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It would seem to me a good idea to have the WP start running very slowly, part way into the heating cycle.
I suspect that EWPs will eventually become standard equipment on all vehicles as they are quite simple and a more efficient way to circulate coolant.
BTW, What is PWM? I assume it is pulse width modulation? I would guess that probably is the most efficient way to have variable speed from a 12VDC motor.
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