domino effect
 

so a 1998 buick lesabre 3.8 heat and air condision the dash controler is fine the resisor is new but blower stil works intermitently . shuts off and comes on will stay good for few days then out of blue wont blow but heat very lightly comes . anyhow with new resistor and good dash control will the internal electronics of the motor be he prob

Your blower motor is letting you know it's on it's way out. When it doesn't work try tapping it with something. If it starts working then it's just worn out inside and need to be replaced.