Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
2 INTRODUCTION
Using this Manual
To quickly locate information about
the vehicle, use the Index in the back
of the manual. It is an alphabetical
list of what is in the manual and the
page number where it can be found.
About Driving the Vehicle
As with other vehicles of this type,
failure to operate this vehicle correctly
may result in loss of control or a
crash. Be sure to read the driving
guidelines in this manual in the
section called“Driving and Operating”
and specifically Driver Behavior0204,
Driving Environment 0204, and Vehicle
Design 0204.
Danger, Warning, and
Caution
Warning messages found on vehicle
labels and in this manual describe
hazards and what to do to avoid or
reduce them.
{Danger
Danger indicates a hazard with a
high level of risk which will result
in serious injury or death.
{Warning
Warning indicates a hazard that
could result in injury or death.
Caution
Caution indicates a hazard that
could result in property or vehicle
damage.
A circle with a slash through it is a
safety symbol which means “Do not,”
“Do not do this,” or“Do not let this
happen.”
Symbols
The vehicle has components and
labels that use symbols instead of
text. Symbols are shown along with
the text describing the operation or
information relating to a specific
component, control, message, gauge,
or indicator.
M: Shown when the owner’s manual
has additional instructions or
information.
*: Shown when the service manual
has additional instructions or
information.
0: Shown when there is more
information on another page —
“see page.”
Vehicle Symbol Chart
Here are some additional symbols that
may be found on the vehicle and what
they mean. See the features in this
manual for information.
u: Air Conditioning System
G:Air Conditioning Refrigerant Oil
9:Airbag Readiness Light
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
CLIMATE CONTROLS 197
Climate Controls
Climate Control Systems
Dual Automatic Climate ControlSystem . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Maintenance
Passenger Compartment AirFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Climate Control Systems
Dual Automatic Climate Control System
The climate control buttons on the center stack and on the climate control
display are used to adjust the heating, cooling, and ventilation.
1. ON/OFF
2. AUTO (Automatic Operation)
3. Air Delivery Mode Controls
4. Driver Temperature Control
5. Fan Control
6. Passenger Temperature Control 7. A/C (Air Conditioning)
8. Recirculation
9. SYNC (Synchronized Temperature)
10. Max Defrost
11. Rear Window Defogger
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
198 CLIMATE CONTROLS
Climate Control Display
1. Driver and Passenger TemperatureDisplays
2. Fan Control
3. Driver and Passenger Temperature Controls
4. Sync (Synchronized Temperature)
5. Recirculation
6. Air Delivery Mode Control
7. Auto (Automatic Operation)
8. A/C (Air Conditioning)
9. On/Off (Power) The fan, air delivery mode, air
conditioning, driver and passenger
temperatures, and Sync settings can
be controlled by touching CLIMATE
on the infotainment Home Page or the
CLIMATE button in the climate
control display application tray.
A selection can then be made on the
front climate control page displayed.
See
Settings 0177.
Climate Control Status Display
The climate control status display
appears briefly when the climate
controls are adjusted. Automatic Operation
The system automatically controls the
fan speed, air delivery, air
conditioning, and recirculation in
order to heat or cool the vehicle to the
desired temperature.
When AUTO is pressed, all four
functions operate automatically. Each
function can also be manually set and
the selected setting is displayed.
Functions not manually set will
continue to be automatically
controlled, even if the AUTO indicator
is not lit.
For automatic operation:
1. Press AUTO.
2. Set the temperature. Allow the system time to stabilize. Adjust the
temperature as needed for best
comfort.
To improve fuel efficiency and to cool
the vehicle faster, recirculation may be
automatically selected in warm
weather.
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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CLIMATE CONTROLS 199
The recirculation light will not come
on when automatically controlled. See
@under“Manual Operation ”for
more details.
During hands free calling the blower
level may automatically reduce. The
blower level can be manually adjusted
if desired.
