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)
2002 Excursion, 4x4, V-10, XLT, RS9000 shocks, true trac diff, 08 alum diff cover, interior light delete, 08 power fold/xtend mirrors, KM2 tires, 5 Star tuned, front cryo powerslots with hawk pads, XRF ball joints. 50" front mounted LED bar, 10" reverse light LED bar. Banks stainless long tube headers and exhaust kit., front seat heaters.
2011 Expedition, Ltd Max, 4x4. 30" LED light bar, flip key fob, 9 passenger, more to come.
Check for voltage at the mirror before you give up on the heating element. Did you use later stock mirrors or aftermarket ones?
Jock - 2001 F250 Reg. cab 4X4, 7.3L with CCK, auto, 315,000 mi., homebrew pw and pdl, heated towing mirrors with a timer. Stahl Grand Challenger Utility Box, Ride-Rite Air Bags, Big Rear Sway Bar, Walker BTM + Resonator, ATS Intake/Air Cleaner, headlight relay system with daytime running lights.
Honoring Robin Hurt - Payson PSD. Robin, we'll visit again when I catch up with you!
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