More than likely the rubber seals in the transmission are dried out from age, the cold weather has made them shrink even more and that has caused a loss of hydraulic pressure to the clutch pack drum, it will most likely start working when the weather warms but in the end you will likely need an overhaul of the automatic transmission. The heater only heats the engine block not the transmission, so the heater being left plugged in makes little difference..
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