Thanks guys, I just got back in from tinkering around. I removed the glove box so I could get a better look. I ran the air fans a bit to listen for servo clicking or popping and nothing there. Removed the cabin air filter and while a little dirty in there did not see any debris. However I found the plastic "drawer" that the cabin air filter sits in felt a little loose when inserted. So I'm doing the felt test by putting a piece between the drawer and the blower to tighten it up how it sits in there. It's on the outside so it wont get into the fan. I'm wondering if air is causing it to move around at highway speeds. If it happens again Ill remove the glove box and go for a drive to see if the sound is more prominent.