Chevrolet 1993 Corvette Owner's Manual page 268

1.
When the engine is cool, remove the
pressure cap.
Without pressing down on the
pressure cap, turn it slowly to the
left: until it reaches a "stop."
If you hear a hiss, it means there is
stiU. some pressure. Wait €or the
hiss to stop. Then press down on
the pressure cap and continue
turning it to the left. Remove the
pressure cap.
A
YOU
-can
be burned if you,.
'.
spill coolant on hot .engine
parts.' Coolant contains ethylene
glycol, .and .it
. w i l l
burn if the engine
parts are hot enough. Don't spill
coolafit on .a hot engine.