Cadillac XTS 2019 Owner's Manual page 235

234 VEHICLE CARE
3.6L V6 Twin Turbo Engine
1. Electric Engine Cooling Fans
(Out of View)
2. Charged Air Coolant (CAC)
Bottle and Pressure Cap
3. Coolant Surge Tank and
Pressure Cap
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.
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.
Engine Coolant
The engine and Charged Air Coolant
(CAC) cooling systems in the vehicle
are filled with DEX-COOL engine
coolant mixture.
See Recommended Fluids and
Lubricants 0 298 and Maintenance
Schedule 0 291.
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 0 237.
What to Use
Warning
Plain water, or other liquids such as
alcohol, can boil before the proper
coolant mixture will. With plain
water or the wrong mixture, the
engine could get too hot but there
would not be an overheat warning.
The engine could catch fire and you
or others could be burned.
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.