I took delivery of a new P100D in early March, traded in a 2015 P85D I had. I noticed that there is a constant chattering fan noise that seems to be coming from behind the dash somewhere. it sounds like a computer CPU cooling fan. I can't hear it when I'm on the freeway or when the radio is on, but otherwise it's a quiet car and when I'm driving i can always hear it and it's annoying and persistent. Incidentally, it's only starts up about half a minute or so after I get into the car. I took it Tesla service and they say they can't help me because it's just the way it is. Not a safety issue, and it didn't trigger any alarms. They insisted that other Model S/X have the same noise, but I never noticed it on my older Model S. So I went home without resolving the fan noise. Unfortunately I missed the cut-off for the new Intel based MCU, and I have the older Tegra system. I don't know if that's related to this or not. I'm not an engineer or anything so I wouldn't trust myself taking the car apart to check or replace the fan, etc. Searching the forum, it seems other people have had issues with other fans, but service seems to have fixed those problems and I can't tell if those are the same fan noises I'm having. Am I the only one who is annoyed by this persistent chattering fan noise? I would have thought there'd be more posts about it.