I am getting considerable belt squeal when I start up on these cold mornings, and I am assuming it is the serpentine belt.

But every once in awhile I'm getting another separate weird noise.

I can't duplicate it. It has happened once when I started the car, twice while turning, and once while driving straight. It sounds just like a belt squeal but it for sure coming for under the passenger floorboard. It is totally separate from the other one. Is there a belt under there for something? It lasts maybe 5 seconds.