Drain the cooling system (see Coolant Draining).
Fill the cooling system with fresh water mixed with a flushing compound.
Caution! Do not use a flushing compound which is harmful to the aluminum engine and radiator. Carefully follow the instructions supplied by the manufacturer of the cleaning product.
Warm up the engine, and run it at normal operating temperature for about ten minutes.
Stop the engine, and drain the cooling system.
Fill the system with fresh water.
Warm up the engine and drain the system.
Repeat the previous two steps once more.
Fill the system with a permanent type coolant and bleed the air from the system (see Coolant Filling).
Coolant filter cleaning
Refer to the chapter of carburetor in Fuel System for the cleaning procedures-