climate control CADILLAC CT4 2023 User Guide

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Climate Controls 225
Climate Controls
Climate Control Systems
Dual Automatic ClimateControl System . . . . . . . . . . . 225
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . 230
Maintenance
Passenger CompartmentAir Filter . . . . . . . . . . . . . . . . . . . . . 231
Service . . . . . . . . . . . . . . . . . . . . . . . . 231
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 system. Center
Stack Climate Controls
1. ON/OFF (Power)
2. AUTO (Automatic
Operation)
3. Air Delivery Mode Control
4. Driver Temperature Controls 5. Fan Control
6. Passenger Temperature
Controls
7. A/C (Air Conditioning)
8. Recirculation

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
226 Climate Controls
9. SYNC (SynchronizedTemperature)
10. Defrost
11. Rear Window Defogger
Climate Control Display
1. Driver and Passenger Temperature Displays
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 speed, air delivery
mode, air conditioning, driver
and passenger temperatures,
recirculation, and Sync
settings can be controlled by
touching CLIMATE icon on the
infotainment Home Page or
the climate button in the
application tray. A selection
can then be made on the front
climate control page displayed.
See the infotainment manual.
Climate Control Status Display
The climate control status
display appears briefly when
the center stack climate
controls are adjusted.
Climate Control Influence
on Fuel Economy
The climate control system
depends on other vehicle
systems for heat and power
input. Certain climate control
settings can lead to higher
fuel usage.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Climate Controls 227
The following climate control
settings use more fuel:
.MAX air conditioning mode
.Defrost mode
.Extreme temperature
settings, such as 15° C
(60° F) or 32° C (90° F)
.High fan speed settings
To help reduce fuel usage:
.Use the full automatic
control as described under
“Automatic Operation.”
.Select a temperature setting
that is higher in hot weather
and lower in cold weather.
.Turn off the air conditioning
when it is not needed.
.Only use defrost to clear the
windows.
Automatic Operation
The system automatically
controls the following four
functions to heat or cool the
vehicle to the desired
temperature:
.Fan Speed
.Air Delivery Mode
.Air Conditioning
.Recirculation
When the AUTO indicator light
is lit, all four functions are
operating automatically. Each
function can be manually set
and the selected setting will
be shown. This cancels full
automatic operation and the
AUTO indicator light turns off.
Functions that are not
manually set will continue to
be automatically controlled,
although the AUTO indicator
light will not be lit.
To place the system in
automatic mode: 1. Press AUTO.
2. Set the driver and passenger temperature.
To find your comfort
setting, start with 22 °C
(72 °F) and allow the
system time to stabilize.
Then 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.
The recirculation light will not
come on when automatically
controlled. Press
@to
manually select recirculation;
press it again to select
outside air.
Do not cover the solar sensor
on the top of the instrument
panel near the windshield.
This sensor regulates air
temperature based on sun
load. See “Sensors” later in
this section.
Manual Operation
On/Off : Press to turn the
climate control system on or
off. When the system is off,
outside air will be prevented
from entering the vehicle.
When the system is on or a
button is pressed, the climate

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
228 Climate Controls
control system will turn on and
deliver airflow per the current
setting.
9:Press button up or down
to increase or decrease the
fan speed.
Press AUTO to return to
automatic operation.
Driver and Passenger
Temperature Control : The
temperature can be adjusted
separately for the driver and
passenger.
Press button up or down to
increase or decrease the
driver or passenger
temperature setting.
The driver side or passenger
side temperature display
shows the temperature
setting increasing or
decreasing.
SYNC : Press to link the
passenger and rear climate
temperature settings,
if equipped, to the driver
setting. The SYNC indicator
light will turn on. When the passenger or rear climate
temperature settings are
adjusted, the SYNC indicator
light is off.
Air Delivery Mode Control :
Press
Y,[, orzto change
the direction of the airflow. An
indicator light comes on in the
selected mode button. Multiple
buttons can be selected
simultaneously.
Changing the mode cancels
the automatic operation and
the system goes into manual
mode. Press AUTO to return
to automatic operation.
z: This mode clears the
windows of fog or moisture.
Air is directed to the
windshield and side window
vents. The system
automatically forces outside
air into the vehicle and the air
conditioning compressor will
run, unless the outside
temperature is close to
freezing.
Y: Air is directed to the
instrument panel outlets.
[: Air is directed to the floor
outlets, with some to the
windshield, side window
outlets, outboard panel
outlets, and second row floor
outlets.
0: Press to clear the
windshield of fog or frost
more quickly. Air is directed to
the windshield and the side
window outlets. The air
conditioning compressor also
comes on, unless the outside
temperature is below freezing.
Do not drive the vehicle until
all windows are clear.
See Air Vents 0230.
A/C : Press to turn the air
conditioning system on or off.
An indicator light comes on to
show that the air conditioning
is enabled. If the fan is turned
off, the air conditioner will not
run. The A/C light will stay on

