Ever since I got the car in August 2020 2.0T my rear defrost has not worked properly like my AcuraRL. Although it appear to work very slow. It take about 5 to 15 minutes at best would heat up slowly. when I turn rear defrost on also. The rear window appears to have been tinted but not totally sure. Bring it to dealer for check. The service guy said it work slower than other cars but he said it fine. I don't know? I wait until Nov, December if still not working properly I will bring it back.