The knob for the A/C can not handle the amperage when in the 4 position, it gets too hot, melts, and shuts off the system. It is available for inspection. Hyundai is acutely aware of this problem and recalled it in other years, the same as their junk engines, but once again the owners of the 2013 are left out in the dark. This is a fire hazard that the manufacturer is trying to sweep under the rug, there are service bulletins out on it for other years.