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Hello, my name is***** will assist you.
Jeff has been inactive here on the site for two months. I can assist you if you wish.
What motor are we looking at?
Do you have a water pressure gauge in the dash? A picture would help.
You have a fitting on the adapter plate under the cylinder head. It goes up to the top of the cylinder head with a small T fitting inline. The output of this T fitting goes to the overboard indicator, the "pee" fitting. It's had to tell from your picture exactly. Does this make sense to you?
The only reason for a hose going into the boat is a water pressure gauge. You say you don't have one? What kind of boat is it?
There are 3 main components of the cooling system, the water pump, the thermostats and the poppet valve. I recommend replacing the impeller in the pump every other year unless used in harsh conditions. The thermostats every few years and the poppet valve every 5 years.
Check that line again as make sure it goes from the adapter plate up to the thermostats with the pee hose T off it. Forget any hose to the boat.
If your poppet valve or impeller are old, replace them right away. You can get kits for both at any marine store. I would check the pump first as you may not need a whole pump but just the impeller. If any burning, rubber transfer inside, then get a new pump kit.
Let me know if you need help. Thanks