Blower Motor Only Runs In Low
WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.
Check blower switch. Check wiring for open circuit. Check ground circuit for open circuit. Check for open blower motor resistor.