2021 CADILLAC XT6 heater

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
236 DRIVING AND OPERATING
starting the vehicle. An internal
thermostat in the plug end of the cord
will prevent engine heater operation
at temperatures above−18 °C (0 °F).
{Warning
Do not plug in the engine block
heater while the vehicle is parked in
a garage or under a carport.
Property damage or personal injury
may result. Always park the vehicle
in a clear open area away from
buildings or structures.
To Use the Engine Heater
1. Turn off the engine.
2. Remove the engine heater
connector cover by gently prying
with a flat-bladed tool at the
location of the notch along the top
edge of the cover.
3. Check the heater cord for damage.If it is damaged, do not use it. See
your dealer for a replacement.
Inspect the cord for damage yearly.
4. Plug the heater cord into theconnector in the front fascia.
5. Plug it into a normal, grounded 110-volt AC outlet.
{Warning
Improper use of the heater cord or
an extension cord can damage the
cord and may result in overheating
and fire.
.Plug the cord into a three-prong
electrical utility receptacle that is
protected by a ground fault
(Continued)

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
DRIVING AND OPERATING 237
Warning (Continued)
detection function. An
ungrounded outlet could cause
an electric shock.
.Use a weatherproof, heavy-duty,
15 amp-rated extension cord if
needed. Failure to use the
recommended extension cord in
good operating condition,
or using a damaged heater or
extension cord, could make it
overheat and cause a fire,
property damage, electric shock,
and injury.
.Do not operate the vehicle with
the heater cord permanently
attached to the vehicle. Possible
heater cord and thermostat
damage could occur.
.While in use, do not let the
heater cord touch vehicle parts
or sharp edges.
.Before starting the vehicle,
unplug the cord. Keep the cord
away from any moving parts.
6. Before starting the engine, be sure to unplug and store the cord. 7. Install the engine heater connector
cover.
The length of time the heater should
remain plugged in depends on several
factors. Ask a dealer in the area where
you will be parking the vehicle for the
best advice on this.
Retained Accessory
Power (RAP)
When the ignition is turned from on
to off, the following features (if
equipped) will continue to function
for up to 10 minutes, or until the
driver door is opened. These features
will also work when the ignition is in
RUN or ACC/ACCESSORY:
.Infotainment System
.Power Windows (during RAP this
functionality will be lost when any
door is opened)
.Sunroof (during RAP this
functionality will be lost when any
door is opened)
.Auxiliary Power Outlet
.Audio System
.OnStar System
Shifting Into Park
To shift into P (Park): 1. Hold the brake pedal down and set the parking brake. See Electric
Parking Brake 0246.
2. Press the button on top of the shift lever to shift into P (Park). See
Automatic Transmission 0240.
3. The P indicator on the shift lever will turn red when the vehicle is in
P (Park).
Leaving the Vehicle with the
Engine Running
{Warning
It can be dangerous to leave the
vehicle with the engine running.
It could overheat and catch fire.
It is dangerous to get out of the
vehicle if the vehicle is not in
P (Park) with the parking brake set.
The vehicle can roll.
Do not leave the vehicle when the
engine is running. If you have left
the engine running, the vehicle can
(Continued)

