I just fixed my 98 and expect your is pretty much the same. The resistor module is located in back of the blower motor, very close to the firewall. Just follow the two wire connector on the motor. It goes to the resistor module. You'll also see a seven wire connector on the module. It was easier to work on it after I removed the motor but it'd not absolutely necessary. The module has three screws, one in front, two in the rear. Remove the front one ( mine was a 7/32 socket ) and just loosen the rear ones.
You should be able to slide the resistor module out. If it's like mine, it's a printed circuit board with resistor patterns etched into it. Different fan speed switch settings feed power to different resistor segments, delivering more or less voltage to the fan motor and varying the speed ( it's a DC motor ).
I was able to repair mine, but you may not be able to depending on the extent of the damage. The failure mode is pretty simple. Again, if you have the pc "card" like mine, there's a thin green insulating paper attached to the card that's deteriorated. You'll see two small horse shoe shaped pieces soldered to pads on each side of the board. The insulation breaks down and **** accumulates under the horse shoe shaped pieces. Eventually, the etched resistor lines under those pieces are eaten through and they fail with either an open or high resistance ( about 30 ohms in my case - it is supposed to be about two to four ohms for the motor to run ).
If you want to try to fix it, carefully bend the horse shoe shaped pieces up to give you enough room to clean the **** off the board. A toothbrush works great. Examine the resistor lines with a magnifying glass until you find the damaged area. Verify that damage with an ohmmeter if you have one. Carefully solder a small wire across the damages area. That's it. Hook it up temporarily to try it. Or just buy a replacement and put it in. I could fix it because I had the tools and used to do that kind of work.
The part number on mine was 101853. Dorman makes a replacement, check out partsgeek.com. It looks different because they use discrete resistors, not a pc board. Here's the schematic. My wire colors were different but it's basically correct.
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