i know this should be in jeep tech but i thought i would post it here for more help...
my 99 tj's (no a/c) blower motor is not working and i am wondering if anyone could give me some possible culprits and easy ways to home diagnose problem part.

it was working good up until a few months ago when the 3rd speed setting would not blow because the other speeds were fine.i did not get too worked up until it started cutting out for hours/days at a time when on the highest fan setting for just over a few minutes. then a few weeks ago i got in and the blower did not work at all and has not worked since. nothing but the fuses behind the glove box have been checked since then.

thanks