Chevrolet 1998 Cavalier Owner's Manual page 242

NOTICE:
In cold weather, water can freeze and crack the
engine, radiator, heater
core
and other parts. So
use the recommended coolan-.
r - -
-
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it
will
burn
if
the engine parts are hot
enough. Don't spill coolant on a hot engine.
1. You can remove the coolant surge tank pressure cap
when the cooling system, including the coolant surge
tank pressure cap and upper radiator hose, is
no
longer hot. Turn the pressure cap slowly about
one-quarter turn to the left and then stop.
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
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