engine overheat CADILLAC XT4 2021 User Guide

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
VEHICLE CARE 291
4. Inspect or replace the engine aircleaner/filter.
5. Reverse Steps 1–3 to reinstall the filter cover housing.
6. If equipped, reset the engine air filter life system after replacing the
engine air filter. See Engine Air
Filter Life System 0289.
{Warning
Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. Use caution
when working on the engine. Do
not start the engine or drive the
vehicle with the air cleaner/filter
off, as flames may be present if the
engine backfires.
Caution
If the air cleaner/filter is off, dirt
can easily get into the engine,
which could damage it. Always have
the air cleaner/filter in place when
driving.
Cooling System
The cooling system allows the engine
to maintain the correct working
temperature.
1. Electric Engine Cooling Fan (Out
of View)
2. Coolant Surge Tank and Pressure Cap
{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 engine cooling system in the
vehicle is filled with DEX-COOL engine
coolant mixture. This coolant needs to
be checked and changed at
appropriate levels. See Recommended
Fluids and Lubricants 0367 and
Maintenance Schedule 0358.
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 0294.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
292 VEHICLE CARE
What to Use
{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.
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. This mixture:
.Gives freezing protection down to
−37 °C (−34 °F), outside temperature.
.Gives boiling protection up to
129 °C (265 °F), engine temperature.
.Protects against rust and corrosion.
.Will not damage aluminum parts.
.Helps keep the proper engine
temperature.
Caution
Do not use anything other than a
mix of DEX-COOL coolant that
meets GM Standard GMW3420 and
clean, drinkable water. Anything
else can cause damage to the
engine cooling system and the
vehicle, which would not be covered
by the vehicle warranty.
Never dispose of engine coolant by
putting it in the trash, pouring it on
the ground, or pouring into sewers,
streams, or bodies of water. Have the
coolant changed by an authorized
service center, familiar with legal
requirements regarding used coolant
disposal. This will help protect the
environment and your health.
Checking Coolant
The vehicle must be on a level surface
when checking the coolant level.
Check to see if coolant is visible in the
coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, do not do anything else until
it cools down. If coolant is visible but
the coolant level mark is not at or
above the indicated mark, add a
50/50 mixture of clean, drinkable
water and DEX-COOL coolant. Be sure
the cooling system is cool before this
is done. See Engine Overheating 0294.
The coolant surge tank is in the
engine compartment on the driver
side of the vehicle. See Engine
Compartment Overview 0285.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
VEHICLE CARE 293
How to Add Coolant to the
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
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(Continued)
Caution (Continued)
cause system damage. If coolant is
not visible in the surge tank,
contact your dealer.
The coolant surge tank pressure cap
can be removed when the cooling
system, including the surge tank
pressure cap and upper radiator hose,
is no longer hot.
1. Turn the pressure cap slowly counterclockwise. If a hiss is heard,
wait for that to stop. A hiss means
there is still some pressure left.
2. Keep turning the pressure cap slowly and remove it.
3. If topping off the level in thecoolant surge tank, add the proper
mixture until the level reaches the
mark on the front of the tank and
replace the cap. Operate the
vehicle. Repeat steps 1–3, as
necessary.
If filling the system (such as after
servicing), follow the Automatic
Coolant Service Fill Instructions.
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.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
294 VEHICLE CARE
Automatic Coolant Service Fill
Instructions
This feature assists in filling and
removing air from the cooling system
after service of components or when
coolant is added after being too low.
To activate the fill and air removal
process:1. With a cold system, add coolant to the indicated mark on the
surge tank.
2. Replace the cap on the surge tank.
3. Connect the vehicle to a battery charger.
4. Turn the ignition to Service Mode. See Ignition Positions 0219.
5. Turn off the air conditioning.
6. Set the parking brake.
7. At the same time, press the accelerator and the brake for
automatic transmission vehicles for
two seconds, then release.
