I have twin Mercruiser 260HP FWC inboard engines. The port engine <br />has always run hotter than the starboard, even with a new raw <br />water pump. Sometimes, at idle, it will overheat in just a few minutes <br />... and the antifreeze is foamy. Lately, on startup when the engine is <br />still relatively warm from a run, I smell antifreeze coming from the <br />exhaust. I suspect that the heat exchanger is leaking and allowing <br />antifreeze to seep into the raw water system.<br /><br />Is there anything else that can cause the fresh and raw water to mix?<br /><br />Thanks for your help.<br /><br />Nick
