2023 CADILLAC XT4 heating

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
Vehicle Care 339
{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
Lubricants0429 and
Maintenance Schedule 0425.
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 0342.
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.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
340 Vehicle Care
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 surethe cooling system is cool
before this is done. See
Engine Overheating
0342.
The coolant surge tank is in
the engine compartment on
the driver side of the vehicle.
See Engine Compartment
Overview 0331.
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
(Continued)
Warning (Continued)
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 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.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
342 Vehicle Care
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
0123. 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
Assistance Program 0439. 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
(Continued)
Warning (Continued)
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.

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
356 Vehicle Care
Fuses Usage7 TRLR ST/TRN LT –Left Trailer
Stop/Turn Lamp
–
8 MSM –Memory
Seat Module –
Driver and
Passenger
9 –
10 SADS –
Semi-active
Damping System/
Spare
–
11 DC DC BAT 2 –
Direct Current to
Direct Current
Converter 2
12 REAR DEFOGGER –
Rear Window
Defogger Fuses Usage
13 OSRVM DEFOG –Outside Rear
View Mirrors
Defogger
14 –
15 PEPS –Passive
Entry Passive
Start Module
16 FRT WIPERS –
Front Wiper
17 PASS/PWR/ SEAT–
Passenger
Power Seat
–
18 L/GATE MTR/ Spare–Liftgate
Motor/Spare
19 DRVR/PWR/ SEAT–Driver
Power Seat/
Memory Seat
Module/Driver
Seat Massage
Control Fuses Usage
21 Sunroof –Power
Sunroof
–
22 –
23 –
26 TCM IGN –
Transmission
Control Module
Ignition
27 Miscellaneous 1 –
Inside Rear View
Mirror –Shifter
Interface Board
Module Run/
Crank –Central
Gateway Module
Run/Crank –
Heating
Ventilation and
Air Conditioning
Control Module
Run/Crank
ignition 3 –
Forward Collision
Alert Display

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
Vehicle Care 357
Fuses Usage28 Rear Wipers –
Rear Wiper
29 –
30 Miscellaneous 2 –
Fuel Tank Zone
Module Run/
Crank –Direct
Current to Direct
Current
Transformer
Run/Crank –
Electronic Brake
Control Module
Run/Crank –
Instrument Panel
Cluster Run/
Crank
32 RDCM 2/Spare –
Rear Drive
Control Module 1/
Spare
33 FRT 2/HTD ST/ Spare–Front
Heated Seat
Power 2/Spare Fuses Usage
34 HFCR MDL/LGM/ WNDW SW –
Handsfree
Closure Release
Module/Liftgate
Module/Driver
and Passenger
Window Switches
35 –
36 FTZM –Fuel
Tank Zone
Module
39 FRT ST MASGE –
Driver Seat
Massage/
Passenger Seat
Massage
–
40 –
41 –
43 HTD/STR/WHL/ Spare–Heated
Steering Wheel/
Spare
– Fuses Usage
44 FRT 1/HTD/VENT ST/RR HTD ST/
Spare–Front
Heated Seat
Power Feed 1/
Front Vented
Seats/Rear
Heated Seats/
Spare
–
46 ECM IGN –
Engine Control
Module Ignition
48 RDCM 1/Spare –
Rear Drive
Control Module 1/
Spare
–
49 HVAC BLOWR MTR–Heating
Ventilation and
Air Conditioning
Control Blower
Motor
50 Spare

