Random Noises Long After Vehicle Turned Off

[Steve5472]

So I've been camping out of the back of my 23 Expedition (Stealth Performance) and notice that at random times, for about an hour after the vehicle is turned off, it makes all sorts of weird noises. To my untrained ear it sounds like different motors or hydraulics or something. They seem to come from different areas of the vehicle as well. Probably a dumb question but I'm curious. Thanks!

 

[2020-MAX-Limited]

Could be fuel vapor capture systems (emissions controls). Our 2016 Toyota does this.