2019 CADILLAC CT6 heater

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
308 VEHICLE CARE
3.6L V6 Engine
1. Engine Coolant Surge Tankand Pressure Cap (Under
Cover)
2. Engine Cooling Fan (Out of View)
4.2L V8 Engine
1. Engine Coolant Surge Tankand Pressure Cap (Under
Cover)
2. Engine Cooling Fan (Out of View)
{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. If the coolant inside the coolant surge
tank is boiling, do not do anything
else until it cools down. The vehicle
should be parked on a level surface.
The coolant level should be at the
cold fill mark on the middle of the
tank. If it is not, the vehicle may have
a leak at the radiator hoses, heater
hoses, radiator, water pump,
or somewhere else in the cooling
system.
{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.
If there seems to be no leak, with the
engine on, check to see if the electric
cooling fan is running. If the engine is
overheating, the fan should be
running. If it is not, the vehicle needs
service. Turn off the engine.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
VEHICLE CARE 313
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 engine coolant temperature
gauge is no longer in the overheated
area or the engine coolant
temperature warning light no longer
displays, the vehicle can be driven. Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
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 0292 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 CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
VEHICLE CARE 325
FusesUsage
22 Transmission auxiliary oil pump
cooling
23 –
24 Cabin heater pump
26 Engine control module ignition
27 Steering column lock ignition
28 Rear heated seats ignition
29 Front heated seats ignition
30 –
31 Headlamp/Daytime running lamps/Right
headlamp
32 –
33 –
34 –
35 Engine control module ignition –2 Fuses
Usage
36 Engine control module ignition –1
37 Coolant pump/ Ignition coils –odd
38 Ignition coils –even/
Non walk 2
39 Non walk
40 Electric brake control module1/Instrument
cluster/central
gateway module
ignition
41 –
42 Fuel tank zone module/Ignition
43 Heated steering wheel module/
Reflective light aux
display/HVAC IGN/
Automatic occupant
sensing display
44 Aeroshutter
45 Washer Fuses
Usage
46 Front short range radar sensors
47 Left cornering LED
54 –
55 –
56 –
57 –
58 –
59 –
60 Antilock brake system pump/Electric
brake control
module–1
61 Front wiper
62 Headlamp leveling
63 –
64 –
66 Transfer case control module
67 –
68 –

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
326 VEHICLE CARE
FusesUsage
69 –
70 –
71 Antilock brake system valve
72 –
73 –
Relays Usage
14 Air conditioning control
15 Starter motor
16 Starter pinion
17 Run/Crank
19 –
20 High-beam headlamp
25 Cabin heater pump
48 –
49 –
50 Engine control module
51 Wiper speed Relays
Usage
52 Wiper control
53 Headlamp control
65 –
4.2L Engine
The 4.2L engine has an underhood
fuse block on each side of the engine
compartment.
Driver Side Fuse Block
Lift the fuse block cover to access the
fuses.
The vehicle may not be equipped with
all of the fuses and relays shown.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the covers
on any electrical component.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
VEHICLE CARE 329
FusesUsage
F1 Electric brake control module–2
F2 –
F3 Headlamp/Daytime running lamps
F4 Right cornering LED
F5 – Fuses
Usage
F6 Front short range radar sensors
F7 Horn
F8 Air conditioning clutch
F9 –
F10 – Fuses
Usage
F11 Automatic headlamp leveling
F12 Starter motor
F13 Starter pinion
F14 –
F15 –
F16 –
F17 Cabin heater pump
F18 Transmission auxiliary oil pump
cooling
F19 Engine control module ignition
F20 Non walk
F21 Ignition coils –even/
Non walk –2
F22 Engine control module ignition –1
F23 Transfer case control module
F24 –
F25 Ignition coils –odd

