With 120vac getting to motor, it being HOT when it turns off early, wheel being hard to turn and it making sounds, most likely seized bearings .
Will be back in office later this evening if you would like a price quote and ordering info for a new motor.
Is it heat only or heat and a/c unit ?
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?