If the a/c compressor cools the air coming from the vents, and the heater knob makes the air hot, but the fan switch doesn't change the speed of the air coming from the vents, most likely the culprit is the fan switch itself, the blower resistor, or the blower motor. With smoke being present, there's a good chance the blower motor burned up.
I got a 1997 explorer sport with control trac 4wd. its suppose to but it doesnt work.
Check the blend door motor/mechanics or heater control head
bad brake light switch
Blown fuse, bad motor, bad blower motor switch, or a defective Blower Motor Resistor Pack.
The control is the group that doesnt get tested
if it doesnt work on 1 and 2 it could be a blower motor resistor but if it doesnt work at all check the fuses, relay and check voltage if it reads 12 v replace the motor
Bad blower motor? Blown blower motor fuse? Bad fan switch? Bad blower resistor pack?
Resistor or blower motor power module.
take it to a game store and have them troubleshoot it....if that doesnt work buy and new one and get more and better codes. 8)