After losing the fan speed on the lower two settings, I researched this forum and learned how to replace the blower motor resistor. I used this thread for the procedure: http://www.jeepforum.com/forum/f9/bl...05-lj-1048567/
BUT: How do you determine if the resistor is bad before replacing it? The field service manual says to test the resistor by checking continuity between all of the pins. This can be done before removing the resistor. You first need to uplug the wiring harness (which is a pain). Then check continuity between each and every pin.
There are 5 pins to test
Sure enough, the one I removed did not have continuity with two of the pins The new one I purchased at the stealership this morning ($25) has continuity amoung all pins.