MD2003, fresh water (closed system)
Tendency to overheat at idle or low R's after about 15 minutes, might not overheat when running >2000 rpm
I thought I was handy when...
I flushed the freshwater system... removed gel jizz out of bottom block drain. Flushed 3 times until clear. Refilled with the silicate free stuff.
R & R heat exchanger with boil out at the hot rod shop
Ran without thermostat
Rebuilt fresh water coolant pump. Might have had an air leak
PLENTY of raw sea water flow. Engine runs just about as it always has.
I need some ideas.
Thank you in advance.