They also appear to be on all the time (are hot to touch after a few mins of the engine running)... Thought that they would have only come on when the rear window demist was on?
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There's nothing more satisfying than seeing the car behind you vanish into a cloud of smoke...
All MGR vehicles fitted with electric mirrors also come with heated mirrors that come on with the ignition, it is much easier to wire the heater part in with the ignition than with the heated rear screen.
However the N/S on my ZS and the O/S on the ZR don't work, I've yet to check it out but I suspect that it is faulty elements on the back of the glass.
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Former custodian of the legend that was FE54 - RIP