foam particles coming from all HVAC vents
04-28-2017, 02:05 AM
#16
Rennlist Member
My 99 C2 did this the day I bought it (used) in 2016. You can put the Blower on max speed and close all but one of the center vents. Wiggle the air vents up, down, side to side. Lots of foam comes up. Repeat for all vents. Do the top windshield vents and bottom floor vents. Then take your car to get it hand washed.
08-04-2017, 03:35 PM
#19
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Foam information
I have the same problem on a 03 TT. I have dealt in foam for most of my career so I will offer some information that may clear up what I think is a misunderstanding. The foam on the blend doors is what is know as reticulated polyester foam and it does oxidize causing it to fall apart. By Porsche using this foam, it seems to me it is being used as a filter of sorts, allowing air passage because reticulated foam is used for filters. So, replacing it with a closed cell foam will defeat the openings in the blend panels and change the air mixture. I believe it would be better to replace it with some other filter medium which would allow airflow, but not oxidize as quickly. I am looking into thin electrostatic filter material of metal "foam" or some more durable plastic compound.
08-04-2017, 05:49 PM
#20
Drifting
I have the same problem on a 03 TT. I have dealt in foam for most of my career so I will offer some information that may clear up what I think is a misunderstanding. The foam on the blend doors is what is know as reticulated polyester foam and it does oxidize causing it to fall apart. By Porsche using this foam, it seems to me it is being used as a filter of sorts, allowing air passage because reticulated foam is used for filters. So, replacing it with a closed cell foam will defeat the openings in the blend panels and change the air mixture. I believe it would be better to replace it with some other filter medium which would allow airflow, but not oxidize as quickly. I am looking into thin electrostatic filter material of metal "foam" or some more durable plastic compound.
08-04-2017, 06:05 PM
#21
Scared to Look
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Mine does it too but Im not spending 4 hours taking the car apart to fix it.
It will all blow off eventually or the engine will blow because I didn't address that issue. we shall see which happens first.
It will all blow off eventually or the engine will blow because I didn't address that issue. we shall see which happens first.
08-04-2017, 07:33 PM
#22
"Mine does it too but Im not spending 4 hours taking the car apart to fix it.
It will all blow off eventually or the engine will blow because I didn't address that issue. we shall see which happens first."
This!!! I thought I was lucky on my high mile '02 C2, but last year the occasional piece or two started accumulating much faster. I vacuum the vents out regularly, (although great tip about closing all but one at a time), and it's something I can live with.
It will all blow off eventually or the engine will blow because I didn't address that issue. we shall see which happens first."
This!!! I thought I was lucky on my high mile '02 C2, but last year the occasional piece or two started accumulating much faster. I vacuum the vents out regularly, (although great tip about closing all but one at a time), and it's something I can live with.
08-07-2017, 04:51 PM
#23
Rennlist Member
Subscribed!
08-07-2017, 05:25 PM
#26
Nordschleife Master
This has happened to every German car I've owned after they pass a certain age. I am convinced its not the quality of the foam they use, rather its the adhesive used to attach the foam. After a few hot summers (heat/cold AC cycling) the adhesive breaks down and causes particles of foam to detach. Either that or the adhesive degrades the foam and it deteriorates. I think they all use the same Wurth adhesive and I'm pretty sure they also use it on the headliner on my 944's as that adhesive simply crumbles and brings the lining down with it. Also on the rear shelf of my AMG, which is always exposed to the sun, its detaching from the base and the adhesive underneath is dust. Just my theory.