New here thanks for any help. I have 1989 four winns liberator powered by a chevy 350 with cobra outdrive.Boat overheats on muffs. I checked the the thermostat was good.I found that no water was coming in from the line that supplys from outdrive while on muffs. I pulled the impellar was replaced 4 mounths ago prior to winterizing looked good.Dont know where to go from here thanks for any help i get

Mike