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How to attack white dust in the A/C system?

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHHow to attack white dust in the A/C system?

Leading reported evidence

Check cabin air filter, you might be surprised

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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.

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Suggestion

Also, check the cabin air filter, you might be surprised that it's filthy...ask me how I know!

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How to attack white dust in the A/C system?
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Leading evidence: 'Check cabin air filter, you might be surprised' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check cabin air filter, you might be surprised' (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.

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Use foil tape

Suggestion or failed attempt

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Reported fixes
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Unsuccessful attempts
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Discussions
Read evidence and context

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

If I ever do mine (I think my foam has been gone for a long time as I never had the problem of it coming out of the vents) I'm going to use foil tape...

Original post Read captured discussion
How to attack white dust in the A/C system?
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check cabin air filter, you might be surprised

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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

Also, check the cabin air filter, you might be surprised that it's filthy...ask me how I know!

Original post Read captured discussion
How to attack white dust in the A/C system?

Use foil tape

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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

If I ever do mine (I think my foam has been gone for a long time as I never had the problem of it coming out of the vents) I'm going to use foil tape...

Original post Read captured discussion
How to attack white dust in the A/C system?
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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.

6 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: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My son's search for a 996 has focused on a nice example with less than 40K miles, and very clean. When the A/C was operated, white dust particles came out of the vents, so what can be sprayed into the system in order to stabilize what might be aluminum oxide from the evaporator? Where is the A/C drain on a 2003 911? UPDATE: he now adds that there are small chunks of what might be insulation. Is this something that won't go away no matter what?

POST 2Original post

Yup - more like foam from the mixer flaps in the air-handler. It's usually black or gray, but who knows - somebody might have "fixed it" with white foam... If I ever do mine (I think my foam has been gone for a long time as I never had the problem of it coming out of the vents) I'm going to use foil tape...

POST 3Original post

It will go away once it's all deteriorated and blown out. Very common on most all 18 year old vehicles. The drain goes out right side of center about where the center console compartment is.

POST 4 / ORIGINAL POSTEROriginal post

OK, so not a terminal, expensive fix.....just treat it like dashboard lights on BMWs?

POST 5Original post

Regarding foam, you can ignore it, or: https://rennlist.com/forums/996-foru...ent-issue.html ​​​​

POST 6Original post

Also, check the cabin air filter, you might be surprised that it's filthy...ask me how I know!

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