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
Vehicle Care 363
Fuses UsageF25 DLC –Data Link
Connector
F26 –
F27 –
F28 –
F29 BCM 8 –Body
Control Module 8 –
Internal Driver/Fuel
Door Unlock Relay
Control Signal,
Internal Non-Driver
Door Lock Relay
Control Signal,
Internal All Door
Unlock Relay Control
Signal
F30 OVERHD CNSL –
Overhead Console
F31 STR/WHL/CNTRL –
Steering Wheel
Controls
F32 – Fuses Usage
F33 HVAC –Heating
Ventilation and Air
Conditioning Control
Module
F34 CGM –Central
Gateway Module
F35 HEATED SW –
Heated Seat Switch/
Hazard Switch
–
F36 Wireless Charger Module/USB
Charge Port
F37 APO FRT –Not Used
F38 OnStar
F39 Displays –Shifter
Interface Board/
Center Stack/Head
Up Display/
Instrument Panel
Cluster/HVAC
Display Fuses Usage
F40 OBS DET –Long
Range Radar Sensor/
Ultrasonic Park
Assist Module/
Camera Module/
External Object
Calculating Module/
Side Blind Zone Alert
Modules/Front
Camera Module

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
364 Vehicle Care
Fuses UsageF41 BCM 1 SS –Body
Control Module 1
(Stop/Start) –LED
Indicator Lighting
Control, Accessory
LED Control,
Run-Start LED
Control, Ambient
Lighting LED
Control 2, Liftgate
Latch Motor Control
Signal, Rear Wiper
Control Signal, High
Beam Lamp Control
(Direct Drive), Rear
Fog LED Lamp
Control Signal,
Windshield Washer
Pump Motor Control
Signal, Run/Crank
Relay Control Signal,
ECM/TCM ACC
Wakeup Control
Signal, Left Rear Turn
Control Signal, Rear
Wiper Wash Pump
Control Signal, Brake
Pedal Apply Signal Fuses Usage
F42 RDO –Radio
F43 APO CNSL –Console
Auxiliary Power
Outlet (Circuit
Breaker)
–
F44 Spare –
Relay Usage K1 –
K2 RAP/ACCY
–
Retained
Accessory Power
K3 Content Theft
–
Not Used
K4 –
K5 –Wheels and Tires
Tires
Every new GM vehicle has
high-quality tires made by a
leading tire manufacturer.
See the warranty manual
for information regarding
the tire warranty and
where to get service. For
additional information refer
to the tire manufacturer.
{Warning
.Poorly maintained and
improperly used tires
are dangerous.
.Overloading the tires
can cause overheating
as a result of too much
flexing. There could be
a blowout and a serious
crash. See Vehicle Load
Limits0242.
(Continued)

Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
372 Vehicle Care
Speed Rating:An
alphanumeric code
assigned to a tire indicating
the maximum speed at
which a tire can operate.
Traction
:The friction
between the tire and the
road surface. The amount
of grip provided.
Tread
:The portion of a
tire that comes into
contact with the road.
Treadwear Indicators
:
Narrow bands, sometimes
called wear bars, that show
across the tread of a tire
when only 1.6 mm (1/16 in)
of tread remains. See
When It Is Time for New
Tires 0382.
UTQGS (Uniform Tire
Quality Grading
Standards)
:A tire
information system that
provides consumers with
ratings for a tire's traction, temperature, and
treadwear. Ratings are
determined by tire
manufacturers using
government testing
procedures. The ratings
are molded into the
sidewall of the tire. See
Uniform Tire Quality
Grading
0385.
Vehicle Capacity Weight
:
The number of designated
seating positions multiplied
by 68 kg (150 lbs) plus the
rated cargo load. See
Vehicle Load Limits 0242.
Vehicle Maximum Load on
the Tire
:Load on an
individual tire due to curb
weight, accessory weight,
occupant weight, and cargo
weight.
Vehicle Placard
:A label
permanently attached to a
vehicle showing the
vehicle's capacity weight and the original equipment
tire size and recommended
inflation pressure. See
“Tire
and Loading Information
Label” under Vehicle Load
Limits 0242.
Tire Pressure
Tires need the correct
amount of air pressure to
operate effectively.
{Warning
Neither tire underinflation
nor overinflation is good.
Underinflated tires,
or tires that do not have
enough air, can result in:
.Tire overloading and
overheating, which
could lead to a blowout
.Premature or
irregular wear
.Poor handling
(Continued)