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Interesting idea. You need to plumb your sensor not only after the tstat, but after the radiator as well. You want to know how hot the coolant is before it goes in the motor, not after the fact. This will give you a little safety factor. You also need to allow for overlap in the temps. In other words, door opens at 220 degrees and closes when at 210. Otherwise, hysterisis will take place and door will get "confused".
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