I'm getting this stuff blowing out of my AC vents. It usually gets stuck behind the vanes and has to be picked out. Anyone see this before? Where's it coming from? BTW how do you guys manage to post such big pictures?

 

There is a thin piece of foam that is attached to the evaporator with clips. Its there to kinda trap/ dissipate water droplets to help keep them from flying through or out of the ac vents.

Replace your evap and don't put the foam back on.

Edit: here's a picture for future people that find this in a search:

 

I would put new foam on, and kill the mouse that is shredding the old foam

 

Mine used to do that, but it must have finally blown all of it out because it doesn't do it anymore. I don't notice any water droplets or anything coming from my vents, so I wouldn't worry about it.

 

All of the foam finally stopped coming out of my vents about a month ago. No mouse as mentioned above just old. You can touch it and it just turn to dust.