Cooling System Flushing
Over a period of time, the cooling system accumulates
rust, scale, and lime in the water jacket and radiator. When
this accumulation is suspected or observed, flush the cool-
ing system. If this accumulation is not removed, it will clog
up the water passage and considerably reduce the effi-
ciency of the cooling system.
Drain the cooling system (see Coolant Draining).
Fill the cooling system with fresh water mixed with a flush-
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
Warm up the engine, and run it at normal operating tem-
perature 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).
COOLING SYSTEM 3-11