We are having the same issue. It’s in the 30’s here and we are driving with the windows down. The trucks been at the dealership since 12/2 (this time). So far their only fix is to disconnect the battery. 20mins of driving later and we were back to sauna conditions. The service manager today told me they confirmed the car was set at 68, the computer said 68, but the AC was blowing close to 100 degrees.
It’s also got system glitches which seem to be increasing. Not sure if it’s all related but the day to night time transition doesn’t always work ie the map is daytime bright at night and dark during the day. hey Lexus tells us there’s no navigation, it’s super slow almost pixelated when moving between screens/tabs. It’s almost like it’s in cascade failure. While driving long distances we occasionally have to turn the car off and start it again to get things back. Ridiculous!!