For a week or two when I turned the heated seat on I would often feel a very intense heat from the seat back when it started up for a period of time. I had just recently had a back injury so I thought perhaps my back was being overly sensitive. Finally on the 27th just after I started driving the car in the morning I felt the burning feeling on my back again and stuck my hand behind me to feel the seat. I felt burning on my hand and pain and yanked my hand away immediately, pulled over, and looked behind me at the seat, in time to see a curl of smoke coming out of a small hole on the back of the seat. I also found that the palm of my hand had a small mark beneath the base of my thumb where I had felt the burning pain. It took at least half an hour for the burning sensation to fade. I also detected an odor of smoke for a bit afterward. I had no warning that this was going to happen other than the burning feeling the heated seat had started to generate upon my back- no warning lights or such. I have not had any service done on the problem yet though I intend to contact Kia soon; so the car is currently in the same state although obviously I don't turn the heated seat on anymore since I don't want things in my car to be on fire.