Ted is correct.
An even simpler way that doesn't require removing the hose is to close the sea cock and open the top of the strainer. Start the engine and pour antifreeze into the strainer. The engine will suck it up. Stop when you see a strong pink color out of the exhaust.
If you aren't sure about the antifreeze strength in the coolant side, buy a tester at an auto parts store. If it is too low, then the best way is to remove the thermostat and drain some of the antifreeze. Start the engine and add 100% (not the 50% kind) antifreeze and let it circulate for a few minutes while running a water hose into the raw water strainer. With the thermostat out, it will quickly get distributed evenly.
Then check and if ok, replace the thermostat and do the raw water winterization
David
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