Cadillac XT6 2023 Owner's Manual page 380

Warning (Continued)
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.
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.
Coolant Fill Instructions
(3.6L Engine Only)
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.
Vehicle Care
3. Fill the coolant surge tank
with the 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
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