Try purchasing a new blower. There arent that expensive. If it comes on and off, the brushes inside the blower are bad, and you need to replace the blower. Or you may have some kind of constriction in your HVAC system which would cause you to hear the blower coming on, and no air being produced through your vents. Or another possibiilty could be that you have something under your dash constricting the blower from getting air to move through your vents, or maybe your filter needs to be changed. There is a filter on your blower. It may just be very filthy preventing any air from coming through. If you are trying to avoid buying a new blower I would suggest not running it again until you find the problem (more than likely one of the ones I listed) that could be causing you not getting any air to push through your vents. Hope this helps you.
The AC system is charged?
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