2021 CADILLAC CT4 coolant temperature

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
INSTRUMENTS AND CONTROLS 109
Brake Pad Life :If equipped, This
displays an estimate of the remaining
life of the front and rear brake pads.
Messages will display based on brake
pad wear and the state of the system.
Reset the Brake Pad Life display after
replacing the brake pads. See Brake
Pad Life System (If Equipped) 0324.
Tire Pressure : Shows the
approximate pressures of all four tires.
Tire pressure is displayed in either
kilopascal (kPa) or in pounds per
square inch (psi). If the pressure is
low, the value for that tire is shown in
amber. See Tire Pressure Monitor
System 0348 and
Tire Pressure Monitor Operation 0349.
Fuel Economy : Displays average fuel
economy, the best fuel economy over
the selected distance, and a bar graph
showing instantaneous fuel economy.
Average Speed : Displays the average
vehicle speed of the vehicle in
kilometers per hour (km/h) or miles
per hour (mph). This average is based
on the various vehicle speeds recorded
since the last reset. Reset the average
speed by pressing the thumbwheel while this display is active to show a
confirmation window to select yes
or no.
Timer :
This display can be used as a
timer. To start the timer, press the
thumbwheel while this display is
active. The display will show the
amount of time that has passed since
the timer was last reset. To stop the
timer, press the thumbwheel briefly
while this display is active and the
timer is running.
Press the thumbwheel while this
display is active to reset the timer.
Follow Distance/Gap Setting : When
Adaptive Cruise Control (ACC) is not
engaged, the current follow time to
the vehicle ahead is displayed as a
time value on this page. When ACC
has been engaged, the display
switches to the gap setting page. This
page shows the current gap setting
along with the vehicle ahead telltale.
Driver Assistance : If equipped,
shows information for Lane Keep
Assist (LKA) and Forward Collision
Alert (FCA). Battery Voltage :
Shows the current
battery voltage.
Coolant Temperature : Shows the
engine coolant temperature in either
degrees Celsius (°C) or degrees
Fahrenheit (°F).
Oil Temperature : Shows the engine
oil temperature in either degrees
Celsius (°C) or degrees Fahrenheit (°F).
Engine Hours (Hourmeter) : Shows
the total number of hours the engine
has run. The display also shows the
engine idle hours.
Engine Boost : Displays engine
manifold pressure relative to ambient
air pressure. It will display boost
pressure generated by the
turbocharging system.
Transmission Fluid Temperature :
Shows the temperature of the
automatic transmission fluid in either
degrees Celsius (°C) or degrees
Fahrenheit (°F).
Info Page Options : Scroll to choose
which info pages appear on the DIC.
Press the thumbwheel to select or
deselect.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
110 INSTRUMENTS AND CONTROLS
Blank Page :Allows for no
information to be displayed in the
cluster info display areas.
Driver Information Center
(DIC) (Uplevel)
The DIC is displayed in the
instrument cluster. It shows the status
of many vehicle systems.
DIC information is broken down into
two main zones:
Zone 1 : Displays on the instrument
cluster to the left of the speedometer.
Zone 2 : Displays on the instrument
cluster to the right of the
speedometer.
SorT: Press to move left or right
between the interactive display zones
in the cluster. Press the thumbwheel
to select.
yorz: Use the thumbwheel to
scroll up or down in a list. Press the
thumbwheel to select.
DIC Info Tiles Selection
The following is the list of all possible
DIC Info Tiles. Depending on the
vehicle, some may not be available. Zone 1
Battery Voltage :
Displays the current
battery voltage. The battery voltage
can fluctuate while viewing this
information on the DIC. This is
normal.
Coolant Temperature : Displays the
coolant temperature in either degrees
Celsius (°C) or degrees Fahrenheit (°F).
Engine Boost : If equipped, displays
engine manifold pressure relative to
ambient air pressure. It will display
boost pressure generated by the
turbocharging system.
Instantaneous Fuel Economy :
Displays the current fuel economy in
liters per 100 kilometers (L/100 km) or
miles per gallon (mpg). This number
reflects only the approximate fuel
economy that the vehicle has right
now and changes frequently as driving
conditions change. This display
cannot be reset.
