2018 CADILLAC ATS engine overheat

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
VEHICLE CARE 253
Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the cap
is properly and tightly secured.
How to Add Coolant to the CAC
Bottle
{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.
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.The CAC bottle pressure cap can be
removed when the Charged Air
Coolant cooling system, including the
CAC bottle pressure cap, is no
longer hot.
1. Turn the pressure cap slowly
counterclockwise and remove it.
2. Fill the CAC bottle with the proper mixture to the cold fill
mark pointed to on the front of
the CAC bottle.
3. Replace the pressure cap tightly.
Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the cap
is properly and tightly secured.
Engine Overheating
The vehicle has an engine coolant
temperature gauge and an engine
temperature light to warn of engine
overheating.
There are also engine hot messages
that may display in the Driver
Information Center (DIC).
If the decision is made not to lift the
hood when one of these warnings
appears, but get service help right
away. See Roadside Service 0343.
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 fans are running. If the engine
is overheating, the fans should be
running. If they are not, do not
continue to run the engine. Have the
vehicle serviced.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
254 VEHICLE CARE
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 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.
. Tows a trailer.
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 temperature overheat gauge 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 and have
the cooling system checked for proper
fill and function.
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 ”next in
this section.
Overheated Engine
Protection Operating Mode
This emergency operating mode
allows the vehicle to be driven to a
safe place in an emergency situation.
If an overheated engine condition
exists, an overheat protection mode,
which alternates firing groups of
cylinders, helps prevent engine

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
VEHICLE CARE 255
damage. In this mode, there is
significant loss in power and engine
performance.
The engine coolant temperature
warning light comes on in the
instrument cluster, to indicate the
vehicle has entered overheated engine
protection operating mode. The
temperature gauge also indicates an
overheat condition exists. Driving
extended distances and/or towing a
trailer in the overheat protection
mode should be avoided.
Power Steering Fluid
(LF3 and LFX with AWD)
The power steering fluid reservoir is
under the engine cover on the
passenger side toward the rear of the
engine compartment. SeeEngine
Compartment Overview 0240.
When to Check Power Steering
Fluid
It is not necessary to regularly check
power steering fluid unless you
suspect there is a leak in the system
or an unusual noise is heard. A fluid
loss in this system could indicate a
problem. Have the system inspected
and repaired.
How to Check Power Steering
Fluid
Check the level when the engine
is cool.
To check the power steering fluid:
1. Remove the engine cover. Refer toEngine Cover 0243.
2. Wipe the cap and the top of the reservoir clean.
3. Turn the cap counterclockwise and pull it straight up.
4. Wipe the dipstick with a clean rag.
5. Replace the cap and completely tighten it. 6. Remove the cap again and look
at the fluid level on the dipstick.
The fluid level should be
between MIN and MAX on the
dipstick.
What to Use
To determine what kind of fluid to
use, see Recommended Fluids and
Lubricants 0332. Always use the
proper fluid.
Power Steering Fluid (LFX
with FWD)
The vehicle has electric power steering
and does not use power steering fluid.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
VEHICLE CARE 265
Headlamp Wiring
An electrical overload may cause the
lamps to go on and off, or in some
cases to remain off. Have the
headlamp wiring checked right away if
the lamps go on and off or remain off.
Windshield Wipers
If the wiper motor overheats due to
heavy snow or ice, the windshield
wipers will stop until the motor cools
and will then restart.
Although the circuit is protected from
electrical overload, overload due to
heavy snow or ice may cause wiper
linkage damage. Always clear ice and
heavy snow from the windshield
before using the windshield wipers.
If the overload is caused by an
electrical problem and not snow or
ice, be sure to get it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are
protected from short circuits by a
combination of fuses and circuitbreakers. This greatly reduces the
chance of damage caused by electrical
problems.
{Danger
Fuses and circuit breakers are
marked with their ampere rating.
Do not exceed the
specified amperage rating when
replacing fuses and circuit breakers.
Use of an oversized fuse or circuit
breaker can result in a vehicle fire.
You and others could be seriously
injured or killed.
To check a fuse, look at the
silver-colored band inside the fuse.
If the band is broken or melted,
replace the fuse. Be sure to replace a
bad fuse with a new one of the
identical size and rating.
Fuses of the same amperage can be
temporarily borrowed from another
fuse location, if a fuse goes out.
Replace the fuse as soon as possible.
