heating CADILLAC CT5 2021 User Guide

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
VEHICLE CARE 323
{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.
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.
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL engine coolant.
SeeMaintenance Schedule 0383 and
Recommended Fluids and Lubricants
0 392. 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
0326.
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 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.
It is normal to see coolant moving in
the upper coolant hose return line
when the engine is running. It is also
normal to see bubbles entering the
surge tank through the small hose.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
326 VEHICLE CARE
3. Fill the surge tank with the propermixture to the indicated
level mark.
4. With the coolant surge tank pressure cap off, start the engine
and let it run until you can feel the
upper radiator hose getting hot.
Watch out for the engine
cooling fan.
By this time, the coolant level
inside the coolant surge tank may
be lower. If the level is lower, add
more of the proper mixture to the
surge tank until the level reaches
the indicated level mark.
5. Replace the pressure cap tightly. 6. Check the level in the surge tank
after the engine is shut off and the
cooling system has cooled down.
If the coolant is not at the proper
level, repeat Steps 1–6. If the
coolant still is not at the proper
level when the system cools down
again, see your dealer.
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 0405.
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.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
334 VEHICLE CARE
Bulb Replacement
LED Lighting
This vehicle has LED lamps. For
replacement of any LED lighting
assembly, contact your dealer.
Electrical System
Electrical System Overload
The vehicle has fuses and circuit
breakers to protect against an
electrical system overload.
When the electrical load is too heavy
a circuit breaker opens, protecting the
circuit until overcurrent condition is
removed. This greatly reduces the
chance of circuit overload and fire
caused by electrical problems.
Fuses and circuit breakers protect
electrical devices in the vehicle.Replace a blown or open fuse with a
new one of the identical size and
rating.
If there is a problem on the road and
a fuse needs to be replaced, the
same amperage fuse can be borrowed.
Choose some feature of the vehicle
that is not needed to use and replace
it as soon as possible.
Headlamp Wiring
An electrical overload may cause the
lamps to go on and off, or in some
cases to remain off. Have the
headlamp wiring checked right away if
the lamps go on and off or remain off.
Windshield Wipers
If the wiper motor overheats due to
heavy snow or ice, the windshield
wipers will stop. Wiper function is
available immediately after the wiper
switch is set to off, and back to on.To protect the wiper motor from
overheating, the wipers may slow
down when the windshield is dry for a
long period of time. If a period of dry
operation, or little moisture, exceeds
10 minutes, the wipers may switch to
intermittent operation, and remain
there. When moisture is again
detected on the windshield, wiper
operation will return to the operator
selected speed.
Although the circuit is protected from
electrical overload, overload due to
heavy snow or ice may cause wiper
linkage damage. Always clear ice and
heavy snow from the windshield
before using the windshield wipers.
If the overload is caused by an
electrical problem and not snow or
ice, be sure to get it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are
protected from short circuits by a
combination of fuses and circuit
breakers. This greatly reduces the
chance of damage caused by electrical
problems.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
342 VEHICLE CARE
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. SeeVehicle
Load Limits 0219.
.Underinflated tires pose the
same danger as overloaded
tires. The resulting crash
(Continued)
Warning (Continued)
could cause serious injury.
Check all tires frequently to
maintain the recommended
pressure. Tire pressure should
be checked when the tires
are cold.
.Overinflated tires are more
likely to be cut, punctured,
or broken by a sudden impact
— such as when hitting a
pothole. Keep tires at the
recommended pressure.
.Worn or old tires can cause a
crash. If the tread is badly
worn, replace them.
.Replace any tires that have
been damaged by impacts
with potholes, curbs, etc.
.Improperly repaired tires can
cause a crash. Only the dealer
or an authorized tire service
(Continued)
Warning (Continued)
center should repair, replace,
dismount, and mount the
tires.
.Do not spin the tires in
excess of 56 km/h (35 mph)
on slippery surfaces such as
snow, mud, ice, etc. Excessive
spinning may cause the tires
to explode.
See Tire Pressure for High-Speed
Operation 0350 for inflation
pressure adjustment for
high-speed driving.
All-Season Tires
This vehicle may come with all-season
tires. These tires are designed to
provide good overall performance on
most road surfaces and weather
conditions. Original equipment tires
designed to GM's specific tire
performance criteria have a TPC
specification code molded onto the
sidewall. Original equipment

