Alot of people have had problems with the blower motor. The pigtail on the motor will tend to fry itself because the wiring isn't appropriate for the amount of amps that tend to be drawn.
See this link to the other forum for the known problem:
http://www.jeepcommander.com/forums/...otor%2C+wiring
and this one for pictures:
http://www.wjjeeps.com/blower_motor.htm

There is a chance that it isn't this problem but seeing as how it has been a reoccuring one there is a high probability.