2005 Pontiac Grand Am Owner's Manual - Page 238

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