Tom in Austin

I occasionally get black foam dust falling out of my floor HVAC ducts onto the floor mats. Porsche put something in there that crumbles and disintegrates over time as seen in this picture from one of Dwayne's write-ups ... what is this stuff and what is it supposed to do? If a person scooped it all out and got rid of it, would it make any difference?

Leon Speed

I am guessing it is sound deadening material or a catch for dust or vapor. Don't think you will notice the difference, then again it is not in there for nothing. Lot of help huh

Barry Chan

Interesting, i will have a look at mine to see, hope its not bad for your health!

Bilal928S4

That is potpourri, it gives that distinct 928 smell.

Chalkboss

Aside from the aroma, if you see this it means that the same material has disintegrated on your HVAC flaps. When this happens your flaps no longer close completely thus allowing air of different temps into the cabin. The fix is to adjust the stepping motor to close this gap. I think Wally had a good write up this. Worked well for me.

MFranke

I vacuumed all that stuff out and haven't noticed any issues.

granprixweiss928

me too. i think its to reduce high frequency fan noise and reduce the draft.

mine is long gone.