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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Cooling System) >> Repair Instructions >> Draining and Filling Cooling System >> Draining Procedure

Draining Procedure

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.
    IMPORTANT: Draining the cooling system with the pressure cap installed will syphon the coolant from the overflow tank.
  1. Remove the coolant pressure cap.
  2. Place a drain pan under the drain cock.
  3. Open the radiator drain cock.
  4. Drain the cooling system.
  5. If a complete engine block drain is required L26 or L32 engine, remove the knock sensors. Refer to Knock Sensor (KS) 1 Replacement and Knock Sensor (KS) 2 Replacement in Engine Controls - 3.8L (L26 and L32).
  6. Inspect the coolant.
  7. 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 .
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