Chevrolet 2009 Corvette Owner's Manual page 314

3. Fill the coolant surge tank with the proper
DEX-COOL coolant mixture until the level inside
stabilizes at the FULL COLD mark on the front
of the surge tank.
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4. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the upper
radiator hose getting hot. Any time during this
procedure, watch out for the engine cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge tank
until the level stabilizes at the FULL COLD mark
on the coolant surge tank.