engine overheat CADILLAC XT6 2022 User Guide

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
VEHICLE CARE 331
{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 are filled with DEX-COOL
engine coolant mixture. This coolant
needs to be checked and changed at
appropriate levels. SeeRecommended
Fluids and Lubricants 0404 and
Maintenance Schedule 0395.
The following explains the cooling
systems and how to check and add
coolant when it is low. If there is a
problem with engine overheating, see
Engine Overheating 0334.
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.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
332 VEHICLE CARE
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. SeeEngine Overheating 0334.
The coolant surge tank is located in
the engine compartment on the driver
side of the vehicle. See Engine
Compartment Overview 0322.
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.
Coolant Fill Instructions (3.6L
Engine Only)
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.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
334 VEHICLE CARE
7. At the same time, press theaccelerator 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 Engine Control
Module (ECM) to go to sleep, about
two minutes, and repeat steps 3-7.
Listen for pump activation and
movement of the control valves while
watching the level of the 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 0113. 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 0416.
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 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:

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
VEHICLE CARE 335
1. Turn the air conditioning off.
2. Turn the heater on to the highesttemperature 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 0322 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.
.Do not mix water with
ready-to-use washer fluid. Water
can cause the solution to freeze
and damage the washer fluid
tank and other parts of the
washer system.
.When using concentrated washer
fluid, follow the manufacturer
instructions for adding water.
.Fill the washer fluid tank only
three-quarters full when it is very
cold. This allows for fluid
expansion if freezing occurs,
which could damage the tank if
it is completely full.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
342 VEHICLE CARE
Replacing a Blown Fuse
1. Turn off the vehicle.
2. Locate the fuse puller in the enginecompartment fuse block.
3. Use the fuse puller to remove thefuse from the top or side, as shown
above. 4. If the fuse must be replaced
immediately, borrow a replacement
fuse with the same amperage from
the fuse block. Choose a vehicle
feature that is not needed to safely
operate the vehicle. Repeat
Steps 2-3.
5. Insert the replacement fuse into the empty slot of the blown fuse.
At the next opportunity, see your
dealer to replace the blown fuse.
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

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
INDEX 437
Door (cont'd)Delayed Locking . . . . . . . . . . . . . . . . . . . 18
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . 18
Drive Belt Routing, Engine . . . . . . . . . 411
Drive Systems All-Wheel Drive . . . . . . . . . . . . . . . . . . . 244
Driver Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Driver Assistance Systems . . . . . . . . . 276
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . . . . 124
Driver Mode Control . . . . . . . . . . . . . . . . 248
Driver Mode Control Light . . . . . . . . . 121
Driving Assistance Systems . . . . . . . . . . . . . . . 287
Better Fuel Economy . . . . . . . . . . . . . 216
Characteristics and
Towing Tips . . . . . . . . . . . . . . . . . . . . . 305
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Hill and Mountain Roads . . . . . . . . 224
If the Vehicle is Stuck . . . . . . . . . . . . 226
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Loss of Control . . . . . . . . . . . . . . . . . . . . 219
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Off-Road Recovery . . . . . . . . . . . . . . . . 219
Vehicle Load Limits . . . . . . . . . . . . . . 226
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 223 Driving (cont'd)
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . . . . . 206
E
Electric Brake Boost . . . . . . . . . . . . . . . . 244
Electric Parking Brake . . . . . . . . . . . . . . 245
Electric Parking Brake Light . . . . . . . 118
Electrical Equipment, Add-On . . . . . 316
Electrical SystemEngine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Fuses and Circuit Breakers . . . . . . . 343
Instrument Panel Fuse Block . . . . 347
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 329
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 115
Compartment Overview . . . . . . . . . . 322
Coolant Temperature Gauge . . . . . 113
Cooling System . . . . . . . . . . . . . . . . . . . 330
Drive Belt Routing . . . . . . . . . . . . . . . . 411 Engine (cont'd)
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Oil Life System . . . . . . . . . . . . . . . . . . . . 327
Oil Pressure Light . . . . . . . . . . . . . . . . . 122
Overheating . . . . . . . . . . . . . . . . . . . . . . . 334
Power Messages . . . . . . . . . . . . . . . . . . 130
Running While Parked . . . . . . . . . . . 238
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Engine Air Filter Life System . . . . . . 328
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 144
Equipment, Towing . . . . . . . . . . . . . . . . . 312
Event Data Recorders . . . . . . . . . . . . . . 423
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 145
Extended Parking . . . . . . . . . . . . . . . . . . . 237
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 60
Exterior Lamp Controls . . . . . . . . . . . . 139
Exterior Lamps Off Reminder . . . . . . 141
Exterior Lighting Battery Saver . . . . 145
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 329
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 141
Flashers, Hazard Warning . . . . . . . . . . 142
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 392

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-15218998) -
2022 - CRC - 10/22/21
INDEX 441
Online Owner Center . . . . . . . . . . . . . . . 415
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
OnStar Additional Information . . . . 427
OnStar Emergency . . . . . . . . . . . . . . . . . . 426
OnStar Overview . . . . . . . . . . . . . . . . . . . . 425
OnStar Security . . . . . . . . . . . . . . . . . . . . . 426
OnStar System . . . . . . . . . . . . . . . . . . . . . . 171
OutletsPower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Overheating, Engine . . . . . . . . . . . . . . . . 334
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Instrument Panel . . . . . . . . . . . . . . . . . . . . 4
P
ParkShifting Into . . . . . . . . . . . . . . . . . . . . . . 236
Shifting Out of . . . . . . . . . . . . . . . . . . . . 236
Park Assist . . . . . . . . . . . . . . . . . . . . .278, 281
Parking Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 338
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Over Things That Burn . . . . . . . . . . . 237
Parking Assist Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 282
Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . 278 Passenger Airbag Status
Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Passenger Sensing System . . . . . . . . . . 67
Pedestrian Ahead Indicator . . . . . . . . 120
Perchlorate Materials Requirements, California . . . . . . . . . 319
Performance Shifting Light . . . . . . . . 119
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Phone Apple CarPlay andAndroid Auto . . . . . . . . . . . . . . . . . . . . 184
Bluetooth . . . . . . . . . . . . . . . . . . . . 179, 180
Port
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Positioning Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Protection, Battery . . . . . . . . . . . . . . . . 145
Retained Accessory (RAP) . . . . . . . . 236
Seat Adjustment . . . . . . . . . . . . . . . . . . . 41
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Pregnancy, Using Seat Belts . . . . . . . . . 59 Privacy
Vehicle Data Recording . . . . . . . . . . 423
Problems with Route Guidance . . . . 172
Program Courtesy Transportation . . . . . . . . . 418
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . 302
Proposition 65 Warning, California . . . . . . . . . . . . . . . . . . . . .337, 379, Back Cover
Publication Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 421
R
Radio
HD Radio Technology . . . . . . . . . . . . 154
Radio Data System (RDS) . . . . . . . . . . 155
Radio Frequency Statement . . . . . . . . 421
Radio Reception . . . . . . . . . . . . . . . . . . . . 156
Radios AM-FM Radio . . . . . . . . . . . . . . . . . . . . . 152
Satellite . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Reading Lamps . . . . . . . . . . . . . . . . . . . . . 144
Rear Camera Mirror . . . . . . . . . . . . . . . . . 32
Rear Climate Control System . . . . . . 211
Rear Cross Traffic Alert System . . . 287
Rear Pedestrian Alert . . . . . . . . . . . . . . . 286
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50