Chevrolet 2001 Corvette Owner's Manual page 259

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 (left) about one
then stop.
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
2. Then keep turning the pressure cap slowly, and
remove it.
5-16
3. Then fill the coolant surge tank with the proper
-
quarter turn and
mixture, to the FULL COLD mark on the coolant
surge tank.