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
VEHICLE CARE 349
treadwear. Ratings are determined
by tire manufacturers using
government testing procedures.
The ratings are molded into the
sidewall of the tire. SeeUniform
Tire Quality Grading 0359.
Vehicle Capacity Weight
:The
number of designated seating
positions multiplied by
68 kg (150 lb) plus the rated cargo
load. See Vehicle Load Limits 0219.
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 capacity
weight and the original equipment
tire size and recommended
inflation pressure. See “Tire and
Loading Information Label” under
Vehicle Load Limits 0219.
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.
.Reduced fuel economy.
Overinflated tires, or tires that
have too much air, can result in:
.Unusual wear.
.Poor handling.
.Rough ride.
.Needless damage from road
hazards. The Tire and Loading Information
label on the vehicle indicates the
original equipment tires and the
correct cold tire inflation
pressures. The recommended
pressure is the minimum air
pressure needed to support the
vehicle's maximum load carrying
capacity. See
Vehicle Load Limits
0 219.
How the vehicle is loaded affects
vehicle handling and ride comfort.
Never load the vehicle with more
weight than it was designed to
carry.
When to Check
Check the pressure of the tires
once a month or more.
How to Check
Use a good quality pocket-type
gauge to check tire pressure.
Proper tire inflation cannot be
determined by looking at the tire.
Check the tire inflation pressure
when the tires are cold, meaning

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
INDEX 425
DoorAjar Light . . . . . . . . . . . . . . . . . . . . . . . . . 113
Delayed Locking . . . . . . . . . . . . . . . . . . . 17
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . 17
Drive Belt Routing, Engine . . . . . . . . . 400
Drive Systems All-Wheel Drive . . . . . . . . . . . . . 237, 331
Driver Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Driver Assistance Systems . . . . . . . . . 275
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . .113, 116
Driver Mode Control . . . . . . . . . . . . . . . . 242
Driver Mode Control Light . . . . . . . . . 109
Driving Assistance Systems . . . . . . . . . . . . . . . 285
Better Fuel Economy . . . . . . . . . . . . . 209
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . . . . . 301
Competitive . . . . . . . . . . . . . . . . . . . . . . . 247
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Hill and Mountain Roads . . . . . . . . 217
If the Vehicle is Stuck . . . . . . . . . . . . 219
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Loss of Control . . . . . . . . . . . . . . . . . . . . 212
Off-Road Recovery . . . . . . . . . . . . . . . . 212 Driving (cont'd)
Track Events and
Competitive . . . . . . . . . . . . . . . . . . . . . . 213
Vehicle Load Limits . . . . . . . . . . . . . . 219
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 217
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Dual Automatic Climate
Control System . . . . . . . . . . . . . . . . . . . . 202
E
Electric Brake Boost . . . . . . . . . . . . . . . . 237
Electric Parking Brake . . . . . . . . . . . . . . 238
Electric Parking Brake Light . . . . . . . 106
Electrical Equipment, Add-On . . . . . 307
Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Fuses and Circuit Breakers . . . . . . . 334
Instrument Panel Fuse Block . . . . 337
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 320
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 103 Engine (cont'd)
Compartment Overview . . . . . . . . . . 313
Coolant Temperature
Gauge . . . . . . . . . . . . . . . . . . . . . . 100, 101
Coolant Temperature Warning Light . . . . . . . . . . . . . . . . . . . 109
Cooling System . . . . . . . . . . . . . . . . . . . 322
Drive Belt Routing . . . . . . . . . . . . . . . . 400
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Oil Life System . . . . . . . . . . . . . . . . . . . . 318
Oil Pressure Light . . . . . . . . . . . . . . . . . 110
Overheating . . . . . . . . . . . . . . . . . . . . . . . 326
Power Messages . . . . . . . . . . . . . . . . . . 123
Running While Parked . . . . . . . . . . . 231
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Engine Air Filter Life System . . . . . . 319
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 137
Equipment, Towing . . . . . . . . . . . . . . . . . 306
Event Data Recorders . . . . . . . . . . . . . . 412
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 138
Extended Parking . . . . . . . . . . . . . . . . . . . 230
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 53
Exterior Lamp Controls . . . . . . . . . . . . 132
Exterior Lamps Off Reminder . . . . . . 134
Exterior Lighting Battery Saver . . . . 139

