Pontiac 2008 Torrent Owner's Manual page 306

CAUTION:
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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.
Turn the pressure cap slowly counterclockwise
about one-quarter of a turn. 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.
5-30
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.
3. Fill the coolant surge tank with the proper
®
DEX-COOL coolant mixture, to the COLD FILL line.