When I had my squeak it was high in the seatback & sounded like a squeaky mattress or recliner. No plastic noise like 79 describes. But based on the location I see no correlation whatsoever with the heated seats. I use mine often. I will say that the squeak was more prominent the longer the drive. So the springs/frame warming up may have contributed to the squeakiness but I don't think the heated seats cause the issue. Similar to some rattles that only come out in the cold when the plastic is more rigid, with the heat it's the opposite in these squeakers.