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Climate Controls 229
even if the outside
temperatures are below
freezing.
@:Press to turn on
recirculation. An indicator light
comes on. Air is recirculated to
quickly cool the inside of the
vehicle. It can also be used to
help reduce outside air and
odors that enter the vehicle.
The air conditioning
compressor also comes on
when this mode is activated.
Rear Window Defogger
The rear window defogger
uses a warming grid to remove
fog from the rear window.
K: Press to turn the rear
window defogger on or off. An
indicator light on the button
comes on to show that the
rear window defogger is on.
The rear window defogger
only works when the vehicle is
on. The defogger can be
turned off by turning the
vehicle off or to
accessory mode.
Caution
Using a razor blade or sharp
object to clear the inside
rear window can damage
the rear window defogger.
Repairs would not be
covered by the vehicle
warranty. Do not clear the
inside rear window with
sharp objects.
Heated Mirror : If equipped
with heated outside mirrors,
the mirrors heat to help clear
fog or frost from the surface
of the mirror when the rear
window defog button is
pressed. See Heated Mirrors
0 30.
Remote Start Climate
Control Operation :
If equipped with remote start,
the climate control system
may run when the vehicle is
started remotely. The rear
defog may come on during
remote start based on cold ambient conditions. The rear
defog indicator light does not
come on during a remote start.
If equipped, the heated seats
will turn on if it is cold outside
or the ventilated seats will
turn on if it is hot outside. The
heated and ventilated seat
indicator lights may not come
on during a remote start.
If equipped, the heated
steering wheel will come on in
a remote start if it is cold
outside. The heated steering
wheel indicator light may not
come on.
Ionizer :
If equipped with an
ionizer, this feature helps to
clean the air inside the vehicle
and remove contaminants
such as pollen, odors, and
dust. If the climate control
system is on and the ionizer is
enabled, the ionizer status
indicator will be lit on the
climate control display. To turn
the Ionizer off or on, select

