no ac/heat working for 08 hyundai sonata

Hello, sounds like some kind of issue with the blower system - the fan inside the vehicle. It could be a wiring concern, a blower motor concern, a relay, a switch or a lower motor resistor -- which is a likely first place to look because often times, a failed resistor will only allow the system to blow at high speeds. Seek guidance at a local shop near you -- Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops