How To Add Coolant To The Radiator - Buick 2005 Century Owner's Manual

If the overheated engine warnings continue, there is
one more thing that can be done. Add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before this is done.
CAUTION:
{
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly.
They are under pressure, and if you turn the
radiator pressure cap — even a little — they
can come out at high speed. Never turn the
cap when the cooling system, including the
radiator pressure cap, is hot. Wait for the
cooling system and radiator pressure cap to
cool if you ever have to turn the pressure cap.
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How to Add Coolant to the Radiator

Notice: Your engine has a specific radiator fill
procedure. Failure to follow this procedure
could cause your engine to overheat and be
severely damaged.
Remove the radiator pressure cap when the cooling
system, including the radiator pressure cap and upper
radiator hose, is no longer hot.
1. Turn the pressure cap slowly counterclockwise to
its first stop. Do not press down while turning the
pressure cap.
If a hiss is heard, wait for it to stop. A hiss means
there is still some pressure left.