engine overheat CADILLAC XT6 2020 User Guide

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
270 VEHICLE CARE
appropriate levels. SeeRecommended
Fluids and Lubricants 0343 and
Maintenance Schedule 0333.
The following explains the cooling
systems and how to check and add
coolant when it is low. If there is a
problem with engine overheating, see
Engine Overheating 0272.
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 pouring 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.
Check to see if coolant is visible in the
coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, do not do anything else until
it cools down. If coolant is visible but
the coolant level mark is not at or
above the indicated mark, add a
50/50 mixture of clean, drinkable

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
VEHICLE CARE 271
water and DEX-COOL coolant. Be sure
the cooling system is cool before this
is done. SeeEngine Overheating 0272.
The coolant surge tank is located in
the engine compartment on the driver
side of the vehicle. See Engine
Compartment Overview 0263.
How to Add Coolant to the
Surge Tank
{Warning
Spilling coolant on hot engine parts
can burn you. Coolant contains
ethylene glycol and it will burn if
the engine parts are hot enough.
{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
(Continued)
Warning (Continued)
when the cooling system, including
the pressure cap, is hot. Wait for
the cooling system and pressure
cap to cool.
Caution
Failure to follow the specific
coolant fill procedure could cause
the engine to overheat and could
cause system damage. If coolant is
not visible in the surge tank,
contact your dealer.
The coolant surge tank pressure cap
can be removed when the cooling
system, including the surge tank
pressure cap and upper radiator hose,
is no longer hot.
1. Turn the pressure cap slowly counterclockwise. If a hiss is
heard, wait for that to stop.
A hiss means there is still some
pressure left.
2. Keep turning the pressure cap slowly and remove it.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
272 VEHICLE CARE
3. Fill the coolant surge tank withthe proper mixture to the mark
pointed to on the front of the
coolant surge tank.
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 fans. 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 coolant
surge tank until the level reaches
the mark pointed to on the front
of the coolant surge tank.
5. Replace the pressure cap tightly.
6. Verify coolant level after the engine is shut off and the
coolant is cold. If necessary,
repeat coolant fill procedure
Steps 1–6.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 several indicators to
warn of the engine overheating.
There is an engine coolant
temperature gauge on the instrument
cluster. See Engine Coolant Temperature
Gauge 0117. The vehicle may also
display a message on the Driver
Information Center (DIC).
If the decision is made not to lift the
hood when this warning appears, get
service help right away. See Roadside
Service 0353.
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 XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
VEHICLE CARE 273
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
The appropriate message will appear
in the Driver Information Center (DIC)
when the fluid level is low.
Open the cap with the washer symbol
on it. Add washer fluid until the tank
is full. See
Engine Compartment
Overview 0263 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
(Continued)

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
376 INDEX
E
Electric Brake Boost . . . . . . . . . . . . . . . . 197
Electric Parking Brake . . . . . . . . . . . . . . 198
Electric Parking Brake Light . . . . . . . 122
Electrical Equipment, Add-On . . . . . 256
Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
Fuses and Circuit Breakers . . . . . . . 281
Instrument Panel Fuse Block . . . . 285
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 268
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 120
Compartment Overview . . . . . . . . . . 263
Coolant Temperature Gauge . . . . . 117
Cooling System . . . . . . . . . . . . . . . . . . . 269
Drive Belt Routing . . . . . . . . . . . . . . . . 348
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Oil Life System . . . . . . . . . . . . . . . . . . . . 266
Oil Pressure Light . . . . . . . . . . . . . . . . . 126
Overheating . . . . . . . . . . . . . . . . . . . . . . . 272 Engine (cont'd)
Power Messages . . . . . . . . . . . . . . . . . . 135
Running While Parked . . . . . . . . . . . 190
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Engine Air Filter Life System . . . . . . 267
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 151
Equipment, Towing . . . . . . . . . . . . . . . . . 252
Event Data Recorders . . . . . . . . . . . . . . 361
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 151
Extended Parking . . . . . . . . . . . . . . . . . . . 189
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 62
Exterior Lamp Controls . . . . . . . . . . . . 144
Exterior Lamps Off Reminder . . . . . . 147
Exterior Lighting Battery Saver . . . . 151
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 268
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 147
Flashers, Hazard Warning . . . . . . . . . . 148
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
Fluid Automatic Transmission . . . . . . . . . 267
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 33 Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Front Seats
Heated and Ventilated . . . . . . . . . . . . . 48
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Economy, Driving for Better . . . . . 165
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 244
Filling the Tank . . . . . . . . . . . . . . . . . . . 242
Foreign Countries . . . . . . . . . . . . . . . . . 242
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Low Fuel Warning Light . . . . . . . . . 127
Management, Active . . . . . . . . . . . . . . 188
Prohibited Fuels . . . . . . . . . . . . . . . . . . 241
Recommended . . . . . . . . . . . . . . . . . . . . 241
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Fuses Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
Fuses and Circuit Breakers . . . . . . . 281
Instrument Panel Fuse Block . . . . 285
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-12984300) -
2020 - CRC - 3/19/19
INDEX 379
Messages (cont'd)Vehicle Speed . . . . . . . . . . . . . . . . . . . . . 135
Mirror Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . 34
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . 34
Automatic Dimming Rearview . . . . . 34
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . 34
Mirrors, Interior Rearview . . . . . . . . . . . 34
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Driver Control . . . . . . . . . . . . . . . . . . . . . 202
Monitor System, Tire Pressure . . . . . 298
N
Navigation Connected Services . . . . . . . . . . . . . . . 370
Net, Convenience . . . . . . . . . . . . . . . . . . . 102
New Vehicle Break-In . . . . . . . . . . . . . . . 180
Night Vision System . . . . . . . . . . . . . . . . 232
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Off-Road (cont'd)
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Engine Oil Life System . . . . . . . . . . . 266
Pressure Light . . . . . . . . . . . . . . . . . . . . . 126
Older Children, Restraints . . . . . . . . . . . 75
Online Owner Center . . . . . . . . . . . . . . . 352
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362
OnStar Additional Information . . . . 365
OnStar Emergency . . . . . . . . . . . . . . . . . . 364
OnStar Overview . . . . . . . . . . . . . . . . . . . . 363
OnStar Security . . . . . . . . . . . . . . . . . . . . . 364
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Overheating, Engine . . . . . . . . . . . . . . . . 272
Overview Instrument Panel . . . . . . . . . . . . . . . . . . . . 5
P
Park
Shifting Into . . . . . . . . . . . . . . . . . . . . . . 186
Shifting Out of . . . . . . . . . . . . . . . . . . . . 186
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Parking
Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 277
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 189 Parking (cont'd)
Over Things That Burn . . . . . . . . . . . 188
Parking or Backing Assistance Systems . . . . . . . . . . . . . . . 217
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Passenger Sensing System . . . . . . . . . . 69
Pedestrian Ahead Indicator . . . . . . . . 124
Perchlorate Materials
Requirements, California . . . . . . . . . 260
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Protection, Battery . . . . . . . . . . . . . . . . 151
Retained Accessory (RAP) . . . . . . . . 186
Seat Adjustment . . . . . . . . . . . . . . . . . . . . 44
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Pregnancy, Using Seat Belts . . . . . . . . . 61
Privacy
Vehicle Data Recording . . . . . . . . . . 360
Program Courtesy Transportation . . . . . . . . . 355
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . 241