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
INDEX 427
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . 28
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
High-Beam On Light . . . . . . . . . . . . . . . . 111
High-Speed Operation . . . . . . . . . . . . . . 350
Hill and Mountain Roads . . . . . . . . . . 217
Hill Start Assist (HSA) . . . . . . . . . . . . . 239
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
How to Wear Seat Belts Properly . . . 47
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
I
If the System Needs Service . . . . . . . 169
Ignition Positions . . . . . . . . . . . . . . . . . . . 224
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Indicator Pedestrian Ahead . . . . . . . . . . . . . . . . . 108
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . 108
Infants and Young Children, Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Information Publication Ordering . . . . . . . . . . . . . 410
Infotainment System . . . . . . . . . . . . . . . 413
Instrument Cluster . . . . . . . . . . . . . . 94, 96 Instrument Panel Overview . . . . . . . . . . . 4
Interior Rearview Mirrors . . . . . . . . . . . 29
Introduction . . . . . . . . . . . . . . . . . . . . . . 1, 140
J
Jump Starting - North America . . . . 368
K
Keyless Entry
Remote (RKE) System . . . . . . . . . . . . . . . 7
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
L
Labeling, Tire Sidewall . . . . . . . . . . . . . 345
Lamps Cornering . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Courtesy . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Daytime Running (DRL) . . . . . . . . . . 134
Dome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Exterior Controls . . . . . . . . . . . . . . . . . . 132
Exterior Lamps Off Reminder . . . . 134
Exterior Lighting BatterySaver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Malfunction Indicator (Check Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . 103
On Reminder . . . . . . . . . . . . . . . . . . . . . . 112
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Lane Change Alert (LCA) . . . . . . . . . . . 291
Lane Keep Assist (LKA) . . . . . . . . . . . . 293 Lane Keep Assist Light . . . . . . . . . . . . . 107
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . 49
LATCH System
Replacing Parts after a Crash . . . . . 78
LATCH, Lower Anchors and Tethers for Children . . . . . . . . . . . . . . . 72
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . 334
Light
Performance Shifting . . . . . . . . . . . . . 107
Lighting Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Illumination Control . . . . . . . . . . . . . . 136
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Lights Airbag Readiness . . . . . . . . . . . . . . . . . 102
Antilock Brake System (ABS)
Warning . . . . . . . . . . . . . . . . . . . . . . . . . 106
Automatic Vehicle Hold . . . . . . . . . . 107
Brake System Warning . . . . . . . . . . . 105
Charging System . . . . . . . . . . . . . . . . . . 103
Check Engine (Malfunction Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 103
Cruise Control . . . . . . . . . . . . . . . . . . . . . 112
Door Ajar . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Driver Mode Control . . . . . . . . . . . . . . 109
Electric Parking Brake . . . . . . . . . . . . 106

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-14584312) -
2021 - CRC - 11/23/20
INDEX 429
Off-RoadRecovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Engine Oil Life System . . . . . . . . . . . 318
Pressure Light . . . . . . . . . . . . . . . . . . . . . 110
Older Children, Restraints . . . . . . . . . . . 65
Online Owner Center . . . . . . . . . . . . . . . 404
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
OnStar Additional Information . . . . 415
OnStar Emergency . . . . . . . . . . . . . . . . . . 415
OnStar Overview . . . . . . . . . . . . . . . . . . . . 414
OnStar Security . . . . . . . . . . . . . . . . . . . . . 415
OnStar System . . . . . . . . . . . . . . . . .155, 166
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Overheating, Engine . . . . . . . . . . . . . . . . 326
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Instrument Panel . . . . . . . . . . . . . . . . . . . . 4
P
ParkShifting Into . . . . . . . . . . . . . . . . . . . . . . 229
Shifting Out of . . . . . . . . . . . . . . . . . . . . 229
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Parking Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 331 Parking (cont'd)
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Over Things That Burn . . . . . . . . . . . 230
Parking or Backing Assistance Systems . . . . . . . . . . . . . . . 277
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Passenger Sensing System . . . . . . . . . . 60
Pedestrian Ahead Indicator . . . . . . . . 108
Perchlorate Materials Requirements, California . . . . . . . . . 309
Performance Shifting Light . . . . . . . . 107
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Phone Apple CarPlay andAndroid Auto . . . . . . . . . . . . . . . . . . . . 180
Bluetooth . . . . . . . . . . . . . . . . . . . . 175, 176
Port
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Positioning Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 17
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Power (cont'd)
Protection, Battery . . . . . . . . . . . . . . . . 139
Retained Accessory (RAP) . . . . . . . . 229
Seat Adjustment . . . . . . . . . . . . . . . . . . . 37
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Pregnancy, Using Seat Belts . . . . . . . . . 52
Privacy Vehicle Data Recording . . . . . . . . . . 412
Problems with Route Guidance . . . . 168
Program Courtesy Transportation . . . . . . . . . 407
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . 298
Proposition
65 Warning,
California . . . . . . . . . . . . . . .309, 330, 368, Back Cover
Publication Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 410
R
RadioHD Radio Technology . . . . . . . . . . . . 149
Radio Data System (RDS) . . . . . . . . . . 149
Radio Frequency Statement . . . . . . . . 410
Radio Reception . . . . . . . . . . . . . . . . . . . . 150
Radios AM-FM Radio . . . . . . . . . . . . . . . . . . . . . 147
Satellite . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150