Branson 6640C Operator's Manual page 135

T PERIODIC MAINTENANCE & ADJUSTMENT
Replacement
(1) Open the radiator cap and the drain plug to complete-
ly drain the water from the radiator.
(2) Rinse the radiator with tap water until no dirt or rust
comes out.
For better results, fill the radiator with water mixed with
radiator flush, run the engine for over 15 minutes, and
drain the water solution
(3) Replace the drain plug, add anti-freeze and fill the
radiator with tap water.
(4) Replace the radiator cap and run the engine to mix
the anti-freeze and water.
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6640C OPERATORS MANUAL (012612).indd 135 1/30/2012 2:31:06 PM