At the end of the cycle, check the
coolant level in the surge tank and
add coolant if it is low. Turn off the vehicle, allow the Electronic Control
Module (ECM) to go to sleep, about
2 minutes, and repeat Steps 3-7.
Listen for pump activation and
movement of the control valves while
watching the level of the coolant in
the surge tank. If the tank empties,
turn the ignition off, carefully remove
the surge tank cap, refill to the
indicated mark, and repeat Steps 3-6.
The fill and air removal process will
run for approximately 10 minutes.
Engine Overheating
The vehicle has several indicators to
warn of the engine overheating.
There is an engine coolant
temperature gauge on the instrument
cluster. See
Engine Coolant Temperature
Gauge 0103. The vehicle may also
display a message on the Driver
Information Center (DIC).
If the decision is made not to lift the
hood when this warning appears, get
service help right away. See Roadside
Service 0378. 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
(Continued)

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
VEHICLE CARE 295
Warning (Continued)
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.
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 engine coolant temperature
gauge is no longer in the overheated
area or the engine coolant
temperature warning light no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
distance from the vehicle in front.
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.
Washer Fluid
What to Use
When windshield washer fluid is
needed, be sure to read the
manufacturer's instructions before
use. If operating the vehicle in an area
where the temperature may fall below
freezing, use a fluid that has sufficient
protection against freezing.
Adding Washer Fluid
The appropriate message will appear
in the Driver Information Center (DIC)
when the fluid level is low.
Open the cap with the washer symbol
on it. Add washer fluid until the tank
is full. See
Engine Compartment
Overview 0285 for reservoir location.
Caution
.Do not use washer fluid that
contains any type of water
repellent coating. This can cause
the wiper blades to chatter
or skip.
.Do not use engine coolant
(antifreeze) in the windshield
washer. It can damage the
windshield washer system and
paint.
(Continued)

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
VEHICLE CARE 303
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 circuit
breakers. 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(CONTINUED)
Danger (Continued)
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.
{Warning
Installation or use of fuses that do
not meet GM’s original fuse
specifications is dangerous. The
fuses could fail, and result in a fire.
You or others could be injured or
killed, and the vehicle could be
damaged.
See Accessories and Modifications
0 283 and
General Information 0282. 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
The underhood fuse block is in the
engine compartment, on the driver
side of the vehicle.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
398 INDEX
Door (cont'd)Power Locks . . . . . . . . . . . . . . . . . . . . . . . . 18
Drive Belt Routing, Engine . . . . . . . . . 373
Drive Systems All-Wheel Drive . . . . . . . . . . . . . 232, 298
Driver Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Driver Assistance Systems . . . . . . . . . 248
Driver Behavior . . . . . . . . . . . . . . . . . . . . . 204
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . . . . 114
Driver Mode Control . . . . . . . . . . . . . . . . 236
Driver Mode Control Light . . . . . . . . . 111
Driving
Assistance Systems . . . . . . . . . . . . . . . 257
Better Fuel Economy . . . . . . . . . . . . . 205
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . . . . . 271
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Environment . . . . . . . . . . . . . . . . . . . . . . 204
Hill and Mountain Roads . . . . . . . . 213
If the Vehicle is Stuck . . . . . . . . . . . . 214
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Loss of Control . . . . . . . . . . . . . . . . . . . . 208
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Off-Road Recovery . . . . . . . . . . . . . . . . 207
Vehicle Load Limits . . . . . . . . . . . . . . 215
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 212 Driving (cont'd)
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Driving the Vehicle . . . . . . . . . . . . . . . . . . . . 2
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . . . . . 197
E
Electric Brake Boost . . . . . . . . . . . . . . . . 232
Electric Parking Brake . . . . . . . . . . . . . . 233
Electric Parking Brake Light . . . . . . . 107
Electrical Equipment, Add-On . . . . . 280
Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Fuses and Circuit Breakers . . . . . . . 303
Instrument Panel Fuse Block . . . . 306
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 290
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 105
Compartment Overview . . . . . . . . . . 285
Coolant Temperature Gauge . . . . . 103
Coolant Temperature Warning Light . . . . . . . . . . . . . . . . . . . 111
Cooling System . . . . . . . . . . . . . . . . . . . 291 Engine (cont'd)
Drive Belt Routing . . . . . . . . . . . . . . . . 373
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Oil Life System . . . . . . . . . . . . . . . . . . . . 288
Oil Pressure Light . . . . . . . . . . . . . . . . . 112
Overheating . . . . . . . . . . . . . . . . . . . . . . . 294
Power Messages . . . . . . . . . . . . . . . . . . 120
Running While Parked . . . . . . . . . . . 226
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Engine Air Filter Life System . . . . . . 289
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 134
Equipment, Towing . . . . . . . . . . . . . . . . . 277
Event Data Recorders . . . . . . . . . . . . . . 385
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 134
Extended Parking . . . . . . . . . . . . . . . . . . . 225
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 53
Exterior Lamp Controls . . . . . . . . . . . . 129
Exterior Lamps Off Reminder . . . . . . 131
Exterior Lighting Battery Saver . . . . 135
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 290
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 131
Flashers, Hazard Warning . . . . . . . . . . 132
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
402 INDEX
Online Owner Center . . . . . . . . . . . . . . . 377
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
OnStar Additional Information . . . . 388
OnStar Emergency . . . . . . . . . . . . . . . . . . 388
OnStar Overview . . . . . . . . . . . . . . . . . . . . 387
OnStar Security . . . . . . . . . . . . . . . . . . . . . 388
OnStar System . . . . . . . . . . . . . . . . .150, 162
OutletsPower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Overheating, Engine . . . . . . . . . . . . . . . . 294
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 Instrument Panel . . . . . . . . . . . . . . . . . . . . 4
P
ParkShifting Into . . . . . . . . . . . . . . . . . . . . . . 224
Shifting Out of . . . . . . . . . . . . . . . . . . . . 224
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Parking Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 298
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Over Things That Burn . . . . . . . . . . . 225
Parking or Backing Assistance Systems . . . . . . . . . . . . . . . 250
Passenger Airbag Status
Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Passenger Compartment Air
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Passenger Sensing System . . . . . . . . . . 60
Pedestrian Ahead Indicator . . . . . . . . 110
Perchlorate Materials Requirements, California . . . . . . . . . 282
Performance Shifting Light . . . . . . . . 109
Personalization
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Phone Apple CarPlay and
Android Auto . . . . . . . . . . . . . . . . . . . . 175
Bluetooth . . . . . . . . . . . . . . . . . . . . 170, 171
Port USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Positioning
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Protection, Battery . . . . . . . . . . . . . . . . 135
Retained Accessory (RAP) . . . . . . . . 224
Seat Adjustment . . . . . . . . . . . . . . . . . . . 38
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Pregnancy, Using Seat Belts . . . . . . . . . 52
Privacy Vehicle Data Recording . . . . . . . . . . 385 Problems with Route Guidance . . . . 163
Program
Courtesy Transportation . . . . . . . . . 380
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . 268
Proposition 65 Warning,
California . . . . . . . . . . . . . . .282, 297, 342, Back Cover
Publication Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 383
R
RadioHD Radio Technology . . . . . . . . . . . . 144
Radio Data System (RDS) . . . . . . . . . . 145
Radio Frequency Statement . . . . . . . . 383
Radio Reception . . . . . . . . . . . . . . . . . . . . 146
Radios AM-FM Radio . . . . . . . . . . . . . . . . . . . . . 142
Satellite . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Reading Lamps . . . . . . . . . . . . . . . . . . . . . 134
Rear Camera Mirror . . . . . . . . . . . . . . . . . 30
Rear Pedestrian Alert . . . . . . . . . . . . . . . 256
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Rear Storage . . . . . . . . . . . . . . . . . . . . . . . . . 85
Rear Vision Camera (RVC) . . . . . . . . . 250
Rear Window Washer/Wiper . . . . . . . . 94