Buick 1995 Century Owner's Manual page 184

I
NOTICE:
In cold
weather, water can beeze
and crack
the
engine, radiator?
heater core and other
parts. Use
the recommended coolant.
5-18
When the coolant in the coolant recovery tank is at the
FULL HOT,
start your vehicle.
If the overheat warning continues, there's one more
thing you can
try.
You
can add the proper coolant
mix
directly to the radiator, but be sure the cooling
system
is
cool before you do it.