My Model S LR has this weird 'cooing' sound coming from the ventilation slot on the passenger side of the main screen. Sounds like a small dove caught in the system. Very soft, doesn't appear to be related to fan speed but it goes away when I turn off the ventilation system. Not terribly loud but now that my ear is tuned to it, I hear it over low road noise and low music, annoying. Not a regular rhythm, sometimes few seconds, other times goes away for a minute or two. Maybe an actuator that moves a vent back and forth? I swung by the local service center and demonstrated it to one of the service advisors I've dealt with in the past, he'd never heard this and suggested I record it which I did and have sent it to him. I'm hoping he'll pass it up the chain to Fremont, don't want to bring it in to the shop for them to tear apart the dash for random diagnostics and then have the car stuck there waiting for parts...
put some Rain X on your seat belt.
