Audi Q2 AC Failure: Compressor Warning Signs & Fixes

I faced a very similar car air conditioning issue with my 2020 Audi Q3. Initially thought it was the compressor too, but after proper diagnosis, the AC unit issues stemmed from a faulty control unit. The symptoms were identical, no response from the HVAC controls, warning lights, and error codes related to the cooling system. After struggling with DIY diagnosis attempts, I took it to a certified workshop. The whole repair process took about 2 days, mainly because they needed to order the specific control unit part. Total cost was 980 Euro, which included diagnostics, the new control unit, and labor. Money well spent considering the alternative of no working air conditioning. Before suggesting specific solutions for your Q2, it would help to know: Current mileage? Any unusual sounds when trying to activate the AC? Did this start suddenly or gradually? Have you had any previous air conditioning repair work done? Might be worth having a professional diagnosis done to confirm the exact issue, as these vehicle HVAC systems can be quite complex.

Thanks for sharing your experience. My car has 22363 KM on the odometer and hasnt had any previous air conditioning repair work done. The issue started quite suddenly during normal driving. There are no unusual sounds, the system just completely fails to respond. No clicking, no fan noise, absolutely nothing when trying the controls. After reading about your control unit problem, I tested the fuses but they all appear fine. The refrigerant leak detection test I had done showed normal pressure levels, which makes me think the auto refrigerant system itself might not be the problem. Maybe it is indeed the control unit like in your case. Will get it properly diagnosed this week since the automotive cooling is completely non-functional at this point.

Having the same control unit failure on my Q3, those symptoms match exactly what happened in my case. The lack of any mechanical sounds or fan response points strongly toward an electrical rather than mechanical issue. The normal pressure readings from your refrigerant leak detection test further support this, as my car also showed proper refrigerant levels despite the complete AC system shutdown. While a refrigerant compressor failure typically produces some noise or partial operation, a dead control unit causes total system silence like youre experiencing. Based on your mileage and the sudden onset, this really mirrors my situation. The cooling system just died without warning around 25000 KM. Good call on checking the fuses, thats exactly what I tried first before discovering it was the control unit. Getting a proper diagnosis is definitely the right move. The car air conditioning repair should be straightforward once they confirm the control module is the culprit. Make sure they check the wiring harness connections too, in some cases these can become loose and cause similar AC unit issues. When you get it checked, ask them to run a full diagnostic on the entire HVAC system. This helped identify some minor issues in my case that could have caused problems later.

Thanks for all the input everyone. Based on the similar symptoms and circumstances described, Im going to schedule a full diagnostic check this week. The fact that my car is showing the same behavior as your Q3 case, complete system silence with normal refrigerant levels, makes me think were dealing with the same control unit failure. The car air conditioning being completely dead with no mechanical sounds, plus the fact it happened suddenly around similar mileage, really points to an electrical rather than mechanical issue. Given that the auto refrigerant pressure tested normal and all fuses check out, Im now fairly confident the vehicle HVAC control module needs replacement. Will make sure they do a complete cooling system diagnostic to catch any other potential issues while theyre at it. Expecting repair costs around 1000 Euro based on your experience, which beats having no working AC. Will update once I get the final diagnosis and repair completed. Thanks again for helping narrow down the likely cause. Having real experience from someone who dealt with identical AC unit issues really helped point me in the right direction.