TM10-3930-660-20 7-3. RADIATOR   SERVICE/REPLACE/TEST  (Cont’d) d. Open cap (3) of overflow tank (1) and add two quarts of cleaning solution. Close  cap  (3). e. Slowly fill the radiator (2) through the filler neck with cleaning solution until solution begins to run out of drain cock (5) at top front of engine. f. Close drain cock (5). Continue filling radiator (2) until solution level reaches filler neck. g. Clean seal on radiator cap (4) and install radiator cap to radiator (2). Check for cooling system leaks during step  h. h. Start engine and allow to idle for 1/2 hour. Stop engine and allow to cool. i. Slowly remove radiator cap (4) from radiator (2) and allow pressure to escape. Use suitable containers to catch cleaning solution when draining cooling system in steps j through n. j. Open drain cock (5) at top of engine where heater hose (6) attaches to engine. k. Open drain cock (7) at bottom of radiator  (2). 1. Disconnect hose (8) at bottom of overflow tank (1). 7-5