GMC 2007 Acadia Owner's Manual page 409

Adding Coolant
If more coolant is needed, add the proper
®
DEX-COOL coolant mixture at the coolant
recovery tank, but be careful not to spill it.
If the coolant recovery tank is completely empty,
add coolant to the radiator. See Engine
Overheating on page 410.
CAUTION:
{
Turning the radiator pressure cap
when the engine and radiator are hot can
allow steam and scalding liquids to blow
out and burn you badly. With the coolant
recovery tank, you will almost never have
to add coolant at the radiator. Never
turn the radiator pressure cap — even a
little — when the engine and radiator
are hot.
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.
Occasionally check the coolant level in the
radiator. For information on how to add coolant to
the radiator, see Cooling System on page 413.
409