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Draining Procedure Buick Century VI

Engine Cooling System

Draining Procedure

CAUTIONWith a pressurized cooling system, the coolant temperature in the radiator can be considerably higher than the boiling point of the solution at atmospheric pressure. Removal of the surge tank cap, while the cooling system is hot and under high pressure, causes the solution to boil instantaneously with explosive force. This will cause the solution to spew out over the engine, the fenders, and the person removing the cap. Serious bodily injury may result.
  1. Park the vehicle on a level surface.
  2. Remove the coolant pressure cap.
  3. Raise and support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(/buick/century/vi-1997-2005/remont/hoistjack/#jacking-and-lifting__lifting-and-jacking-the-vehicle) in General Information.
  4. Place a drain pan under the drain cock.
  5. Open the radiator drain cock.
  6. Drain the cooling system.
  7. If a complete engine block drain is required, remove the engine block drain plug.
  8. Inspect the coolant.
  9. Follow the appropriate procedure based on the condition of the coolant. Normal in appearance - follow the filling procedure. Discolored - follow the flush procedure. Refer to «FLUSHING»(/buick/century/vi-1997-2005/remont/cooling-system-mechanical/#engine-cooling-system__flushing) .