Oil Pressure : Shows the current oil
pressure in either kilopascal (kPa) or
in pounds per square inch (psi).

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 12/4/20
300 DRIVING AND OPERATING
When towing at higher altitudes,
engine coolant will boil at a lower
temperature than at lower altitudes.
If the engine is turned off immediately
after towing at high altitude on steep
uphill grades, the vehicle could show
signs similar to engine overheating. To
avoid this, let the engine run,
preferably on level ground, with the
transmission in P (Park) for a few
minutes before turning the engine off.
If the overheat warning comes on, see
Engine Overheating0322.
Parking on Hills
{Warning
To prevent serious injury or death,
always park your vehicle and trailer
on a level surface when possible.
When parking your vehicle and your
trailer on a hill: 1. Press the brake pedal, but do not shift into P (Park) yet. Turn the
wheels into the curb if facing
downhill or into traffic if facing
uphill. 2. Have someone place chocks under
the trailer wheels.
3. When the wheel chocks are in place, gradually release the brake
pedal to allow the chocks to absorb
the load of the trailer.
4. Reapply the brake pedal. Then apply the parking brake and shift
into P (Park).
5. Release the brake pedal.
Leaving After Parking on a Hill
1. Apply and hold the brake pedal.
.Start the engine.
.Shift into a gear.
.Release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the chocks.
Maintenance when Trailer
Towing
The vehicle needs service more often
when used to tow trailers. See
Maintenance Schedule 0380. It is
especially important to check the automatic transmission fluid, engine
oil, axle lubricant, belts, cooling
system, and brake system before and
during each trip.
Check periodically that all nuts and
bolts on the trailer hitch are tight.
Engine Cooling when Trailer
Towing
The cooling system may temporarily
overheat during severe operating
conditions. See
Engine Overheating
0 322.
Trailer Towing (LSY 2.0L L4
Engine)
Caution
Towing a trailer improperly can
damage the vehicle and result in
costly repairs not covered by the
vehicle warranty. To tow a trailer
correctly, follow the directions in
this section and see your dealer for
important information about
towing a trailer with the vehicle.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
VEHICLE CARE 317
1. Remove the five screws on top ofthe air cleaner/filter cover.
2. Lift the air/cleaner/filter cover away from the air cleaner/filter housing.
3. Pull out the air cleaner/filter.
{Warning
If part replacement is necessary,
the part must be replaced with one
of the same part number or with an
equivalent part. Use of a
replacement part without the same
fit, form, and function may result in
personal injury or damage to the
vehicle.
4. Inspect or replace the air cleaner/ filter.
5. Reverse Steps 1–3 to reinstall the air cleaner/filter cover.
6. If equipped, reset the engine air filter life system after replacing the
engine air filter. See Engine Air
Filter Life System 0315.
{Warning
Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. Use caution
when working on the engine. Do
not start the engine or drive the
vehicle with the air cleaner/filter
off, as flames may be present if the
engine backfires.
Caution
If the air cleaner/filter is off, dirt
can easily get into the engine,
which could damage it. Always have
the air cleaner/filter in place when
driving.
Cooling System
The cooling system allows the engine
to maintain the correct working
temperature.
2.0L L4 Engine
1. Engine Coolant Surge Tank and
Pressure Cap
2. Engine Cooling Fan (Out of View)

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
318 VEHICLE CARE
2.7L L4 Engine
1. Engine Coolant Surge Tank andPressure Cap
2. Engine Cooling Fan (Out of View)
3. Cooling System Air Bleeder Cap
{Warning
An underhood electric fan can start
up even when the engine is not
running and can cause injury. Keep
hands, clothing, and tools away
from any underhood electric fan.
{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 cooling system in the vehicle is
filled with DEX-COOL engine coolant.
See Maintenance Schedule 0380 and
Recommended Fluids and Lubricants
0 391.
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 0322.
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.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
322 VEHICLE CARE
the pressure cap, refill to the indicated
line, replace the pressure cap, and
repeat steps 6.2–6.6.
