Sounds like the thermo-switch is kaput.
The thermo-switch detects the temperature of the coolant and when it reaches a certain level, an electrical connection within the switch makes contact and completes a circuit that sends power to the radiator fan. It the fan runs on, it likely this switch is the problem, so have a look at it first. They are generally not expensive and relatively easy to replace. Good luck.
Most causes are fan switch close all the time, or a bad contact to the ecu.
SOURCE: 1996 Mustang radiator fan constant running
Disconnect pos. battery cable for 3-5 minutes, then reconnect that should do it!!!!!!!!!!!!!
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