9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSomething Blowing out of the vents
Reported or suspected cause
$2 piece of foam breaking down
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
Eventually you may choose to have it "repaired." The problem is a $2 piece of foam breaking down with age.
Leading evidence: '$2 piece of foam breaking down' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is '$2 piece of foam breaking down' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Run full blower' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Easier to tweeze them out if the AC is running full blower.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Very sheer, one or two inch "flakes" blowing out of the vents from time to time. Anybody know where this is coming from and what it could be? Not a big deal, I just vacuum then up . Is it from the cabin filter?
It's a foam that sits deep in the AC housing. Not exactly sure it's purpose, but after many years, it will start to become brittle, and the air current will blow it out of the vents. My indy says it happens on most older 911's, for whatever that's worth.
DS
1999 C2. So how quickly does this need attention (HVAC form seal boot). $1500 sounds , well, crazy. Can I expect the AC to soon stop working? In southwest Florida this becomes more than arbitrary.
$1500 doesn't sound bad considering you would need to remove the whole dash. This is very nroaml with older cars that this foam gasket crumble, it will lose a bit of efficiency but nothing worth $1500.
I have exactly the same issue with my '99 C2 coupe. It has been happening for years. Do not brush the flakes off your shirt if it blows on you. Leaves a black mark. Look into your air vents and you may actually see bigger chunks caught behind the vent flaps. It disintegrates on contact. Easier to tweeze them out if the AC is running full blower. Wear eye protection.
Eventually you may choose to have it "repaired." The problem is a $2 piece of foam breaking down with age. This will actually cost you the above mentioned $1500 or there abouts because it requires removing the entire dash and everything under it to access the valve in a plastic tube that the foam seals. I have seen this operation performed and it is NOT pretty how much is under there. And it never goes back in the same way it did when the car rolled down the assembly line.
Learn to live with it for now. Eventually the valve seal will deteriorate to a point where the valve doesn't completely close. You will then hear the air whistling past the lip of the valve.
Then
decide.
There will be no effect on your AC system or the vent system that will be noticeable.
Be glad you have a '99. Later year 996's have a different underdash mounting system and it is not uncommon to hear that the windshield must first be removed in order to get under the dash assembly.
Great info. I have the same issue on my 2000 C2 Cab. Good to know it'll just be an annoying noise at some point and not anything more. Don't know if it's worth fixing at $1500.
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