So the heater core and engine block share a circuit and the rad is separated from that by the tstat. I forgot about that. So the inline coolant heater can circulate (by convection) the coolant thru the block with the tstat closed. Potentially much better pre heat than a block heater especially for the cabin air.
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FYI, there is an electric pump in the NHW11 heater core loop.
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Could there be a sweet hack here using the existing inline coolant pump and a
passive inline heater to really warm the engine/heater core loop? This would be much better/cheaper than relying on the convection of the tank pump's bypass system.
I'm feeling warmer already...
Thoughts?
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