5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 A/C problems
Leading reported evidence
Use a/c
Performed · outcome unconfirmed
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Performed · outcome unconfirmed · Original poster
In cold climates, shortly after you have (unknowingly{??})used the A/C for defog, the cabin will now be quickly super-humidified, moreso than the humidity level that initially lead to the use of defog/demist, due to the aspiration of much or most of the just previously condensed moisture into the incoming airstream.
Leading evidence: 'Use a/c' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace i can support' (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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Performed · outcome unconfirmed · Original poster
During the times it can be used with reasonable efficiently to defog/demist the windshield I have no question that it is a tremendous aid in doing so.
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Suggestion · Original poster
The bottom line is that running the A/C year 'round seems useless to me, and does nothing but waste fuel.
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Suggestion
It occurs to me that one of the reasons you run the AC in the winter time is to keep all the seals etc lubricated.
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Performed · outcome unconfirmed · Original poster
In cold climates, shortly after you have (unknowingly{??})used the A/C for defog, the cabin will now be quickly super-humidified, moreso than the humidity level that initially lead to the use of defog/demist, due to the aspiration of much or most of the just previously condensed moisture into the incoming airstream.
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 · Original poster
But I am very thankfull and extremely greatful that Porsche has the good sense to also ALWAYS use heating, ELEVATED airflow heating, along with the A/C for defogging/demisting the windshield.
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Suggestion · Original poster
In cold climates, shortly after you have (unknowingly{??})used the A/C for defog, the cabin will now be quickly super-humidified, moreso than the humidity level that initially lead to the use of defog/demist, due to the aspiration of much or most of the just previously condensed moisture into the incoming airstream.
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My 01 C4 is in the shop at the moment getting one of the unused console/panel switches wired in series with the refrigrant pressure sensor so I can disable the A/C compressor, TOTALLY during wintertime use.
During the times it can be used with reasonable efficiently to defog/demist the windshield I have no question that it is a tremendous aid in doing so. But I am very thankfull and extremely greatful that Porsche has the good sense to also ALWAYS use heating, ELEVATED airflow heating, along with the A/C for defogging/demisting the windshield.
Lexus (NipponDenso or Denso USA's idiot engineers)relies ONLY on the A/C (cool, dry airflow)for demisting/defogging the windshield, a method which is totally non-functional when the OAT is below 35F, and also of rapidly declining functionality as the OAT declines from about 55F to 35F.
But while the 996 A/C can be VERY effective as an aid in defogging the windshield, the follow-on result, aftermath, is extremely undesireable. In cold climates, shortly after you have (unknowingly{??})used the A/C for defog, the cabin will now be quickly super-humidified, moreso than the humidity level that initially lead to the use of defog/demist, due to the aspiration of much or most of the just previously condensed moisture into the incoming airstream.
The bottom line is that running the A/C year 'round seems useless to me, and does nothing but waste fuel. I can avoid that aspect by always remembering to switch it off, but other than the switch I am adding I know of no way to avoid the super-humidification of the cabin after its initial use in the defog/demist cycle.
It occurs to me that one of the reasons you run the AC in the winter time is to keep all the seals etc lubricated. I think you could have some problems not running it for months at a time.
And I see no harm in clicking the switch on, occassionally, a few minutes before arriving home at night provided I remember to open the sunroof so the accumulated condensation can eveporate out of the car overnight and not be the cause of my windshield fogging over the next morning.
On the other hand my 92 LS400 has never (except teh first winter, 91/92) had the A/C enabled throughout the winter months and continues to be fully functional absent any maintenance whatsoever.
But then my 88 911 can't hold freon from one year to the next regardless. Gave up on trying to fix the leak years ago.
Except in defog/demist mode which is what causes some downstream fogging problems. Much of the moisture just condensed onto the evaporator vanes (during defog/demistmode) is left as a thin coating of mositure, guess where that will go just as soon as you exit defog/demist mode?
(Evaporators have gotten a lot more dense and complex, more total surface area, with the advent of the lower efficiency refrigerants).
Right! Right into the passenger cabin and almost directly to the cold surfaces of the windshield and windows.
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Now that's a regime change I can support.
Man, does that guy want to start a war!
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