GTV Blower Motor Dead: AUC Sensor Could Be Culprit

I had a similar issue with a 2000 Alfa Romeo Spider with the climate control system. Having some experience working on Italian cars, I initially thought it might be more complex, but it turned out to be relatively straightforward. The symptoms matched exactly, no blower response and the HVAC sensor system seemed completely dead. The auto recirculation also stopped working entirely. After checking the basics like fuses, the workshop ran a diagnostic test that pointed to a wiring issue near the cabin air sensor connection. The fix involved repairing a corroded wire connection to the air quality sensor module. The wires had degraded over time due to moisture exposure. Total repair cost was 95 Euro, which covered diagnostic time and the wiring repair. What helped speed up the diagnosis was having detailed information about when the problem started. Could you share: Did it stop working suddenly or gradually? Does the system make any noise when you adjust settings? Have you noticed any unusual odors from the vents before it failed? Are there any other electrical issues in your car? This would help determine if you are dealing with the same root cause or if your odor sensor system might have a different issue.

Latest service performed at 126867 KM. The BMW AUC sensor module issue was indeed similar in my case. The technician actually found that both the air quality sensor and the cabin air sensor had deteriorated. The blower and air conditioning sensor circuit started working again after cleaning the connectors and replacing the faulty AUC module. Total repair costs were 320 Euro including parts and labor. The system now responds perfectly to all climate control adjustments. Make sure your workshop checks the wiring harness thoroughly before replacing any components, as corrosion at connection points is a common problem in these models. Considering getting a diagnostic scan before any repairs, as it helped identify the exact issue in my situation.

Thanks for sharing your repair experience. That 320 Euro repair cost actually seems reasonable considering both sensors needed attention. My repair was cheaper since I only needed wiring fixes, but I have seen AUC sensor replacements often run higher, especially when multiple components are involved. The diagnostic scan recommendation is spot-on. When my climate control acted up again last year, I first suspected another sensor fault. But the scan revealed it was actually the blower motor resistor this time, not the AUC sensor system. Would have wasted time and money focusing on the wrong component without proper diagnostics. One tip about the wiring, after my initial repair, I applied dielectric grease to all the cleaned connections. This helps prevent future corrosion issues with the odor sensor and other climate control components. For anyone else reading, this simple preventive step can save expensive repairs down the road. Did you notice any improvement in the auto-recirculation performance after the repair? Mine became much more responsive once the AUC sensor was working properly again.

The diagnostic scan proved invaluable in my case. Completely agree about applying dielectric grease, wish I had known about this preventive measure earlier. Would have saved me from dealing with corroded HVAC sensor connections in the first place. Auto-recirculation is now working perfectly. The air conditioning sensor system responds immediately to external conditions, especially when driving through areas with exhaust fumes. The climate control maintains steady temperature without the constant adjustments needed before. For anyone facing similar issues, my total repair costs of 320 Euro covered: New AUC sensor module, Cabin air sensor replacement, Connector cleaning and treatment, Full diagnostic scan, Labor costs After 5000 KM since the repair, no issues with the sensor fault codes or climate control system. Will definitely get the connections checked during the next service interval to prevent future problems.