The fill and air removal process will
run for approximately 15 minutes.
Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the cap
is properly and tightly secured.
Engine Overheating
The vehicle has an indicator to warn
of the engine overheating.
If the decision is made not to lift the
hood when this warning appears, get
service help right away. See Roadside
Service 0403.
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: 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 overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
vehicle distance from the vehicle in
front. If the warning does not come

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
VEHICLE CARE 323
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
Open the cap with the washer symbol
on it. Add washer fluid until the tank
is full. SeeEngine Compartment
Overview 0309 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.
(Continued)
Caution (Continued)
.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.
Brakes
Disc brake linings have built-in wear
indicators that make a high-pitched
warning sound when the brake linings
are worn and new linings are needed.
The sound can come and go or can be
heard all the time when the vehicle is
moving, except when applying the
brake pedal firmly.
{Warning
The brake wear warning sound
means that soon the brakes will not
work well. That could lead to a
crash. When the brake wear
warning sound is heard, have the
vehicle serviced.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-14584335) -
2021 - CRC - 11/23/20
INDEX 423
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . 358
ChargingWireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Charging System Light . . . . . . . . . . . . . . 97
Check Engine Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . . 97
Child Restraints Infants and Young Children . . . . . . . 60
Lower Anchors and Tethersfor Children . . . . . . . . . . . . . . . . . . . . . . . 65
Older Children . . . . . . . . . . . . . . . . . . . . . 59
Securing . . . . . . . . . . . . . . . . . . . . . . . . 72, 74
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . 331
Cleaning Exterior Care . . . . . . . . . . . . . . . . . . . . . . 370
Interior Care . . . . . . . . . . . . . . . . . . . . . . 375
Climate Control Systems Dual Automatic . . . . . . . . . . . . . . . . . . . 196
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Cluster, Instrument . . . . . . . . . . . . . . 88, 90
Collision Damage Repair . . . . . . . . . . . 406
Compartments Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Competitive Driving Mode . . . . . . . . . 246
Composite Materials . . . . . . . . . . . . . . . . 218 Compressor Kit, Tire Sealant . . . . . . . 360
Connected Services
Connections . . . . . . . . . . . . . . . . . . . . . . . 419
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 420
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . 418
Connections Connected Services . . . . . . . . . . . . . . . 419
Control Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Control of a Vehicle . . . . . . . . . . . . . . . . 204
Controls
Steering Wheel . . . . . . . . . . . . . . . . . . . . 137
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . 23
Coolant Engine Temperature Gauge . . . 94, 95
Engine Temperature Warning
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Cooling System . . . . . . . . . . . . . . . . . . . . . 317
Cornering Lamps . . . . . . . . . . . . . . . . . . . 130
Courtesy Lamps . . . . . . . . . . . . . . . . . . . . . 130
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405
Coverage Explanations . . . . . . . . . . . . . 163
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . 248
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Cruise Control, Adaptive . . . . . . . . . . . 251 Cruise Control, Super . . . . . . . . . . . . . . . 260
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Customer Assistance . . . . . . . . . . . . . . . 402
Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
Text Telephone (TTY) Users . . . . . 402
Customer Information Publications Ordering
Information . . . . . . . . . . . . . . . . . . . . . . 408
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 399
Cybersecurity . . . . . . . . . . . . . . . . . . . . . . . . 410
D
Damage Repair, Collision . . . . . . . . . . . 406
Danger, Warning, and Caution . . . . . . . . 2
Data Collection Infotainment System . . . . . . . . . . . . . 412
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
Data Recorders, Event . . . . . . . . . . . . . . 411
Database Coverage Explanations . . . . . . . . . . . . . . . . . . . . . . 163
Daytime Running Lamps (DRL) . . . 128
Defensive Driving . . . . . . . . . . . . . . . . . . . 204
Delayed Locking . . . . . . . . . . . . . . . . . . . . . 17
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Diagnostics Connected Services . . . . . . . . . . . . . . . 420
Differential, Limited-Slip . . . . . . . . . . . 248