I don't have a DIY, but this is a pretty easy fix. You gotta take off the driver's side under-dash padding. Then take out that metal knee-bolster.
Get a flashlight, because this part sucks. There is, on the HVAC case (by the firewall) a small brown plug. IIRC, it's square-shaped, and has one 4? prong connecter on it. Unhook the connecter, and give a gentle tug on the brown square. That's the resistor pack. Installation is the reverse of removal.
You might want to give a closer look at that connector, I can't remember off-hand whether there is a clip that holds it to the HVAC case or not.
Hope that helps!