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
230 Climate Controls
Settings > Climate and Air
Quality > Ionizer > Select ON
or OFF.
Sensors
The solar sensor, located in
the defrost grille in the middle
of the instrument panel,
monitors the solar heat. Do
not cover the solar sensor or
the system will not work
properly.
There is also an exterior
temperature sensor behind
the front grille. This sensor
reads the outside air
temperature and helpsmaintain the temperature
inside the vehicle. Any cover
on the front of the vehicle,
could cause a false reading in
the displayed temperature.
The climate control system
uses the information from
these sensors to maintain
comfort settings by adjusting
the outlet temperature, fan
speed, and air delivery mode.
The system may also supply
cooler air to the side of the
vehicle facing the sun. The
recirculation mode will also be
used as needed to maintain
cool outlet temperatures.
Afterblow Feature
If equipped, under certain
conditions, the fan may stay
on or may turn on and off
several times after you turn
off and lock the vehicle. This is
normal.
Air Vents
Adjustable air vents are in the
center and on the sides of the
instrument panel, and on the
rear of the center console
storage.
Move the slider knobs to
change the direction of or to
close off the airflow.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Climate Controls 231
Operation Tips
.Clear away any ice, snow,
or leaves from air inlets at
the base of the windshield
that could block the flow of
air into the vehicle.
.Clear snow off the hood to
improve visibility and help
decrease moisture drawn
into the vehicle.
.Keep the path under the
front seats clear of objects
to help circulate the air
inside of the vehicle more
effectively.
.Use of non-GM approved
hood deflectors can
adversely affect the
performance of the system.
Check with your dealer
before adding equipment to
the outside of the vehicle.
.Do not attach any devices to
the air vent slats. This
restricts airflow and may
cause damage to the air
vents.
Maintenance
Passenger
Compartment Air
Filter
The filter reduces dust, pollen,
and other airborne irritants
from outside air that is pulled
into the vehicle. The filter
should be replaced as part of
routine scheduled
maintenance. See
Maintenance Schedule0469.
See your dealer regarding
replacement of the filter.
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 Schedule
0
469.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
234 Driving and Operating
Driving
Information
Driving for Better
Fuel Economy
Driving habits can affect fuel
mileage. Here are some driving
tips to get the best fuel
economy possible:
.Set the climate controls to
the desired temperature
after the engine is started,
or turn them off when not
required.
.Avoid fast starts and
accelerate smoothly.
.Brake gradually and avoid
abrupt stops.
.Avoid idling the engine for
long periods of time.
.When road and weather
conditions are appropriate,
use cruise control.
.Always follow posted speed
limits or drive more slowly
when conditions require.
.Keep vehicle tires properly
inflated.
.Combine several trips into a
single trip.
.Replace the vehicle's tires
with the same TPC Spec
number molded into the
tire's sidewall near the size.
.Follow recommended
scheduled maintenance.
Distracted Driving
Distraction comes in many
forms and can take your focus
from the task of driving.
Exercise good judgment and
do not let other activities
divert your attention away
from the road. Many local
governments have enacted
laws regarding driver
distraction. Become familiar
with the local laws in
your area.
To avoid distracted driving,
keep your eyes on the road,
keep your hands on the
steering wheel, and focus your
attention on driving.
.Do not use a phone in
demanding driving situations.
Use a hands-free method to
place or receive necessary
phone calls.
.Watch the road. Do not read,
take notes, or look up
information on phones or
other electronic devices.
.Designate a front seat
passenger to handle
potential distractions.
.Become familiar with vehicle
features before driving, such
as programming favorite
radio stations and adjusting
climate control and seat
settings. Program all trip
information into any
navigation device prior to
driving.
.Wait until the vehicle is
parked to retrieve items that
have fallen to the floor.
.Stop or park the vehicle to
tend to children.
.Keep pets in an appropriate
carrier or restraint.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
254 Driving and Operating
are clear. Avoid sudden
steering maneuvers and
braking while on ice.
.Turn off cruise control.
.Select All-Wheel Drive (AWD)
Mode for vehicles equipped
with AWD. Select Snow/Ice
Mode for FWD only vehicles.
See Driver Mode Control
0292 and
All-Wheel Drive 0286.
Cold Weather Mode
In very low temperatures, a
cold weather message may
display on the Driver
Information Center (DIC). The
engine speed, transmission
shift patterns, and cabin fan
speed may operate differently
to enable the vehicle to warm
up quicker. You can manually
override the cabin fan speed in
cold weather mode.
Blizzard Conditions
Stop the vehicle in a safe
place and signal for help. Stay
with the vehicle unless there is
help nearby. If possible, use Roadside Assistance. See
Roadside Assistance Program
0
487. To get help and keep
everyone in the vehicle safe:
.Turn on the hazard warning
flashers.
.Tie a red cloth to an outside
mirror.
{Warning
Snow can trap engine
exhaust under the vehicle.
This may cause exhaust
gases to get inside. Engine
exhaust contains carbon
monoxide (CO), which cannot
be seen or smelled. It can
cause unconsciousness and
even death.
If the vehicle is stuck
in snow:
.Clear snow from the base
of the vehicle, especially
any blocking the
exhaust pipe.
(Continued)
Warning (Continued)
.Open a window about
5 cm (2 in) on the vehicle
side that is away from the
wind, to bring in fresh air.
.Fully open the air outlets
on or under the
instrument panel.
.Adjust the climate control
system to circulate the air
inside the vehicle and set
the fan speed to the
highest setting. See
“Climate Control Systems.”
For more information about
CO, see Engine Exhaust
0 271.
To save fuel, run the engine
for short periods to warm the
vehicle and then shut the
engine off and partially close
the window. Moving about to
keep warm also helps.
If it takes time for help to
arrive, when running the
engine, push the accelerator
pedal slightly so the engine

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
Driving and Operating 265
{Warning
The automatic engine Stop/
Start feature causes the
engine to shut off while the
vehicle is still on. Do not exit
the vehicle before shifting to
P (Park). The vehicle may
restart and move
unexpectedly. Always shift
to P (Park), and then turn
the ignition off before
exiting the vehicle.
Auto Engine Stop/Start
When the brakes are applied
and the vehicle is at a
complete stop, the engine may
turn off. When stopped, the
tachometer displays AUTO
STOP. See Tachometer 0113.
When the brake pedal is
released or the accelerator
pedal is pressed, the engine
will restart. To maintain vehicle
performance, other conditions
may cause the engine to
automatically restart before
the brake pedal is released.
Auto Stops may not occur
and/or Auto Starts may occur
because:
.The climate control settings
require the engine to be
running to cool or heat the
vehicle interior.
.The vehicle battery needs to
charge.
.The vehicle battery has
recently been disconnected.
.Minimum vehicle speed has
not been reached since the
last Auto Stop.
.The accelerator pedal is
pressed.
.The engine or transmission
is not at the required
operating temperature.
.The outside temperature is
not in the required operating
range.
.The vehicle transmission is
shifted out of D (Drive) to
any gear other than P (Park).
.Certain driver modes have
been selected. See Driver
Mode Control
0292.
.The vehicle is on a steep hill
or grade.
.The driver door has been
opened or the driver seat
belt has been unbuckled.
.The hood has been opened.
.The Auto Stop has reached
the maximum allowed time.
Auto Stop Disable Switch