10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFoam pieces from A/C vents
Leading reported evidence
Use shop vac
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Used the shop vac to pull the remaining pieces out.
Leading evidence: 'Use shop vac' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace failing foam' (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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Suggestion
It's a royal pain in the rear to dig into those places to replace failing foam.
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 · Original poster
I'm thinking it would be a PITA to pull the dash and replace all the foam.
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
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Suggestion
Best bet is drive the car alot and run the a/c all the time then it will be over in a shorter period of time
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
Since I see no real benefit in using the A/C to cool down the engine coolant, water jacket, I always run the system in Max cool mode (reheat/remix blend door fully closed) and then use the "low" blower speed to control the cabin comfort level.
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
Since I see no real benefit in using the A/C to cool down the engine coolant, water jacket, I always run the system in Max cool mode (reheat/remix blend door fully closed) and then use the "low" blower speed to control the cabin comfort level.
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
Since I see no real benefit in using the A/C to cool down the engine coolant, water jacket, I always run the system in Max cool mode (reheat/remix blend door fully closed) and then use the "low" blower speed to control the cabin comfort level.
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.
10 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: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The current "smelly air post" got me to wondering what I should do about foam chunks flying out of my air vents. The grey colored foam seems to be the stuff used to seal the air ducts to each other. I'm thinking it would be a PITA to pull the dash and replace all the foam.
Has anyone else experienced this?
Mine has been doing the same thing for a year or two. The foam is coming from an vent door inside the system. There is a DIY either here or on Renntech that shows you how to fix it. The dash does not have to come out, and it looks relatively easy.
It's on the list to do, but it's not really bothering me and the HVAC system still works as it should.
Have the problem in the 968 - now 18 years old, but not in the C4. The good news is - unlike the Air Cooled years - these Porsches have such powerful A/C & heaters that a little lost sealing in the vent is not missed. Just need to vacuum more often.
Sadly, as our cars get older and older (particularly in very high heat areas) the foam that helps to seal the various air ducts within the a/c and heating systems starts to break down. It's a royal pain in the rear to dig into those places to replace failing foam. The vacuum solution will at least clear out the existing loose pieces, but in time you will be unable to control your cabin temperature effectively as the ducts will let hot mix with the cold.
Since I see no real benefit in using the A/C to cool down the engine coolant, water jacket, I always run the system in Max cool mode (reheat/remix blend door fully closed) and then use the "low" blower speed to control the cabin comfort level.
In my '95 LS400 I am able to "latch" the coolant valve to the heater core closed, gets me ~28MPG hwy rather than ~25MPG.
The foam is coming from the air intake flapper door right behind the cabin air filter. This is pretty common on older cars that spend most of their time outdoors.
You can easily remove the residual foam sheeting from the flapper door by removing the cabin filter and reaching down to the door and pulling off the remaining foam. Also you can stick a vacuum with a crevice tool on it to suck out any other foam that is in the blower motor cavity right below the door. Lastly, if you want, you can get a new piece of foam from any fabric store and replace the old foam that has disintegrated.
This repair is completely accessible from the outside cowl on the passenger side of the car. Just remove the plastic cover as you would to replace the cabin filter, pull out the filter, and reach in and pull out the old foam.
