After traveling for 9 hours over a 2 day period from the hudson river to the long island sound just as I picked up my mooring at the end of the trip my engine overheated. How Do I check if I sucked in a plastic bag or my impeller went bad. Is the impeller located by the seacocok. Excuse the stupid questions as I just got the boat and am not too mechanical?Thanks for your help.Richard (Duke)