It might be the foam from the blend door, not the cabin air filter. Check out this thread by D2Beetle as his was blowing the foam out the vents too.I am afraid to change mine (99). when i started it last week & turned on the air, some pc of what looked like insulation came out of the dash and when i went to pick it up it crumbled.
I just did mine today. Followed the instructions on this link:I have been putting this off because it looks like a bear to get to.lol mine is a 2003, and im a betting it hasnt been done either. Since I want to paint a few dash pieces I may attempt this when I work up the motivation.lol