Originally Posted by Sydwayz (Post 4920274)

There are lots of posts on this over the years.
Antifreeze is only good in these motors for 7 years, tops. As soon as it starts to turn dark, it needs to be drained and replaced. When it's dark, it is silting up.
Definitely need to open and clean the heat exchanger, and replace the end rubber gasket caps as a maintenance item. The pic above indicates how they create blockages.
How old is the seawater pump impeller? Is it flowing even water out of both exhaust tips? Your SWP impeller could be shot. Your SWP could also have wear not allowing enough water pressure for cooling.

Once you have done all of the above, report back.

Originally Posted by ashipshow (Post 4920275)

He already said in his original post that he replaced the sea water pump and has flow out the exhaust tips....

Originally Posted by MagicPowerboats (Post 4920122)

Did you ever figure out the issue?