I have a 2004 tj and the resistor pack is behind the ducting in the glove box! If you follow the wires from the fan switch you will find it. I had to use a 5/16 inch end wrench to get it out, but it was easy once I found the dang thing, took an hour to find it. If the resistor pack looks like mine and has a big flat part on it, the flat part goes inside the fan housing, and therefore is hard to see. Good luck.