Fan for Heat, Air, Defrost, will not come on on 1992 Ford Taurus

For a couple of weeks, the fan for my heat and air would not go off unless I turned the car off. Now it won't come on at all, so I have no heat, defrost, air, etc.

Asked by for the 1992 Ford Taurus
Sounds like a heater blower resistor and or wiring connector has failed.