Hello,
The coolant overflow bottle on my 2003 5.7 carb bravo with a closed cooling system has been slowly filling with each heat cycle. Several times, ive set the coolant level at the cold mark, run the engine several times over a weekend, and after all has cooled down i have more coolant than i began with. When i check the heat exchanger for coolant it is full and under pressure. This must be seawater displacing coolant and mixing in the system. I don't have overheating issues, and the engine runs smoothly. I suspect an internal heat exchanger leak that somehow only leaks from the salt water side into the coolant, but not the other way around. I say this because i don't have overheating issues, the system holds pressure, and ive pressure tested the coolant circuit to 15-20 pounds. I have a dryjoint manifold exhaust system and wonder if that could be a leak path also. Has anyone had a similar experience? Thank you for your time.
The coolant overflow bottle on my 2003 5.7 carb bravo with a closed cooling system has been slowly filling with each heat cycle. Several times, ive set the coolant level at the cold mark, run the engine several times over a weekend, and after all has cooled down i have more coolant than i began with. When i check the heat exchanger for coolant it is full and under pressure. This must be seawater displacing coolant and mixing in the system. I don't have overheating issues, and the engine runs smoothly. I suspect an internal heat exchanger leak that somehow only leaks from the salt water side into the coolant, but not the other way around. I say this because i don't have overheating issues, the system holds pressure, and ive pressure tested the coolant circuit to 15-20 pounds. I have a dryjoint manifold exhaust system and wonder if that could be a leak path also. Has anyone had a similar experience? Thank you for your time.