I will admit right here that it took me a few years of performing the coolant level "dance" with my two FL120s before I got smart and added the American Diesel coolant recovery bottle and double acting radiator cap filler neck kit. What a difference in the ability to actively monitor the coolant status during both operation and post operation of the engines. I urge anybody with an unmodified FL120 the make this most sensible of changes.
FROLIC (2005 MainShip 30 Pilot II)
Panama City area