A7 Climate Control Malfunction Needs Sensor Check

As an A6 (2019) owner, I encountered nearly identical climate control issues. The HVAC sensor failure symptoms matched exactly, no AC function and temperature control malfunction with error codes. The root cause turned out to be a faulty connection between the climate control module and the main temperature sensor. The wiring harness had deteriorated and created intermittent connectivity problems. This is a known weak point in this generation of vehicles. The repair required: Complete diagnostic scan of the climate control system, Removal of the dashboard trim, Replacement of the main HVAC sensor wiring harness, Recalibration of the climate control module This was a moderate repair requiring specialized diagnostic equipment. While not a critical safety issue, it needed proper attention to prevent potential damage to the AC compressor from improper signals. The symptoms you describe strongly suggest a sensor or wiring issue rather than a mechanical AC problem. Given the similar build design of the A6 and A7, I recommend having a certified shop perform a full diagnostic scan focusing on the HVAC sensor network and wiring connections.

Thanks for sharing your A6 experience. The symptoms definitely match what I am seeing with my A7. I had been concerned it might be something major with the AC system, but your explanation about the HVAC sensor and wiring issues makes a lot of sense. How much did the repair end up costing you? Have you had any temperature control or sensor issues since getting it fixed? I want to make sure I budget appropriately and find a shop that will do the job right the first time.

After seeing a certified mechanic, the temperature control problems in my A6 were completely resolved. The faulty interior temperature sensor was causing the HVAC system malfunction, but it turned out to be a simpler fix than initially expected. The issue was traced to a damaged cable connection, which was repaired for 95 Euro. Since the sensor replacement and connection repair, the climate control has worked flawlessly. The temperature readings are accurate, and the AC functions normally. The technician mentioned these sensor issues are relatively common in our model range, but once properly diagnosed and fixed, they rarely recur. The key was finding a shop with the right diagnostic equipment to properly identify the temperature sensor problem. The total repair time was under two hours, making it a much more straightforward fix than a full AC system repair would have been.

Just had my A7 fixed last week after dealing with those frustrating climate control problems. Found a certified shop that really knew their stuff, they diagnosed the HVAC sensor issue right away, just like you described. The mechanic showed me the damaged wiring harness and explained how the temperature sensor was getting faulty readings. The repair came to 120 Euro total, including parts and labor. They replaced the sensor and rewired the connections in about 2.5 hours. Really glad I went ahead with the repair. The climate control system is working perfectly now, no more error codes and the AC blows ice cold again. Such a relief knowing it wasnt a major AC system problem. Having a competent shop made all the difference compared to my previous repair attempts. Next time I need service, I will definitely return to this shop. Their diagnostic approach and expertise with sensor issues saved me from potentially expensive repairs down the line.