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My heater fan on the highest setting is drawing over 80 watts, so not quite as much as the head lights but it's getting close, also some cars do turn on the A/C at least for defrost to help dry the air.
Was the drop instant? if it was then I would think that the drop would be from an electrical load, but if there is a lag time then it's from the fact that it's pulling heat from the engine, the jump back up with an electrical load should also be instant where a cooler engine again will have a slight lag time, maybe 30 seconds or so?
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