Cooling System Maintenance: Flushing

CAUTION: Some manufacturers use an aluminum and plastic radiator. Flushing solution must be compatible with aluminum.

Back flushing is an effective means of removing cooling system rust and scale. The radiator, engine and heater core should be flushed separately.
To flush radiator, connect flushing gun to water outlet of radiator and disconnect water inlet hose. To prevent flooding engine, use a hose connected to radiator inlet. Use air in short bursts to prevent damage to radiator. Continue flushing until water runs clear.
To flush engine, remove thermostat and replace housing.