Chevrolet 2006 Epica Owner's Manual page 251

CAUTION:
{
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. Do not 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 counterclockwise about two or
two and one-half turns.
If you hear a hiss, wait for that to stop. This will
allow any pressure still left to be vented out
the discharge hose.
2. Then keep turning the
pressure cap slowly,
and remove it.
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