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I connected an LED with a series resistor to the fan side of my fan relay, and stuck it in my dashboard. when my fan kicks in, it lights up. Being hooked up to the fan side, it also lights up dimly when wind makes the fan spin due to highway speeds. I have a 02 Civic Si, and in warm weather, it doesn't like any grille blocking. The fan comes on too much. Without grille block, in the summer as long as I dont get stuck in traffic, the fan never comes on.
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