Here's an article on how to repair them. You can choose if you want to go this route or just buy a new resistor pack. Read carefully and do at your own risk.................that's what i thought at one point, but what else could it be? that's why, another reason i wanted to know how (if ever) i could fix the ones that i got, was to make my troubleshooting easier.
VWvortex Forums: DIY: repair blower resistor pack for $1.20.