Air vent continues to blow and I can’t turn it off with air knob?

Hello, often times a blower speed controller or blower motor resistor (one in the same kind of) is in charge of turning off and on the blower motor for the ventilation system -- and regulating the speed. I'd focus my attention in this area, although it could be many things. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops