Q: Q: cooling fans not coming on

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I have replaced the cooling fans, cylinder head temp sensor, thermostat, fuses and relays. The van doesn't overheat while driving with no fans. The fans come on when I unplug the cylinder head temp sensor. I know the fans cool the ant freeze and the auto transmission fluid and the oil. Its very odd and I'm stumped. Any help would be greatly appreciated. Thank you.

My car has 68000 miles.
My car has an automatic transmission.

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