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The computer. Controls the ground signal going to ur relay u should have no ground on the relay till computer sends the sivnal cheak that if u already did fuses .and relay the ground should. Be a green wire if u don't get ground install an independant fan setup its a setup that turns ur fans automaticallly.I forgot what its called that will kept u in junkin the car

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Q: Why wont your fans turn on you checked the relay and the fuses and still the only time it turns on is when you have the ac on it gets hot but still no fan?
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