Gentlemen, I have a Mercruiser230 Chev 305 with a Alpha 1 lower unit. Had it started up, water running though all the lines with the muffs on, than, all of a sudden it overheated and I cannot get water from my muffs back up to the T stat housing. Impeller maybe? Can it just "Go bad" all of a sudden like that? Also, I am not confident that the cooling lines coming and going from the t stat housing are correct. I replaced the PS cooler this spring and am confident that is not leaking, and it is plugged in correctly to the Tstat housing, with the line going to the engines water pump across from it, my concern is with the lines on the top of the housing, which one where? Any help guys? A diagram of the cooling routing lines would be beneficial at this point.
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