I have the most annoying whistling sound coming from my heater in floor mode. I have had 2 other cars checked on the lot and they do the same. Wondering if anyone else has this problem. Maybe you do but didn't notice. I told the service at Honda along with my 15 other issues, but they concluded that the other 2 cars on the lot does it, so this annoying whistle must be a new unwanted feature on all new Civics.