Weird noise.

So at the end of the day I pull into my driveway, park,and turn the tundra off. And sometimes I just sit in it for a bit before going in the house. And I've noticed that about a minute or two after I turn the truck off there's this mechanical whirring sound that sounds like it's coming from the dash area. It doesn't last long just a second or two. Any ideas what it is?

 

It's the AIP system purging air from itself. All the 2013+ trucks do it. Normal thing, nothing wrong.

 

Ok thank you.