Problem with temp dial (08 Elantra)
 

I couple months back I started having issues with the little dial that changes the temperature on the AC button from heat to cold. It was working fine except for when I would switch over from cold to hot it would make a buzzing sound for a few seconds.. Then at the end of the winter time I went to switch it back so I can turn my air conditioner on and stop working and it stuck in the heat mode... So now even if I turn the air conditioner on blast it's still just very hot air coming out ... And I don't think it has anything to do with the air-conditioning because even when I have just the vent going on a cold day outside it's still hot air coming out... Is there any type of fuse that controls this dial or a way I can replace it myself??? Appreciate any help I hope my post made sense