Draining Procedure
CAUTION:
As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in the radiator without causing the solution to boil. Removal of the pressure cap while the engine is hot and pressure is high will cause the solution to boil instantaneously - possibly with explosive force - spewing the solution over the engine, fenders and the person removing the cap.
NOTE:
When adding coolant, it is important that you use GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® coolant. If Coolant other than DEX-COOL® or HAVOLINE® DEX-COOL® is added to the system the engine coolant will require change sooner; at 50 000 km (30,000 mi) or 24 months.
- Allow the engine to cool completely.
- Place a drain pan under the lower radiator hose.
- Using the J 38185 reposition the radiator inlet hose clamp from the radiator.
- Remove the radiator inlet hose from the radiator.
- Remove the radiator cap.
- Allow the coolant to drain from the system until the flow stops.
- Place a drain pan under the block drain hole plug.
- Remove the drain hole plug from the engine block.
- Allow the coolant to drain from the block until the flow stops.
- Install the block drain hole plug.
- Install the radiator inlet hose to the radiator.
- Using the J 38185 reposition the radiator inlet hose clamp to the radiator.