Doesn’t sounds good, if you have to turn on the defrost mode means heat comes up and make your windshield foggy…I'm experiencing the same issue here in Spain with a Macan 4. It’s not smoke, but there’s an ugly burnt smell when the heater is set above 23°C on the highway. Now at the dealer. I also had to constantly turn on the defrost button. Any updates on your Macan, @piter95