I have been dealing with this noise on my 2004 Silverado for 8 plus months now. I believe I have it tracked down to the air recirculation / fresh air intake motor/ actuator. When the noise begins, I can temporarily get it to stop by pressing the air recirc button. I dropped the glove box a few days back and was able to see the door opening and closing. The door seems to open and close smoothly, but does pause briefly( maybe a second) before closing all the way. The noise occurs when the door fully closes or fully opens. After opening or closing, a few seconds will pass before you hear the noise in the video. I have done some reading on this and most of what I have read says the dash needs to be removed/ lifted to replace this part. Being a graduate student and working full time, I really don't have the time to pull the dash. I received 2 quotes from local a/c shops. One for $350 and one for between $200 and $550, depending on them diagnosing what motor/ actuator they find causing the noise. Few questions I could use some help with here. Can this be unplugged to get the noise to stop? Can I replace the part without pulling/ lifting the dash? It did look awfully tight behind the glove box. Is there an easier way for me to fix this? The video below is me toggling the switch back and forth a few times. The video is sideways. My apology but i was laying on the floorboard trying to get a better view.