The system has its own cooling, right? The first generation had it's own water pump, separate from the engine, so that the system would be cooled even in start/stop mode. So you think any such system would require that? Seems like a DIY without some cooling system would get mighty hot, as Oilpan4 says above. A separate cooling system really increases the complexity and cost a bit, no?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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