Engine Compartment Fuse
Block
To remove the fuse block cover,
squeeze the three retaining clips on
the cover and lift it straight up.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the covers
on any electrical component.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
INDEX 367
E
Electric Parking Brake . . . . . . . . . . . . . . 194
Electric Parking Brake Light . . . . . . . 133
Electrical Equipment, Add-On . . . . . 235
Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Fuses and Circuit Breakers . . . . . . . 265
Instrument Panel Fuse Block . . . . 268
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 248
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 131
Compartment Overview . . . . . . . . . . 240
Coolant Temperature Gauge . . . . . 128
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . . 136
Cooling System . . . . . . . . . . . . . . . . . . . 250
Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Drive Belt Routing . . . . . . . . . . . . . . . . 338
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Oil Life System . . . . . . . . . . . . . . . . . . . . 246 Engine (cont'd)
Oil Pressure Light . . . . . . . . . . . . . . . . . 137
Overheated Protection
Operating Mode . . . . . . . . . . . . . . . . . 254
Overheating . . . . . . . . . . . . . . . . . . . . . . . 253
Power Messages . . . . . . . . . . . . . . . . . . 146
Running While Parked . . . . . . . . . . . 191
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Engine Oil
Temperature Gauge . . . . . . . . . . . . . . . 127
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 160
Equipment, Towing . . . . . . . . . . . . . . . . . 234
Event Data Recorders . . . . . . . . . . . . . . 350
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 161
Extended Parking . . . . . . . . . . . . . . . . . . . 189
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 74
Exterior Lamp Controls . . . . . . . . . . . . 155
Exterior Lamps Off Reminder . . . . . . 156
Exterior Lighting Battery Saver . . . . 161
F
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filter,
Engine Air Cleaner . . . . . . . . . . . . . . . . 248
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 157
Flashers, Hazard Warning . . . . . . . . . . 158
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291 Flat Tire (cont'd)
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 319
Fluid Automatic Transmission . . . . . . . . . 247
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Power Steering . . . . . . . . . . . . . . . . . . . . 255
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 44
Forward Automatic Braking . . . . . . . . 219
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Front Seats Heated and Ventilated . . . . . . . . . . . . . 63
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Economy Driving . . . . . . . . . . . . . . . . . . . 25
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . . . . . . 229
Filling the Tank . . . . . . . . . . . . . . . . . . . 227
Foreign Countries . . . . . . . . . . . . . . . . . 227
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Low Fuel Warning Light . . . . . . . . . 138
Prohibited Fuels . . . . . . . . . . . . . . . . . . 227
Recommended . . . . . . . . . . . . . . . . . . . . 226
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
370 INDEX
Lumbar Adjustment (cont'd)Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 57
M
Magnetic Ride Control . . . . . . . . . . . . . 198
Maintenance
Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Maintenance and Care Additional . . . . . . . . . . . . . . . . . . . . . . . . . 329
Maintenance Schedule . . . . . . . . . . . . . 322
Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . . . . 332
Malfunction Indicator Lamp . . . . . . . 131
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . 193
Massage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Memory Features . . . . . . . . . . . . . . . . . . . . 11
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . 60
Messages Engine Power . . . . . . . . . . . . . . . . . . . . . 146
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . 146
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . 45
Automatic Dimming Rearview . . . . . 46
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Mirrors (cont'd)
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . 45
Mirrors, Interior Rearview . . . . . . . . . . . 46
Monitor System, Tire Pressure . . . . . 281
N
Navigation Connected Services . . . . . . . . . . . . . . . 360
Net, Convenience . . . . . . . . . . . . . . . . . . . 111
New Vehicle Break-In . . . . . . . . . . . . . . . 183
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Off-Road
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Engine Oil Life System . . . . . . . . . . . 246
Pressure Light . . . . . . . . . . . . . . . . . . . . . 137
Older Children, Restraints . . . . . . . . . . . 89
Online Owner Center . . . . . . . . . . . . . . . 342
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
OnStar Additional Information . . . . 354
OnStar Emergency . . . . . . . . . . . . . . . . . . 353
OnStar Overview . . . . . . . . . . . . . . . . . . . . 352
OnStar Security . . . . . . . . . . . . . . . . . . . . . 354
Operating Mode Overheated Engine Protection . . . 254 Outlets
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . . . . . . . 254
Overheating, Engine . . . . . . . . . . . . . . . . 253
P
Park Shifting Into . . . . . . . . . . . . . . . . . . . . . . 188
Shifting Out of . . . . . . . . . . . . . . . . . . . . 189
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Parking Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 260
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Over Things That Burn . . . . . . . . . . . 189
Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . 211
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Passenger Compartment Air
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Passenger Sensing System . . . . . . . . . . 82
Perchlorate Materials Requirements, California . . . . . . . . . 238
Personalization
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147