Cooling System Bleeding

WARNING: 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.

CAUTION: When adding coolant, it is important that you use GM Goodwrench Dex-Cool(R) or Havoline(R) Dex-Cool(R) coolant. If coolant other than Dex-Cool(R) or Havoline(R) Dex-Cool(R) is added to the system, the engine coolant will require change sooner; at 30,000 miles or 24 months. The air bleed valves are brass. Do NOT over-tighten the air bleed valves.

NOTE: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do not pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound.

CAUTION: Avoid spilling coolant mixture on engine parts. Coolant may cause undue corrosion. If coolant is spilled during procedure, rinse area with clean water.

Ensure the radiator drain cock is closed. Remove the radiator cap. Open the air bleed valve on the thermostat housing 2 full turns. Open the air bleed valve above the water pump 2 full turns. Slowly add a 50/50 mixture of GM Goodwrench Dex-Cool(R) or Havoline(R) Dex-Cool(R) and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.
Wait for 2 minutes and reinspect the level of the coolant in the radiator. If necessary, add coolant to the radiator until the coolant level is at the base of the radiator fill neck. Install the radiator cap. Ensure that the radiator cap arrow points toward the radiator overflow tube.
Close the air bleed valves above the coolant pump and the thermostat housing. The air bleed valves are brass. Do not over-tighten the air bleed valves. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench Dex-Cool(R) Or Havoline(R) Dex-Cool(R) and clean, drinkable water.

NOTE: If the coolant temperature indicator turns ON, turn the engine OFF immediately and allow the engine to cool. Do not remove the radiator cap.

Start the engine and allow the engine cooling fan to cycle on and off 3 times. Turn off the ignition. Allow the engine to cool. Ensure that the engine coolant concentration is sufficient. Top off coolant reservoir, if necessary.