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

I tried finding a schematic at the autozone.com site, but they are a mess. Without one, I can't help you. You may be able to find one that library or just buy a repair manual at a parts store, ebay, etc, I've come to find out fan control isn't as simple as it once was.

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