Flushing Procedure
Tools Required
GM Approved Coolant Exchanger such as Pro-Fill 42-75100-KM (Available through the GM Dealer Equipment program)
Important: Store used engine coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used engine coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.
You can use various methods and equipment to flush the cooling system. If special equipment is used (such as a back flusher) follow the manufacturer's instructions. However, always remove the thermostat before flushing the system.
Engine Coolant Recycling
Tools Required
GM approved Recycling System such as Pro Clean (Available in the GM Dealer Equipment Program)
Whenever the cooling system needs maintenance or repairs, remove and replace the coolant with qualified new or recycled coolant.
If you only drain the radiator, up to 50 percent of the used, contaminated coolant can remain in the cooling system.
Use any of the following methods in order to remove the coolant:
| • | Use a waterless coolant evacuation system, available in the GM Dealer Equipment program, or equivalent, that removes the used coolant and replaces the coolant with new or recycled coolant. |
| • | Use a GM approved coolant recycling system, available in the GM Dealer Equipment program, or equivalent, that recycles the coolant on the vehicle. This eliminates the need for coolant evacuation. |
| Important: Do not recycle coolant on vehicles manufactured with GM Goodwrench Dex-Cool. |
| • | Recover the used coolant. Store the coolant in a used coolant holding tank. Submit the used coolant for recycling on a regular basis. |
