Squeal with air on

Hey- Turned air on today, No ac, and got a slight squeal from what seems to be the other side of glove box. It sounds like a "mini" belt squeal, but not noticeable from outside. AC on did not affect the noise. Went away but returned. Any thoughts are appreciated.

 

You ac belt is slipping or loose. Tighten it up or replace it.

 

AC was not on, only fan. When I turned ac on/off it did not affect the noise. Would it still be the ac belt?

 

Was the vent on the passenger side closed? I know on my truck if the vent is closed it whistle, and whines.

 

Thanks- I'll rip it apart tomorrow. Now to the squeak driver's side dash.

 

Just fixed my HVAC blower fan noise tonight thought I'd throw in my $.02.

My problem abruptly started when i decided to engage the "recirculate air" button while my heat fan was on high, throwing something loose and causing an obnoxious noise that got louder with fan speed. Best way to describe it was like a high-pitched and high-frequency pigeon coo.

I unscrewed the three Torx screws (T25) and removed what seemed to be some sort of thick rubber gasket or weatherstripping that was partially shredded and jammed under what I assume is a baffle(rectangular plastic door covered in foam) that has something to do with the recirc mode button. Part of the shredded gasket was sticking into the blower turbine blades, causing the noise.

Finally I can use max heat and fan and not feel like I'm torturing my poor truck - which is great because it was like 4 degrees last week. So now I'm trying to determine where this rubber strip came from and what purpose it serves so I can determine how much it would cost and how hard it might be to fix.

If anyone has any ideas or comments, shoot.