how to replace fan switch on dash

Dash trim is usually retained with many screws and clips, some may be hidden like around the gauges, so you need to be perceptive to find them all. Once the trim is off it should be easy to replace the switch. Use care and be patient in order to not break any plastic parts. Sorry I can't be more specific, I'd need to be able to see it. If you want to find a specialist, here's our directory link for you: https://repairpal.com/hyundai-repair-in-crownsville-maryland