FirebaseD...excellent job!!!
I have the exact same noise. It comes and goes. When it is making the noise, turn the fan on low and it goes away. Of course it never does it when I want to so I can't complain to the dealer. My brother is the GM and that does nothing for me when it comes to service. I will probably replace it myself when it gets bad and force Chrysler to pay for the part.

My son says it is like a popcorn popper.