I'm willing to bet it is the blower resistor. Less than 20 from Amazon. youtube video will show you how to replace.I've done so many I can do it in ten minutes now. Very common in TJ'sSo I am finding alot of issues with this new to me TJ, the blower motor does not work at the first two settings, but does work on the 2 highest settings.... Any ideas? Switch, wiring, blower motor?