Flushing Procedure
Radiator Restrictions
A dirty, obstructed, or leaking radiator core causes overheating. Scale deposits result from using hard (high-mineral) water in the engine cooling system. Heating these minerals causes the formation of a hard coating on the surfaces within the radiator. Scaling reduces the transfer of heat. Some hard water produces a silt-like deposit that restricts the flow of water. A radiator that is partially restricted should be removed and cleaned by a radiator repair specialist. Replace a radiator core that is plugged or has a heavy scale.
Tools Required
GM Approved Engine 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 engine coolant into the sewer system or ground water. This is illegal and ecologically unsound.
There are various methods and equipment to flush the engine cooling system. If special equipment is used (such as a back flusher) follow the manufacturer's instructions.
Important:
• Remove the coolant thermostat before flushing the engine cooling
system. • Dispose of the used engine coolant properly. - Store the used engine coolant in a used engine coolant holding
tank, while awaiting approved disposal methods. - Never pour used engine coolant down the drain.
• • Ethylene-glycol based antifreeze is a toxic chemical.
• • Disposal of engine coolant into a sewer system or contaminating
the ground water is both environmentally irresponsible and illegal.
Engine Coolant Recycling
Whenever the engine cooling system needs maintenance or repairs, remove and replace the engine coolant with new engine coolant.
Important: Do not use recycled engine coolant on vehicles manufactured with GM Goodwrench DEX-COOL®.
- Recover the used engine coolant.
- Store the engine coolant in a used engine coolant holding tank.
- Submit the used engine coolant for recycling on a regular basis.
