sorry for askin' a common question..but i did a search an didn't find much..<br /><br />new model40 hp nissan<br /><br />had it out the other day & no water commin' out the pee hole but ran great as ever. no signs of overheatin'<br /><br />is it needed..?? what's the science ..??<br />is there an important corrilation..??<br />whats up..??