cooling CADILLAC CT6 2020 Owner's Guide

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
362 SERVICE AND MAINTENANCE
Footnotes—Maintenance Schedule
Additional Required Services -
Normal
(1) Vehicles with different size front
and rear tires do not have tire
rotation. See Tire Rotation0329.
(2) Or every two years, whichever
comes first. More frequent passenger
compartment air filter replacement
may be needed if driving in areas with
heavy traffic, poor air quality, high
dust levels, or environmental
allergens. Passenger compartment air
filter replacement may also be needed
if there is reduced airf low, window
fogging, or odors. Your GM dealer can
help determine when to replace the
filter. (3)
Visually check all fuel and vapor
lines and hoses for proper attachment,
connection, routing, and condition.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the transfer case fluid. Contaminated
fluid will decrease the life of the
transfer case and/or axles and should
be replaced.
(5) Or every five years, whichever
comes first. See Cooling System0284. (6)
Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage; replace,
if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0291.
(8) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0295.
(9) Or every 10 years, whichever
comes first. See Gas Strut(s)0296.
(10) Replace air conditioning
desiccant every seven years.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
SERVICE AND MAINTENANCE 363
Maintenance Schedule
Additional Required Services -
Severe12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi
180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 mi
Rotate tires, if recommended for the vehicle, and
perform Required Services. (1) Check engine oil level
and oil life percentage. Change engine oil and filter,
if needed. Check engine air filter life percentage and
status. Change engine air filter, if needed.
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
Replace passenger compartment air filter. (2)@ @@@@@
Inspect evaporative control system. (3)@ @@
Replace spark plugs. Inspect spark plug wires and/or
boots. (4.2L Engine)@ @
Replace spark plugs. Inspect spark plug wires and/or
boots. (3.6L Engine)@
Change automatic transmission fluid and filter.@@@
Change transfer case fluid. (4)@@@
Change rear axle fluid. (4)@@@
Change front axle fluid 4WD. (4)@@@
Drain and fill engine cooling system. (5)@
Visually inspect accessory drive belts. (6)@
Replace brake fluid. (7)
Replace windshield wiper blades. (8)
@ @ @ @ @ @ @ @ @ @
Replace hood and/or body lift support gas struts. (9)@ @
Replace air conditioning desiccant. (10)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
364 SERVICE AND MAINTENANCE
Footnotes—Maintenance Schedule
Additional Required Services -
Severe
(1) Vehicles with different size front
and rear tires do not have tire
rotation. See Tire Rotation0329.
(2) Or every two years, whichever
comes first. More frequent passenger
compartment air filter replacement
may be needed if driving in areas with
heavy traffic, poor air quality, high
dust levels, or environmental
allergens. Passenger compartment air
filter replacement may also be needed
if there is reduced airf low, window
fogging, or odors. Your GM dealer can
help determine when to replace the
filter.
(3) Visually check all fuel and vapor
lines and hoses for proper attachment,
connection, routing, and condition.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the transfer case fluid. Contaminated fluid will decrease the life of the
transfer case and/or axles and should
be replaced.
(5)
Or every five years, whichever
comes first. See Cooling System0284.
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage; replace,
if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0291.
(8) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0295.
(9) Or every 10 years, whichever
comes first. See Gas Strut(s)0296.
(10) Replace air conditioning
desiccant every seven years.Special Application
Services
. Severe Commercial Use Vehicles
Only: Lubricate chassis
components every oil change.
. Have underbody flushing service
performed. See "Underbody
Maintenance" in Exterior Care
0 349.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
TECHNICAL DATA 373
Vehicle Data
Capacities and Specifications
The following approximate capacities are given in metric and English conversions. SeeRecommended Fluids and Lubricants
0 368 for more information.
Application Capacities
Metric English
Air Conditioning Refrigerant For the air conditioning system refrigerant type and charge amount, see the refrigerant label under thehood. See your dealer for more information.
Brake Fluid 0.4 L 0.4 qt
Engine Cooling System* 3.6L V6 Engine 9.8 L 10.4 qt
3.6L V6 Engine with Rear A/C 11.4 L 12.0 qt
4.2L V8 Engine 11.2 L 11.8 qt
4.2L V8 Engine with Rear A/C 12.9 L 13.6 qt
4.2L V8 Engine Intercoolers 2.7 L 2.8 qt
Engine Oil with Filter 3.6L V6 Engine 5.7 L 6.0 qt
4.2L V8 Engine 8.5 L 9.0 qt