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
VEHICLE CARE 317
{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. SeeRecommended
Fluids and Lubricants 0389 and
Maintenance Schedule 0380.
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 0320.
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-14574701) -
2021 - CRC - 2/8/21
VEHICLE CARE 321
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 0308 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-14574701) -
2021 - CRC - 2/9/21
INDEX 421
Door (cont'd)Power Locks . . . . . . . . . . . . . . . . . . . . . . . . 18
Drive Belt Routing, Engine . . . . . . . . . 396
Drive Systems All-Wheel Drive . . . . . . . . . . . . . 245, 324
Driver Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Driver Assistance Systems . . . . . . . . . 263
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . . . . 124
Driver Mode Control . . . . . . . . . . . . . . . . 250
Driver Mode Control Light . . . . . . . . . 121
Driving Assistance Systems . . . . . . . . . . . . . . . 272
Better Fuel Economy . . . . . . . . . . . . . 218
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . . . . . 290
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Hill and Mountain Roads . . . . . . . . 226
If the Vehicle is Stuck . . . . . . . . . . . . 228
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Loss of Control . . . . . . . . . . . . . . . . . . . . 221
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Off-Road Recovery . . . . . . . . . . . . . . . . 221
Vehicle Load Limits . . . . . . . . . . . . . . 228
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 225
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 Dual Automatic Climate
Control System . . . . . . . . . . . . . . . . . . . . 208
E
Electric Brake Boost . . . . . . . . . . . . . . . . 246
Electric Parking Brake . . . . . . . . . . . . . . 246
Electric Parking Brake Light . . . . . . . 117
Electrical Equipment, Add-On . . . . . 301
Electrical System
Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Fuses and Circuit Breakers . . . . . . . 328
Instrument Panel Fuse Block . . . . 332
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 315
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 115
Compartment Overview . . . . . . . . . . 308
Coolant Temperature Gauge . . . . . 113
Coolant Temperature Warning Light . . . . . . . . . . . . . . . . . . . 121
Cooling System . . . . . . . . . . . . . . . . . . . 316
Drive Belt Routing . . . . . . . . . . . . . . . . 396 Engine (cont'd)
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Oil Life System . . . . . . . . . . . . . . . . . . . . 313
Oil Pressure Light . . . . . . . . . . . . . . . . . 122
Overheating . . . . . . . . . . . . . . . . . . . . . . . 320
Power Messages . . . . . . . . . . . . . . . . . . 130
Running While Parked . . . . . . . . . . . 239
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
Engine Air Filter Life System . . . . . . 314
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 144
Equipment, Towing . . . . . . . . . . . . . . . . . 297
Event Data Recorders . . . . . . . . . . . . . . 408
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 145
Extended Parking . . . . . . . . . . . . . . . . . . . 239
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 59
Exterior Lamp Controls . . . . . . . . . . . . 139
Exterior Lamps Off Reminder . . . . . . 141
Exterior Lighting Battery Saver . . . . 145
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 315
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 141
Flashers, Hazard Warning . . . . . . . . . . 142
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/9/21
422 INDEX
FluidAutomatic Transmission . . . . . . . . . 314
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 31
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Front Seats Heated and Ventilated . . . . . . . . . . . . 45
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Economy, Driving for Better . . . . . 218
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 289
Filling the Tank . . . . . . . . . . . . . . . . . . . 287
Foreign Countries . . . . . . . . . . . . . . . . . 287
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Low Fuel Warning Light . . . . . . . . . 122
Management, Active . . . . . . . . . . . . . . 238
Prohibited Fuels . . . . . . . . . . . . . . . . . . 287
Recommended . . . . . . . . . . . . . . . . . . . . 286
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 Fuses
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Fuses and Circuit Breakers . . . . . . . 328
Instrument Panel Fuse Block . . . . 332
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
G
Garage Door Opener . . . . . . . . . . . . . . . . 135
Programming . . . . . . . . . . . . . . . . . . . . . . 135
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . 326
Gauges
Engine Coolant Temperature . . . . 113
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Speedometer . . . . . . . . . . . . . . . . . . . . . . 112
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 112
Trip Odometer . . . . . . . . . . . . . . . . . . . . 112
Warning Lights andIndicators . . . . . . . . . . . . . . . . . . . . . . . . 108
General Information Service and Maintenance . . . . . . . . 379
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . 304
Global Positioning
System (GPS) . . . . . . . . . . . . . . . . . . . . . . 173
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
Guidance Problems with the Route . . . . . . . . . 174
H
Hazard Warning Flashers . . . . . . . . . . 142
HD Radio Technology . . . . . . . . . . . . . . 155
Head Restraints . . . . . . . . . . . . . . . . . . . . . . 40
Head-up Display . . . . . . . . . . . . . . . . . . . . 126
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 141
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . . . . . 141
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . 141
High-Beam On Light . . . . . . . . . . . . . . 123
High/Low Beam Changer . . . . . . . . . 141
Lamps On Reminder . . . . . . . . . . . . . . 123
Heated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Steering Wheel . . . . . . . . . . . . . . . . . . . . 101
Heated and Ventilated Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . 31
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Heating . . . . . . . . . . . . . . . . . . . . . . . . .208, 213