No Heat No a/c No Defrost, NO BLOWING AIR

Hey guys was wondering if I could get some help diagnosing a problem I'm having with my 1987 Ford Bronco. After owning her for about 2 months, it just completely stopped blowing air out of all vents, including the defrost, doesn't matter what it's set to, it will not blow any air. So far I have checked the fuses, all are good, the fan is blowing, and the blower motor connector has been checked and if fine, please any and all suggestions are welcome, thank you in advance!

Also, after about 2 weeks of not blowing any air it started to blow air for two days or so and then quit on itself again.