Sounds like the temp. sending unit for the fans has gone defective or the connection to it has come off. You have two temp. sending units, the other for the temp. gauge in the dash. Both would be located near the front of the engine. Disconnect one of the two and check to see if the temp. gauge is still reading a temp. and if not, it would be the other sender. To check the sender, simply run a ground wire to the wire connection and if the fans come on, the relay is ok and replace the sending unit. If the fans do not come on, then check and replace the relay. If you want to add a manual fan switch so you can turn it on when you want, simply install a switch in the dash and run a wire to the sending unit wire for the fans and the other wire to ground.
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