Engine Cooling System: Engine: Cleaning

Drain cooling system and refill with clean water. Refer to STANDARD PROCEDURE drain and fill procedures. Run engine with radiator cap installed until upper radiator hose is hot. Stop engine and drain water from system. If water is dirty; fill, run, and drain system again, until water runs clear. Refill cooling system with a 50/50 mixture of the recommended ethylene glycol and distilled water.