HVAC Blower Motor Resistor. 1997 Ford Econoline Super Duty w/ AC; Position: Front;. 1998 Ford Econoline Super Duty w/ AC; Position: Front;. 1999 Ford Econoline Super Duty w/ AC; Position: Front;. Our plants are TS16949 and ISO9001 certified which ensures that every part is the right part for the right vehicle.