The heating element is added to the back of the mirrors, so you could replace the mirror with a new one that would have it on. I think you might have a different problem though. It is quite rare for the element to go on them. I would check the wires and all connections starting from the mirror. Or pop the switch, and the connection at the mirror and see if you have continuity thru the power lead. And then check to the mirror end from the plug. (You could have a frayed wire somewhere or the connections just loosened off)
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