Cadillac CRC 2021 Manual page 270

Cadillac XT4 Owner Manual (GMNA-Localizing-MidEast-14584650) - 2021 -
CRC - 7/15/20
270 VEHICLE CARE
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
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
Caution (Continued)
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.
3. If topping off the level in the
coolant surge tank, add the proper
mixture until the level reaches the
mark on the front of the tank and
replace the cap. Operate the
vehicle. Repeat steps 1 3, as
necessary.
If filling the system (such as after
servicing), follow the Automatic
Coolant Service Fill Instructions.
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.