A great idea, I am in the process of installing a different variable, 7 speed fan controller with an automatic climate control, which I believe will not get as hot as the resistors from an 97-03 grand prix in the following post:
Topic: Digital Automatic HVAC install http://www.fiero.nl/forum/Forum2/HTML/099304.html
Fan speed controller out of car
Fan speed controller in car
The A/C braket was modified to allow unit to fit up higher, and a stainless steel plate built to attach fan speed controller to, as well as the hole enlarged in ac housing for the heatsink fins to slide into.