Since the time I purchased the vehicle it has always been of some sort of slight issue that was a bit of an annoyance seeing as how when I purchased it it was only a couple of years old and still under warranty. But when I brought it to the attention of the Hyundai dealership at which I bought the vehicle I was told that, that is normal therefore nothing can be done besides rev the engine whenever at a stand still to remedy the warm air blowing until the car can be put in motion. Well, when I lived in Utah I could tolerate it not working at its best because the majority of the season is cold weather, but I now live in Las Vegas where it is significantly hotter, and for longer periods of time and my sonata is midnight black exterior, also full black interior and dash so it can become miserable I tinted the windows to help with the heat but its still miserable the vehicle will get no cooler than just muggy and warm I avoid driving the car whenever the sun is up, its really frustrating to not have the best ac in your car when you live at the gates of hell and its constantly hot.