Manual Operation
ON/OFF : Press to turn the system off
or on. When off is selected, the
system will prevent outside air from
entering the vehicle. If any climate
control buttons are pressed, the
system will turn on and operate at the
current setting.
Q^or^ R:Lift or press to increase
or decrease the fan speed. The fan
speed setting appears on the main
display. Lifting or pressing either
button cancels automatic fan control
and the fan is controlled manually.
Press AUTO to return to automatic
operation.
Q/R: The temperature can be
adjusted separately for the driver and
the passenger. Lift or press to increase
or decrease the temperature. SYNC :
Press to link the passenger
temperature settings to the driver
setting. The SYNC indicator light will
turn on. When the passenger settings
are adjusted, the SYNC indicator light
turns off.
Air Delivery Mode Controls : Press
z,Y, or[to change the direction
of the airflow. The indicator light in
the button will turn on. Any
combination of the three buttons can
be selected. The current mode appears
in the climate control display. Pressing
any of the three buttons cancels
automatic air delivery control and the
direction of the airflow is controlled
manually. Press AUTO to return to
automatic operation.
To change the current mode, select
one or more of the following:
z: Clears the windows of fog or
moisture. Air is directed to the
windshield.
Y: Air is directed to the instrument
panel outlets.
[: Air is directed to the floor
outlets.
0MAX : Air is directed to the
windshield and the fan runs at a
higher speed. Fog or frost is cleared
from the windshield more quickly.
When the button is pressed again, the
system returns to the previous mode
setting.
For best results, clear all snow and ice
from the windshield before defrosting.
A/C : Press to turn the air
conditioning system on or off. If the
climate control system is turned off or
the outside temperature falls below
freezing, the air conditioner will
not run.
Pressing this button cancels automatic
air conditioning and turns off the air
conditioner. Press AUTO to return to
automatic operation and the air
conditioner runs automatically as
needed. When the indicator light is
on, the air conditioner runs
automatically to cool the air inside
the vehicle or to dry the air needed to
defog the windshield faster.
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
202 CLIMATE CONTROLS
Service
All vehicles have a label underhood
that identifies the refrigerant used in
the vehicle. The refrigerant system
should only be serviced by trained and
certified technicians. The air
conditioning evaporator should never
be repaired or replaced by one from a
salvage vehicle. It should only be
replaced by a new evaporator to
ensure proper and safe operation.
During service, all refrigerants should
be reclaimed with proper equipment.
Venting refrigerants directly to the
atmosphere is harmful to the
environment and may also create
unsafe conditions based on inhalation,
combustion, frostbite, or other
health-based concerns.
The air conditioning system requires
periodic maintenance. See
Maintenance Schedule0358.
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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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 305
FusesUsage
7 Trailer stop/Turn LH
8 Memory seat module
9 Pedestrian friendly alert function
10 Semi-active damping system
11 DC DC Battery 1/2
12 Rear defogger
13 Heated mirror
14 –
15 Passive entry passive start
16 Front wiper
17 Passenger power seat
18 Power liftgate module
19 Driver power seat
21 Sunroof
22 Rear wiper
23 Trailer interface module 2 Fuses
Usage
26 Transmission control module/Ignition
27 Instrument panel body/ Ignition
28 Rear wiper
29 Trailer ignition
30 Malfunction indicator lamp start/stop Trailer
interface module ignition
32 Rear drive control module 1
33 –
34 Handsfree/Window switch
35 Diesel exhaust fuel heater
36 Fuel module
39 Massage
40 Steering column lock
41 –
43 Heated steering wheel Fuses
Usage
44 Seat ventilation/Front heated seat
46 Engine control module/ Ignition
48 Rear drive control module 2
49 Heating ventilation/Air conditioning blower
motor
50 –
51 –
54 –
55 –
56 Starter motor
57 –
58 –
59 High-beam headlamps left/right
60 Trailer interface module 1
61 –
62 –