Chevrolet 2005 Aveo Owner's Manual page 212

3. Fill the coolant surge tank with the proper mixture
to the MAX mark on the coolant surge tank. Wait
about five minutes, then check to see if the level is
below the MAX mark. If the level is below the
MAX mark, add additional coolant to bring the level
up to the MAX mark. Repeat this procedure until
the level remains constant at the MAX mark
for at least five minutes.
5-30
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. 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 than
the MAX mark, add more of the proper mixture
to the coolant surge tank until the level reaches the
MAX mark.
5. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
See your dealer, if necessary.