sasilverbullet

Anyone know where this foam is coming from? I cleaned it out today and it was super brittle. Let's see if more shows up.

Any ideas?

Know how to stop if it keeps coming out?

Nein_11

Do a quick search in this forum, and you will find your answer

Nein_11

or read this thread

Marv

Each joint in the plastic ducts has a foam band on it to help seal the joints.

As the foam ages it will shrink and tear free in bits and pieces.

Any work that requires dismantling the ducts simply accelerates the process.

DBJoe996

Here is a helpful hint - search this forum for foam and vents. There literally are hundreds of threads on this same issue. Our cars are approaching 20 years old, and foam, rubber pieces, and all sorts of things are going to deteriorate and wear out.

Os7213

You will probably want to live with it once you found the procedure..

Chris(MA)

Foam goes weird after around 20 years, it either goes brittle and crumbles or shrinks and turns into sticky goo.

porschedog

Welcome to the "What the hell is this stuff?" club. As a 996 ages it begins to slough off bits of itself.

Atrox

alabamatoy

Its actually valuable stuff. Its called "Porsche phlegm". It can be used for various incantations and spells, if you know how. But dont sprinkle it on an air-cooled Porsche, as it will cause the intermediate shaft bearings to fail.

knfeparty

if we could find a way to turn it into electricity, we could solve the world's energy crisis. The foam comes from a never-ending well and will continue to shoot out in large chunks year after year

Tyler H

Most of the foam in the vents comes from the evaporator box heater control flap. It's a stamped metal piece with holes punched into it, covered in foam. The foam delaminates and shows up in the vents.

The defrost, center, floor vent flaps are similar.

808Bill

Not just a Porsche problem either.