blower motor control module

Quick question. Son has an old 2000 Grand marquis The blower stopped working. have checked all fuses and everything else. Seems it is the EATC was told hard to get at and kid does not have 70.00 to replace. Could I run a wire from the blower to a new rheostat switch mounted on the dash somewhere. that way he could turn on defrost and turn new switch to lower or high. any ideas if this would work. I already have a switch and wires thanks