Hyundai 2016 Azera Owner's Manual page 443

Maintenance
WARNING -
Radiator cap
Do not remove the
radiator cap when the
engine and radiator
are hot. Scalding hot
coolant and steam
may blow out under pressure
causing serious injury.
7 26
CAUTION -
Never
remove the radiator
cap while the engine
is operating or hot.
Doing so might lead
to cooling system and engine
damage.
OHG071006L
Turn the engine off and wait until it
cools down. Use extreme care when
removing the radiator cap. Wrap a
thick towel around it, and turn it
counterclockwise slowly to the first
stop. Step back while the pressure is
released from the cooling system.
When you are sure all the pressure
has been released, press down on
the cap, using a thick towel, and con-
tinue turning counterclockwise to
remove it.
Changing the coolant
Removing
Have the coolant changed by an
radiator cap
authorized HYUNDAI dealer accord-
attempt to
ing to the Maintenance Schedule at
the beginning of this section.
Put a thick cloth around the radiator
cap before refilling the coolant in
order to prevent the coolant from
overflowing into engine parts such as
the alternator.