so today as I continued waiting for “the canvas man” to appear, I discovered that the leaking antifreeze was more than it appeared. My mechanic finally showed up after an early morning call of desperation, and he showed me how to remove the heat exchanger, so, off it came. What a mess…………antifreeze everywhere. as it happens, Hansen Marine had a heat exchanger sitting on the shelf–been there a while, I guess. Sounds like it is the right one, and it will arrive tomorrow to the tune of $1500.00.