There are only two controls to run the fan. The fan temp switch on the engine, and the AC control which will run the fan all the time if the AC is on or controls broke.
So unless the fan relay is stuck closed I'd pull the connector from the temp switch or play with the AC controls to see if it stops.
You could also tap on the fan relay and see if it releases if stuck. It should be in front of the left headlight bucket to the left of the radiator I believe.
[This message has been edited by Dodgerunner (edited 04-21-2008).]