Macan HVAC Woes: Blower & Temp Sensor Mystery

I had a similar issue with my 2018 Porsche Cayenne last summer. The symptoms were pretty much identical, inconsistent blower speed, temperature control problems, and that annoying warning light. Turned out it was indeed the outdoor temperature sensor connection that was giving me grief. Took it to my local Porsche dealer, and they found that the wiring harness connecting to the sensor had some corrosion and a slightly loose connection. They had to clean the connector pins and secure the connection properly. It wasn't a major repair, but it's something you definitely want to get checked out since these sensors communicate with multiple systems in the car. The fix was pretty straightforward and took less than an hour. Since then, everything's been working perfectly, no more warning lights or climate control issues. I'd recommend getting it checked at an authorized dealer since they'll have the right diagnostic tools to confirm if it's just the sensor connection or something else. Just make sure they thoroughly check the wiring harness too, not just the sensor itself. Better to catch any potential wiring issues early on.

Hey, thanks so much for sharing your experience! That's really helpful and sounds exactly like what I'm dealing with. I'm actually thinking of taking mine to the dealer too now. Just curious, do you remember roughly how much they charged you for the repair? And has everything stayed working properly since then? I've heard these sensors can sometimes act up again after a while.

Hey again! Yes, I can definitely help with those details. I actually just got my Cayenne fixed last week for this exact issue. It cost me 155€ to repair the faulty cable and plug connection to the outdoor temperature sensor. Since the repair, everything's been running like a dream, the climate control is working perfectly, and that annoying warning light is finally gone! I'm really glad I went to the dealer because they did a thorough job checking all the connections. They explained that these sensors often have issues with the wiring rather than the sensor itself, which was exactly what happened in my case. And to answer your question about long-term reliability, my previous sensor issues from last summer haven't come back at all. Once they fix the connection properly, it tends to stay fixed. Just make sure they check all the wiring thoroughly when you take it in. Trust me, it's worth getting it done right the first time! Let me know how it goes when you get yours fixed. I'm betting you've got the same issue I had!

Thanks for all the details! I actually just got back from the Porsche dealer today, and you were spot on! They found the same issue with the wiring harness connection. Mine cost a bit more, around 180€, because they had to replace a small section of corroded wiring too, but honestly, it was worth every penny. The whole thing took about an hour and a half, and wow, what a difference! The climate control is working perfectly now, and that irritating warning light is finally off. The technician showed me the corroded part they replaced, and I can't believe such a small thing was causing so much trouble. Really grateful for your advice about going to the dealer. They definitely knew what they were doing, and it saved me from possibly making things worse by trying a cheaper fix somewhere else. Think I've found my new go-to place for repairs! Thanks again for helping me out. It's such a relief to have this sorted!