Is it possible the second new heater core leaks within a year? I put in a new one a year ago and noticed the smell and sure enough when I pulled it, I could see a little spot where it was leaking. Put in a new on and lately the heater has been giving off that distinctive smell again. I pulled the new one last weekend and didn't see evidence of a leak, put it back and I still get the maple syrup smell when I turn on the heat. They aren't cheap but I am tempted to buy another. What else could it be?
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