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I think you have a switched ground system and something or somebody has defeated the temp sensor, so it is grounded always and the fans always run. Get a volt meter for as little as ten bucks so you can check polarity and see if voltages are present to be able to check things out.
Vettestr is most likely correct with the above statement. But if you do have a relay, make sure that it isn't closed all the time, either by burned contacts or another ground feeding to it. Also it is possible as this happened to me once that the temp sensor can go bad and short. I found my problem in about 10 minutes with a volt/ohm meter and just replaced the sensor and that was the problem. I also had a manual switch but it was ok.
Ron
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