Cadillac XT4 2023 Owner's Manual page 267

266 Vehicle Care
Never dispose of engine coolant by putting
it in the rubbish, pouring it on the ground,
or pouring into sewers, streams, or bodies of
water. Have the coolant changed by an
authorised service centre, 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 water and
DEX-COOL coolant. Be sure the cooling
system is cool before this is done. See
Engine Overheating 0 268.
The coolant surge tank is in the engine
compartment on the driver side of the
vehicle. See Engine Compartment Overview
0 257.
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 jet out at high speed
and you could be burned. Never turn the
cap when the cooling system, including
Warning (Continued)
the pressure cap itself, is hot. Wait for
the cooling system and pressure cap
to cool.
Failure to follow the specific coolant
filling procedure could cause the engine
to overheat and could cause system
damage. If coolant is not visible in the
surge tank, contact your retailer.
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
anticlockwise. If a hiss is heard, wait for
that to stop. A hiss means there is still
(Continued)
some pressure left.
Caution