Engine Cooling System: Flushing

NOTE: Many vehicles use an aluminum/plastic radiator and aluminum and different alloy materials in engine block, heads and gaskets. Ensure material used for cleaning and flushing is compatible with these materials.

Back flushing is an effective way of removing scale and rust from cooling systems. Radiator and heater core should be isolated when flushing engine to avoid plugging cores with scale and rust. Remove thermostat before flushing engine. If power flush equipment is used, refer to equipment manufacturer's operation instructions to avoid cooling system or equipment damage. Replace thermostat after flushing is complete.