . . . . . . . . . . . . . . . . . 269
Drive Belt Routing . . . . . . . . . . . . . . . . 356
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Oil Life System . . . . . . . . . . . . . . . . . . . . 265
Oil Pressure Light . . . . . . . . . . . . . . . . . 134
Overheating . . . . . . . . . . . . . . . . . . . . . . . 274
Power Messages . . . . . . . . . . . . . . . . . . 143
Running While Parked . . . . . . . . . . . 200
Starting . . . . . . . . . . . . . . . . . . . . . . . . 20, 194
Engine Oil
Temperature Gauge . . . . . . . . . . . . . . . 124
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 159
Equipment, Towing . . . . . . . . . . . .250, 251
Event Data Recorders . . . . . . . . . . . . . . 369
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 159
Extended Parking . . . . . . . . . . . . . . . . . . . 199
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 75
Exterior Lamp Controls . . . . . . . . . . . . 153
Exterior Lamps Off Reminder . . . . . . 155
Exterior Lighting Battery Saver . . . . 160
F
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Filter,
Engine Air Cleaner . . . . . . . . . . . . . . . . 267
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 155
Flashers, Hazard Warning . . . . . . . . . . 157
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
Fluid Automatic Transmission . . . . . . . . . 266
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 47
Forward Automatic Braking . . . . . . . . 235
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
Front Seats Heated and Ventilated . . . . . . . . . . . . . 64
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Economy Driving . . . . . . . . . . . . . . . . . . . 28
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 246
Filling the Tank . . . . . . . . . . . . . . . . . . . 244
Foreign Countries . . . . . . . . . . . . . . . . . 244
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Low Fuel Warning Light . . . . . . . . . 134
Requirements, California . . . . . . . . . 243

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349156) - 2018 - CRC - 9/29/17
388 INDEX
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Maintenance and Care Additional . . . . . . . . . . . . . . . . . . . . . . . . . 345
Maintenance Schedule . . . . . . . . . . . . . 339 Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . . . . 348
Malfunction Indicator Lamp . . . . . . . 128
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . 47
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . 202
Memory Features . . . . . . . . . . . . . . . . . . . . 13
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . 62
Messages Engine Power . . . . . . . . . . . . . . . . . . . . . 143
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . 144
Mirror Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . 48
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . 48
Automatic Dimming Rearview . . . . . 48
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . 48 Mirrors, Interior Rearview . . . . . . . . . . . 48
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Driver Control . . . . . . . . . . . . . . . . . . . . . 208
Monitor System, Tire Pressure . . . . . 303
N
Navigation OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Net, Convenience . . . . . . . . . . . . . . . . . . . 108
New Vehicle Break-In . . . . . . . . . . . . . . . 191
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Oil
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Engine Oil Life System . . . . . . . . . . . 265
Pressure Light . . . . . . . . . . . . . . . . . . . . . 134
Older Children, Restraints . . . . . . . . . . . 88
Online Owner Center . . . . . . . . . . . . . . . 360
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
OnStar Additional Information . . . . 377
OnStar Connections . . . . . . . . . . . . . . . . 374
OnStar Diagnostics . . . . . . . . . . . . . . . . . 376
OnStar Emergency . . . . . . . . . . . . . . . . . . 372
OnStar Navigation . . . . . . . . . . . . . . . . . . 373
OnStar Overview . . . . . . . . . . . . . . . . . . . . 371 OnStar Security . . . . . . . . . . . . . . . . . . . . . 373
Ordering
Service Publications . . . . . . . . . . . . . . 366
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Overheating, Engine . . . . . . . . . . . . . . . . 274
P
Park Shifting Into . . . . . . . . . . . . . . . . . . . . . . 197
Shifting Out of . . . . . . . . . . . . . . . . . . . . 198
Parking
Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 280
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Over Things That Burn . . . . . . . . . . . 199
Parking Assist . . . . . . . . . . . . . . . . . . . . . . . 226
Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . 226
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Passenger Sensing System . . . . . . . . . . 82
Perchlorate Materials Requirements, California . . . . . . . . . 254
Performance Data Recorder (PDR) . . . . . . . . . . . . . . . . . . . . 161