My 2018 C43 coupe is making this odd whining noise from the grille area hours after being parked. Any ideas what this could be?

Here is a short video I took of the sound

I don't know what it is but mine makes the exact same noise only for 10 seconds.

Car alarm on or car being worked on other day, noise disappear after awhile but never on for 1+ hours.

Time for a visit to the service department and do let us know where and what the noise is.