GM Service Manual Online
For 1990-2009 cars only
  1. Park the vehicle on a level surface.
  2. Remove and clean or flush the coolant surge tank. Refer to Radiator Surge Tank Replacement .
  3. Flush the engine cooling system. Follow the flushing equipment manufacturer's instructions.
  4. Install the coolant surge tank. Refer to Radiator Surge Tank Replacement .
  5. Fill the cooling system. Refer to Cooling System Draining and Filling .