That orange and blue "Echlin" box suggests to me that those "heaters" are really dropping resistors used to reduce the speed of a car heater blower motor to Lo speed vs. Hi. Of course they'd be placed near the heater outlet duct and would add to the overall output.
The title of this thread caught my eye immediately but I decided that having another woman in my life would
just make things too complicated.....................................................Sorry...
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