Sensor Hot

Where is the thermostat located on my 1985 , 175 HP Evinrude ? Where is the sensor for the hot horn located?
I've been asked why I want to know this. My trim motor quit working a year ago and my engine was running fine at the time. I bought a new trim motor off ebay but didn't put it on for a year. After I fired up the engine after it sat for a year, with water hose ear muffs connected to the engine, I let it idle for about 5 min and then the hot horn started buzzing. I let it cool and then stuck it in the river I live on just to see what would happen. I drove it about a mile with plenty of water coming out of the P-tube and the hot horn came on again. By the time I got back to my trailer, The water coming out of the P-tube had turned to steam. I loaded it up, called a friend of mine, and he put a water pump in for a hundred bucks. He didn't test it when he finished, but I did as soon as I got home with the water hose ear muffs. Once again in a few minutes, the hot horn came on. So now I am looking elsewhere for the problem....hoping its a stuck thermostat or something easy. Thanks!!
Mike T has this covered, but I'm wondering why you are asking......These components seldom fail. It's almost always the impeller or it's housing, that cause overheating.
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