Audi RS6 HVAC Control Failure: Critical Climate Fix Guide

Had the exact same symptoms on my Audi S6 (2011). With some experience working on various car issues, I can share what worked in my case. The main problem turned out to be a faulty connection between the climate control unit and the temperature sensor. The control panel was getting incorrect readings, causing the whole system to malfunction. The blower motor would barely run because the electronic control unit wasnt receiving proper signals. Took it to a workshop where they diagnosed multiple electronic faults through their diagnostic system. The fix involved resoldering a loose connection and replacing a damaged plug in the wiring. Total repair cost was 95 Euro and it resolved all the climate control issues completely. Before jumping to conclusions about the wiring harness, we should check a few things about your RS6: Does the temperature display show any readings at all? Are there any other electrical issues in the car? When did these symptoms first appear, gradually or suddenly? Have you noticed any unusual sounds from the blower motor? This information would help determine if youre dealing with the same root cause or if its something else in the system.

The HVAC problems started right after my last service at 30775 KM. A thorough check revealed the temperature sensor readings are completely unusual. The blower motor makes a slight buzzing noise before it stops working. The display shows inconsistent readings, sometimes flashing before going dark. Regarding the additional questions: Temperature display shows unusual numbers, No other electrical issues present, Problems appeared suddenly last week, Blower motor makes buzzing sound initially The wiring harness looks intact from visual inspection, but electronic faults are often tricky to diagnose without proper testing equipment.

Based on those new symptoms, especially the unusual temperature readings and buzzing noise, Im now even more convinced your issue mirrors what I experienced. The timing after service is particularly telling, as electrical connectors can sometimes get disturbed during routine maintenance. The buzzing sound from the blower motor is a classic sign of poor power supply, likely due to compromised electrical connectors. In my case, this exact symptom appeared just before complete failure. When my air conditioning system stopped working, the root cause was a damaged connector plug between the temperature sensor and the control module. The unusual readings youre getting are nearly identical to what I saw, the system cant properly regulate because its receiving incorrect temperature data. A quick test you can try: check if the temperature readings change when you adjust the climate controls. If they dont respond logically, its likely the same sensor connection issue I had. The repair should be straightforward. In my case, they: 1. Replaced the faulty temperature sensor 2. Repaired the damaged connector 3. Verified proper power supply to all components Total repair time was about 2 hours and cost 95 Euro. Since your symptoms are so similar, you might want to have these specific components checked first before exploring more complex issues with the wiring harness.

Thanks for the detailed information. The timing following service and the matching symptoms you described definitely point toward similar electronic faults. Unusual temperature readings plus that buzzing noise from the blower motor make a lot of sense now. I checked my service records and had the car scanned again. The temperature sensor shows inconsistent values ranging from -40 to +80 while the climate control panel keeps resetting. The blower motor buzz has gotten more noticeable this week. Called my regular workshop and scheduled an appointment for tomorrow. Based on your repair experience, I asked them to specifically check: Temperature sensor connections, Power supply to the blower motor, Climate control module wiring The 95 Euro repair cost seems reasonable if it fixes everything. Will update once they diagnose and repair the issue. Hoping its just damaged connectors like in your case rather than a full wiring harness replacement. Really appreciate the detailed comparison and troubleshooting steps. Helped narrow down where to focus the diagnostic efforts.