This is most likely the mode door actuator. This is the actuator is responsible for moving the door that directs the air to different vents.
I attached the process for changing this out. As for the fuzzy pieces, that could be a number of things. It could be the foam that is on the doors to soften the sound when the reach the stopping points. It could be stuff that a mouse put in there as well so it is hard to say. Can you get a picture of it and we will try to identify it.
Let me know if you have questions. Thanks
Images (Click to enlarge)
Tuesday, July 21st, 2020 AT 4:38 PM