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
374 TECHNICAL DATA
ApplicationCapacities
Metric English
Front Axle 0.4 L 0.42 qt
Rear Axle 0.5 L 0.53 qt
Rear Axle 4.2L V8 Twin Turbo (LTA) Engine or V-Series 1.1 L 1.16 qt
Fuel Tank 72.7 L 19.2 gal
Transfer Case –AWD 0.8 L 0.85 qt
Wheel Nut Torque 150 Y110 lb ft
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this manual.
Recheck fluid level after filling.
*Engine cooling system capacity values are based on the entire cooling system and its components.
Engine Specifications
Engine VIN CodeTransmission Spark Plug Gap
3.6L V6 Engine (LGX) SAutomatic0.80–0.90 mm (0.031–0.035 in)
4.2L V8 Engine (LTA) JAutomatic 0.74–0.75 mm (0.029–0.030 in)
Spark plug gaps are preset by the manufacturer. Re-gapping the spark plug is not recommended and can damage the
spark plug.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
402 INDEX
Climate Control SystemsAutomatic . . . . . . . . . . . . . . . . . . . . 158, 163
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Cluster, Instrument . . . . . . . . . . . .110, 113
Collision Damage Repair . . . . . . . . . . . 383
Compact Spare Tire . . . . . . . . . . . . . . . . . 342
Compartments Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Connected Services Connections . . . . . . . . . . . . . . . . . . . . . . . 398
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 399
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . 397
Connections Connected Services . . . . . . . . . . . . . . . 398
Control
Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Control of a Vehicle . . . . . . . . . . . . . . . . 173
Convenience Net . . . . . . . . . . . . . . . . . . . . 101
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . 33
Coolant Engine Temperature Gauge . . . . . . 119
Engine Temperature WarningLight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Cooling . . . . . . . . . . . . . . . . . . . . . . . . .158, 163
Cooling System . . . . . . . . . . . . . . . . . . . . . 284
Cornering Lamps . . . . . . . . . . . . . . . . . . . 153 Courtesy Lamps . . . . . . . . . . . . . . . . . . . . . 154
Courtesy Transportation
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . 209 Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Cruise Control, Adaptive . . . . . . . . . . . 211
Cruise Control, Super . . . . . . . . . . . . . . . 220
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Customer Assistance . . . . . . . . . . . . . . . 378 Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Text Telephone (TTY) Users . . . . . 378
Customer Information Publications OrderingInformation . . . . . . . . . . . . . . . . . . . . . . 385
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Cybersecurity . . . . . . . . . . . . . . . . . . . . . . . . 387
D
Damage Repair, Collision . . . . . . . . . . . 383
Danger, Warning, and Caution . . . . . . . . 2
Data Collection Infotainment System . . . . . . . . . . . . . 389
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
Data Recorders, Event . . . . . . . . . . . . . . 388
Daytime Running Lamps (DRL) . . . 151
Defensive Driving . . . . . . . . . . . . . . . . . . . 173
Delayed Locking . . . . . . . . . . . . . . . . . . . . . 21 Diagnostics
Connected Services . . . . . . . . . . . . . . . 399
Distracted Driving . . . . . . . . . . . . . . . . . . 172
Dome Lamps . . . . . . . . . . . . . . . . . . . . . . . . 154
Door Ajar Light . . . . . . . . . . . . . . . . . . . . . . . . . 132
Delayed Locking . . . . . . . . . . . . . . . . . . . . 21
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rear Seat Pass-Through . . . . . . . . . . . . 57
Drive Belt Routing, Engine . . . . . . . . . 375
Drive Systems
All-Wheel Drive . . . . . . . . . . . . . . 199, 293
Driver Assistance Systems . . . . . . . . . 234
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . . . . 132
Driver Mode Control . . . . . . . . . . . . . . . . 204
Driver Mode Control Light . . . . . . . . . 129
Driving Assistance Systems . . . . . . . . . . . . . . . 243
Better Fuel Economy . . . . . . . . . . . . . 172
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . . . . . 262
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Hill and Mountain Roads . . . . . . . . 177
If the Vehicle is Stuck . . . . . . . . . . . . 179
Loss of Control . . . . . . . . . . . . . . . . . . . . 175

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-13566829) -
2020 - CRC - 6/11/19
INDEX 403
Driving (cont'd)Off-Road Recovery . . . . . . . . . . . . . . . . 175
Track Events and Competitive . . . 176
Vehicle Load Limits . . . . . . . . . . . . . . 179
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 176
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
E
Electric Brake Boost . . . . . . . . . . . . . . . . 199
Electric Parking Brake . . . . . . . . . . . . . . 200
Electric Parking Brake Light . . . . . . . 125
Electrical Equipment, Add-On . . . . . 269
Electrical System
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Fuses and Circuit Breakers . . . . . . . 298
Instrument Panel Fuse Block . . . . 306
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 282
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 123
Compartment Overview . . . . . . . . . . 274
Coolant Temperature Gauge . . . . . 119 Engine (cont'd)
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . . 129
Cooling System . . . . . . . . . . . . . . . . . . . 284
Drive Belt Routing . . . . . . . . . . . . . . . . 375
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Oil Life System . . . . . . . . . . . . . . . . . . . . 280
Oil Pressure Gauge . . . . . . . . . . . . . . . . 117
Oil Pressure Light . . . . . . . . . . . . . . . . . 130
Overheating . . . . . . . . . . . . . . . . . . . . . . . 288
Power Messages . . . . . . . . . . . . . . . . . . 139
Running While Parked . . . . . . . . . . . 192
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Engine Air Filter Life System . . . . . . 281
Engine Oil Temperature Gauge . . . . . . . . . . . . . . . 118
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 155
Equipment, Towing . . . . . . . . . . . . . . . . . 267
Event Data Recorders . . . . . . . . . . . . . . 388
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 155
Extended Parking . . . . . . . . . . . . . . . . . . . 191
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 64
Exterior Lamp Controls . . . . . . . . . . . . 149
Exterior Lamps Off Reminder . . . . . . 151
Exterior Lighting Battery Saver . . . . 156
F
Filter,
Engine Air Cleaner . . . . . . . . . . . . . . . . 282
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 151
Flashers, Hazard Warning . . . . . . . . . . 152
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
Fluid Automatic Transmission . . . . . . . . . 281
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 33
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Front Seats Heated and Ventilated . . . . . . . . . . . . . 51
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 259
Economy, Driving for Better . . . . . 172
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 261
Filling the Tank . . . . . . . . . . . . . . . . . . . 260
Foreign Countries . . . . . . . . . . . . . . . . . 259