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Cooling water test

L

Larry King

Guest
" I bought my first boat last

" I bought my first boat last year with an old Merc 470 I/O; 4 cylinder aluminum block and fresh water cooling. I have kept it in the water all winter in the NYC area. A few weeks ago I took it out on a pretty cold day and it overheated. I wonder if seawater may have frozen or partially frozen in the raw water system. The seawater hoses felt cool but not really cold. My question is: Is there any good way to check the raw water flow with the boat in the water, since there is no tell-tale as there is on an outboard? "
 
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