2013 Chevrolet Tahoe Owner Manual - Page 357

Vehicle Care WARNING (Continued) cap, is hot. Wait for the cooling system and surge tank pressure cap to cool. If no coolant is visible in the surge tank, add coolant as follows: 2. Keep turning the pressure cap slowly and remove it. 10-17 1. 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 about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left. 3. Fill the coolant surge tank with the proper mixture to the FULL COLD mark. 4. With the coolant surge tank pressure cap off, start the engine and let it run until the upper radiator hose can be felt 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, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD mark. 5. Replace the pressure cap tightly.