How do you replace a blower resistor on a 2002 Jeep Liberty sport?

To add to this... This initial answer really helped me out for my 2004 Jeep liberty. Let me add a few more details to "give back" to those who helped me out.

I had first taken off the bottom plastic shroud which sits straight up above the floor board

and down below and back under from the the glove box. This was where I was kinda being steered from book I was trying to use to do the replacement of the resistor.

Then I came in and googled and found this pointing me to take out the glove box... from there I saw the resistor mounted into the firewall so took out the two bolts and pulled out the resistor with the wiring harness still plugged in. Then the challenging part at that point was to get the harness unplugged from the resistor. As was mentioned below, it is "non-intuitive" as to how to do this. By flipping over the assembly, you will see a sliding red kind of "latch" which seems to hold the harness plugged into the resistor. I was able to stick a screw driver into the back of that (wiring harness side, not the resistor side) and push it towards the resistor. This seemed to "unlock" things but it still needed some pursuation to finally unplug it.

Also, I'd note that they suggest that you take the negative lead off the battery for this surgery so to prevent any air bag triggering as you are messing around in this area.

Hope this extra detail helps.

I just did this a few months ago. It was pretty basic. You need a new resistor board, first of all. I got mine on eBay for far less than the dealer would've charged. I think there are aftermarket manufacturers of these, so you shouldn't have to pay OEM costs. The resistor device is located behind the glovebox, mounted into the firewall. The glovebox should be fully removed, it will just be a major hindrance if it is left in place. It is fairly obvious where the resistor set is because there is a substantial wiring harness attached to it. This is where my description will get a bit vague because it was so long ago. There are essentially a couple screws/bolts holding the existing resistor unit in the firewall, and there is also some kind of fancy clipping mechanism on the wiring harness. These all need to be removed obviously, and installation is simply the reverse. I remember nearly breaking the harness locking device b/c it was so non-intuitive, but I also think I remember that the lock wasn't essential, i.e. the harness would probably stay connected regardless.