2023 CADILLAC CT5 heater

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
394 Vehicle Care
Engine Coolant
The cooling system in the
vehicle is filled with
DEX-COOL engine coolant.
See Maintenance Schedule
0471 and
Recommended Fluids and
Lubricants 0476.
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 0398.
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
(Continued)
Caution (Continued)
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-16500419) -
2023 - CRC - 5/6/22
Vehicle Care 399
.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 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. See
Engine Compartment
Overview
0378 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 CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/11/22
INDEX 515
E
ElectricBrake Boost . . . . . . . . . . . . . . . . . . 287
Parking Brake . . . . . . . . . . . . . . 288
Parking Brake Light . . . . . . . 128
Electrical Equipment, Add-On . . . . . . . . 372
System Overload . . . . . . . . . . 409
Electrical System Engine Compartment
Fuse Block . . . . . . . . . . . . . . . . . . 412
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . . . 411
Instrument Panel Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . 414
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . 416
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . 502
Engine Air Cleaner/Filter . . . . . . . . . . 389
Air Filter Life System . . . . . 389
Check Light(Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 125
Compartment Overview . . . . . . . . . . . . . . . . . . . 378 Engine (cont'd)
Coolant
Temperature
Gauge . . . . . . . . . . . . . . . . . . 121, 122
Coolant Temperature Warning Light . . . . . . . . . . . . . . 131
Cooling System . . . . . . . . . . . . 392
Drive Belt Routing . . . . . . . . . 484
Exhaust . . . . . . . . . . . . . . . . . . . . . . . 276
Heater . . . . . . . . . . . . . . . . . . . . . . . . . 272
Oil Life System . . . . . . . . . . . . . 386
Oil Pressure Light . . . . . . . . . . 134
Overheating . . . . . . . . . . . . . . . . . 398
Power Messages . . . . . . . . . . . 148
Running While Parked . . . . 276
Starting . . . . . . . . . . . . . . . . . . . . . . 269
Entry Lighting . . . . . . . . . . . . . . . . . 158
Equipment, Towing . . . . . . . . . . 371
Event Data Recorders . . . . . 499
Exit Lighting . . . . . . . . . . . . . . . . . . . 158
Extended Parking . . . . . . . . . . . .275
Extender, Seat Belt . . . . . . . . . . . 64
Exterior Lamp Controls . . . . . . . . . . . . . . 152
Lamps Off Reminder . . . . . . 154
Lighting BatterySaver . . . . . . . . . . . . . . . . . . . . . . . . . 160
F
FilterEngine Air Cleaner . . . . . . . . 389
Flash-to-Pass . . . . . . . . . . . . . . . . . . 154
Flashers, Hazard Warning . . . . . . . . . . . . . . . . . . . . . . . 156
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 443
Floor Mats . . . . . . . . . . . . . . . . . . . . . 467
Fluid Automatic
Transmission . . . . . . . . . . . . . . 388
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 404
Washer . . . . . . . . . . . . . . . . . . . . . . . 399
Folding Mirrors . . . . . . . . . . . . . . . . . 33
Forward
Collision Alert (FCA)System . . . . . . . . . . . . . . . . . . . . . . 346
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . 496
Front Heated and VentilatedSeats . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Pedestrian Braking (FPB) System . . . . . . . . . . . . . . 351
Fuel Additives . . . . . . . . . . . . . . . . . . . . . 362
Economy, Driving forBetter . . . . . . . . . . . . . . . . . . . . . . . . 241

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/11/22
516 INDEX
Fuel (cont'd)Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . 364
Filling the Tank . . . . . . . . . . . . . 362
Foreign Countries . . . . . . . . . . 361
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Management, Active . . . . . . . 275
Prohibited Fuels . . . . . . . . . . . . 361
Recommended . . . . . . . 360, 361
Top Tier . . . . . . . . . . . . . . . . . . . . . . 360
Fuses Engine CompartmentFuse Block . . . . . . . . . . . . . . . . . . 412
Fuses and Circuit
Breakers . . . . . . . . . . . . . . . . . . . . . 411
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . 414
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . 416
G
Garage Door Opener . . . . . . . . 148
Programming . . . . . . . . . . . . . . . . 148
Gas Strut(s) . . . . . . . . . . . . . . . . . . . 408 Gauges
Engine Coolant
Temperature . . . . . . . . . 121, 122
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Odometer . . . . . . . . . . . . . . . . . . . . . 119
Speedometer . . . . . . . . . . . . . . . . 119
Tachometer . . . . . . . . . . . . . . . . . . 120
Trip Odometer . . . . . . . . . . . . . . 119
Warning Lights and Indicators . . . . . . . . . . . . . . . . . . . . 112
General Information
Service andMaintenance . . . . . . . . . . . . . . 469
Towing . . . . . . . . . . . . . . . . . . . . . . . . 364
Vehicle Care . . . . . . . . . . . . . . . . 374
Global Positioning
System (GPS) . . . . . . . . . . . . . . . . .191
Glove Box . . . . . . . . . . . . . . . . . . . . . . .100
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . 489
Guidance Problems with theRoute . . . . . . . . . . . . . . . . . . . . . . . . . 192
H
Hazard WarningFlashers . . . . . . . . . . . . . . . . . . . . . . . 156
HD Radio Technology . . . . . . . . 171
Head Restraints . . . . . . . . . . . . . . . 43
Head-Up Display (HUD) . . . . . 143
Headlamps Aiming . . . . . . . . . . . . . . . . . . . . . . . . 409
Automatic . . . . . . . . . . . . . . . . . . . . . 155
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . 154
Flash-to-Pass . . . . . . . . . . . . . . . . 154
High-Beam On Light . . . . . . . 135
High/Low Beam Changer . . . . . . . . . . . . . . . . . . . . . 154
Lamps On Reminder . . . . . . . 135
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Steering Wheel . . . . . . . . . . . . . 105
Ventilated Front Seats . . . . . 51
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . 272
Heating . . . . . . . . . . . . . . . . . . . . . . . . . 233
High-Beam On Light . . . . . . . . . 135
High-Speed Operation . . . . . 429
Hill and Mountain Roads . . . . . . . . . . . . . . . . . . . . . . . . . 258