My 2004 Honda civic fans won t engage when the temperature goes beyond half?

The fans won t work unless i have them wired direct already change the thermostat and even the fans switch and nothing i know they work because i turn on the ac and they engage normally also even keeping fans on direct all the time when car is running when i drive for about 30 minutes on freeway speeds and then stop at the lights or in traffic still starts to over heat almost to the red what else could it be

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