A/C window fogging and defoster

[particlewave]

While redirecting as much airflow as possible through the vents and footwell may work, it's only a band-aid.

As kiyakubuke said, the problem is that the flaps that divert airflow are missing foam and letting air through where it's not supposed to be.
The real solution is to pull every last flap and replace the foam with something that won't deteriorate. Not an easy job

[kiyakubuke]

Originally Posted by particlewave

While redirecting as much airflow as possible through the vents and footwell may work, it's only a band-aid.

As kiyakubuke said, the problem is that the flaps that divert airflow are missing foam and letting air through where it's not supposed to be.
The real solution is to pull every last flap and replace the foam with something that won't deteriorate. Not an easy job

just found this post. going to check this weekend.
http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html

[Meir]

this is a common problem in areas with high heat and humidity.
i have the exact same issue with my current (and 3rd) porsche.
the first one i fixed, because i had a leaking evaporator, so i had to get there anyway.
on the second i didn't care as it was my second car.
my current porsche is my daily driver, and this thing is really annoying me.
maybe a winter project all over again
http://986forum.com/forums/performance-technical-chat/36713-ac-question.html

[Alfieg23]

Same problem here. Solution is to either use your wipers periodically or redirect the air, fan on hi and the temp. to LO, from the defroster vents.

Regarding the foam flakes, I also have that issue. I have minimized it by (1) closing all the vents (2) turning the air on high (3) opening each vent individually with the shop vac nozzle up against the vent (4) closing that vent and repeating with each vent. It seems to blow the majority of the foam out and into your vac. You will need to repeat the process down the road if and when you start seeing foam behind one of the vents. I hope this helps.

[kiyakubuke]

so the problem with my vents was that the diverter flap next to the heater core had most of the foam missing. took it out, cleaned it and put new foam on it. everything is fine now.

https://flic.kr/s/aHskFqRr5e