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Last night I investigated further where how to wire fan in a way that is stealthy and easily reversed for smog. I think the ECU itself might be the "temp switch" reading the coolant T and deciding when to send power to the fan (maybe). Right now, I am considering using the wires I connected directly to the battery for my onboard charger. They must be live all the time. Smog has never protested them, and I would avoid cutting into OEM harness. Only cut I want to make is to the radiators connector side,if possible.
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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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