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
330 VEHICLE CARE
FusesUsage
F26 Charge air coolant pump
F27 Engine control module ignition –2
F28 –
F29 –
Relays Usage
R1 Headlamp/Daytime running lamps
R2 Air conditioning control
R3 Starter motor
R4 Starter pinion
R5 Cabin heater pump
R6 Engine control module
R7 –
R8 –Instrument Panel Fuse
Block
The instrument panel fuse block is
behind the driver side instrument
panel storage compartment.
The storage compartment has a press
to open latch. To access the fuses,
open the compartment by pressing
and releasing near the top center
square.
Apply pressure to the two retaining
tabs on the sides of the compartment,
until the two retaining tabs clear the
sides of the instrument panel. Allow
the compartment to move downward,
and out of the way.
To reinstall the compartment, reverse
the steps.
The vehicle may not be equipped with
all of the fuses shown.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
INDEX 429
Driving (cont'd)Vehicle Load Limits . . . . . . . . . . . . . . 197
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 193
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
E
Electric Parking Brake . . . . . . . . . . . . . . 218
Electric Parking Brake Light . . . . . . . 143
Electrical Equipment, Add-On . . . . . 287
Electrical System
Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Fuses and Circuit Breakers . . . . . . . 322
Instrument Panel Fuse Block . . . . 330
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 304
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 139
Compartment Overview . . . . . . . . . . 292
Coolant Temperature Gauge . . . . . 135
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . . 146
Cooling System . . . . . . . . . . . . . . . . . . . 307 Engine (cont'd)
Drive Belt Routing . . . . . . . . . . . . . . . . 399
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Oil Life System . . . . . . . . . . . . . . . . . . . . 302
Oil Pressure Gauge . . . . . . . . . . . . . . . . 134
Oil Pressure Light . . . . . . . . . . . . . . . . . 147
Overheating . . . . . . . . . . . . . . . . . . . . . . . 312
Power Messages . . . . . . . . . . . . . . . . . . 156
Running While Parked . . . . . . . . . . . 210
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Engine Air Filter Life System . . . . . . 304
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 172
Equipment, Towing . . . . . . . . . . . . . . . . . 286
Event Data Recorders . . . . . . . . . . . . . . 412
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 172
Extended Parking . . . . . . . . . . . . . . . . . . . 209
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 82
Exterior Lamp Controls . . . . . . . . . . . . 166
Exterior Lamps Off Reminder . . . . . . 168
Exterior Lighting Battery Saver . . . . 173
F
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 304 Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 168
Flashers, Hazard Warning . . . . . . . . . . 169
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 361
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Fluid Automatic Transmission . . . . . . . . . 303
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 53
Forward Automatic Braking . . . . . . . . 264
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Front Pedestrian Braking (FPB)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Front Seats Heated and Ventilated . . . . . . . . . . . . . 70
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 278
Economy Driving . . . . . . . . . . . . . . . . . . . 27
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . . . . . . 280
Filling the Tank . . . . . . . . . . . . . . . . . . . 278
Foreign Countries . . . . . . . . . . . . . . . . . 278
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Low Fuel Warning Light . . . . . . . . . 148

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
430 INDEX
Fuel (cont'd)Management, Active . . . . . . . . . . . . . . 208
Prohibited Fuels . . . . . . . . . . . . . . . . . . 277
Recommended . . . . . . . . . . . . . . . . . . . . 277
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Fuses Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Fuses and Circuit Breakers . . . . . . . 322
Instrument Panel Fuse Block . . . . 330
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
G
Garage Door Opener . . . . . . . . . . . . . . . . 162Programming . . . . . . . . . . . . . . . . . . . . . . 162
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . 320
Gauges Engine Coolant Temperature . . . . 135
Engine Oil Pressure . . . . . . . . . . . . . . . 134
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Speedometer . . . . . . . . . . . . . . . . . . . . . . 133
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 133
Trip Odometer . . . . . . . . . . . . . . . . . . . . 133
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Gauges (cont'd)
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . . . . . . 126
Gear Shifting Light . . . . . . . . . . . . . . . . . 144
General Information
Service and Maintenance . . . . . . . . 381
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . 289
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
H
Hazard Warning Flashers . . . . . . . . . . 169
Head Restraints . . . . . . . . . . . . . . . . . . . . . . 63
Head-up Display . . . . . . . . . . . . . . . . . . . . 152
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 169
Bulb Replacement . . . . . . . . . . . . . . . . 321
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . . . . . . 168
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . 168
High-Beam On Light . . . . . . . . . . . . . . 148
High/Low Beam Changer . . . . . . . . . 168
Lamps On Reminder . . . . . . . . . . . . . . 149
Heated Steering Wheel . . . . . . . . . . . . . . . . . . . . 119 Heated and Ventilated Front
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Heated and Ventilated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . 53
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Heating . . . . . . . . . . . . . . . . . . . . . . . . .175, 180
High-Beam On Light . . . . . . . . . . . . . . . . 148
High-Speed Operation . . . . . . . . . . . . . . 347
Hill and Mountain Roads . . . . . . . . . . 194
Hill Start Assist (HSA) . . . . . . . . . . . . . 219
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
How to Wear Seat Belts Properly . . . 77
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . .175, 180
I
Ignition Positions . . . . . . . . . . . . . . . . . . . 201
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Indicator Pedestrian Ahead . . . . . . . . . . . . . . . . . 145
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . 144
Infants and Young Children, Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Information
Publication Ordering . . . . . . . . . . . . . 410
Infotainment . . . . . . . . . . . . . . . . . . . . . . . . 174