what is brown "stuff" coming out of front center vent? falls apart when touched on 2000 Toyota Sienna

this brown 'stuff' looks a little like insulation of some sort. also when fan is on high, there is a loud humming noise/vibration with ac or heat. noise seems to be up front on passenger side. sounds like coming from under dash. ??

by in Grundy Center, IA on September 01, 2012
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2 answers
ANSWER by , September 01, 2012
MICE HAVE BUILT A NEST IN BLOWER HOUSING NEED TO CLEAN IT OUT. PROB. NEED MECHANIC. THIS HAPPENS A LOT TO MANY AUTOS. SEE IT OFTEN IN THE SHOP. WITH FOREIGN MATTER IN FAN BLOWER WHEEL WILL HUM AND VIBRATE WHILE PUSHING STUFF OUT HEAT/AC DUCTS.
ANSWER by , September 01, 2012
or foam on duct connrction is starting to fall apart