Pontiac 2007 G5 Owner's Manual page 294

How to Add Coolant to the Coolant
Surge Tank
Notice: This vehicle has a specific coolant fill
procedure. Failure to follow this procedure
could cause your engine to overheat and
be severely damaged.
If you have not found a problem yet, check to
see if coolant is visible in the coolant surge tank.
If coolant is visible but the coolant level is not at
the COLD FILL line, add a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant surge tank, but be sure the cooling system,
including the coolant surge tank pressure cap, is
cool before you do it. See Engine Coolant on
page 287 for more information.
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coolant at the
If no coolant is visible in the coolant surge tank,
add coolant as follows:
CAUTION:
{
Steam and scalding liquids from a hot
cooling system can blow out and burn
you badly. They are under pressure, and if
you turn the coolant surge tank pressure
cap — even a little — they can come out at
high speed. Never turn the cap when the
cooling system, including the coolant
surge tank pressure cap, is hot. Wait for
the cooling system and coolant surge
tank pressure cap to cool if you ever
have to turn the pressure cap.