Porsche 991 AC Failure: DIY Fix or Pro Repair Needed?

I had a similar issue with my 2013 Porsche Cayman S last summer. The AC symptoms were exactly like yours, mostly warm air and minimal cooling. Took it to my trusted Porsche specialist, and they diagnosed it as a faulty air quality sensor with damaged wiring. The line/cable from the sensor was defective, causing incorrect readings and messing with the AC system's operation. It wasn't a major mechanical issue, but it did require specialized diagnostic equipment to pinpoint the problem. The repair took about half a day since they had to access some components behind the dashboard. In your case, given the similar symptoms and the fact that it's a 991, I'd strongly recommend going to a certified Porsche specialist. General mechanics might miss the subtle electrical issues specific to these cars. The actual fix isn't complicated for someone who knows what they're doing, but proper diagnosis is key. Where are you located? I might be able to recommend some reputable shops if you're in my area.

Thanks for sharing your experience! That's really helpful, especially since our issues sound so similar. Quick follow-up, do you remember roughly how much you ended up paying for the whole thing? Also, has the AC been working fine since the repair, or have you noticed any other quirks?

Hey again! Glad to help clear things up with your AC issue. Yes, I can definitely tell you that since getting the repair done on my Cayman S, the AC has been working perfectly, no more warm air surprises! The whole thing cost me 95€ to fix that faulty line/cable from the air quality sensor. It was actually a pretty straightforward fix once they identified the problem with their diagnostic tools. I've put quite a few miles on the car since then (it's been about a year now), and I haven't had a single AC-related issue pop up. The air quality sensor is working exactly as it should, and the cooling is consistently strong. Money well spent, if you ask me! If you're experiencing the same symptoms, I'd definitely push you to get it checked out sooner rather than later. These electrical gremlins can be annoying, but they're usually not too complicated or expensive to fix when you catch them early. Just make sure you go to someone who really knows their Porsches, that's key! Let me know if you need any other details about my repair experience. Happy to share more info!

Thanks so much for all the details! I actually went ahead and took your advice about seeing a Porsche specialist. Found a really good one through a local Porsche owners' group. Turns out, you were spot on, it was indeed the air quality sensor causing the problem. Got it fixed yesterday, and they charged me around 110 € for the whole thing, including diagnostic and labor. A bit more than what you paid, but still reasonable considering today's prices. The best part? My AC is finally blowing ice-cold air again! Such a relief, especially with summer coming up. The mechanic was great too, super thorough and took the time to explain everything. Way better experience than my last mechanic who just kept giving me the runaround. Really appreciate everyone's help on this. It's nice to know there are other Porsche owners out there willing to share their experiences. Case closed on this AC drama!