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Old 06-09-2011, 03:53 PM   #90 (permalink)
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Originally Posted by davidgrey50 View Post
I'm new around here, so excuse me if this idea has already come up. It strikes me the only time you'd want the grille door open is at a high coolant temp, which is exclusively a problem at low speed, and that you'd want it closed at lower coolant temp, which would generally occur at higher speeds. So hows about a nice simple spring-loaded flap which would stand open at low speeds and push closed at higher speeds?

A little experimentation with spring rates would allow opening and closing at a desired temperature.
I know there has to be a simply engineered solution I'm missing, but how do you get a spring-loaded flap to open under low pressure and close under high pressure?
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