Heater cores blow all the time. I've gone through three or four in my 00' X-Star. When they go, they fill your boat with piping hot water. If it happens when you are out on the water, the only thing to do is to de-loop the heater core. I can now do it in about five minutes. You simply disconnect both hoses going to the heater core from the motor. It goes from being a big water loop all the way to the core to a small loop under the motor. Difficult to explain but very easy to do. Replacing the core is also very easy to do once you have the part. All you need for the job is a drill and some rivits. Just fyi, MC has warranted mine every time but I replace it myself. Saves me the hassle of having to take my boat in.
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