Audi A5 A/C Compressor Dead: Common Fixes & Costs

Had the same issue on my 2011 Audi A4 2.0T. The symptoms matched exactly, no compressor engagement and warm air only. Initially suspected a simple relay switch failure, but diagnostic testing revealed an undervoltage condition in the HVAC system. The root cause was a failing A/C compressor drawing excessive current, which triggered the system protection. The AC relay was actually functioning properly, but the compressor itself was the culprit. This is a common failure point in these engines. The repair required: Complete A/C compressor replacement, New compressor clutch assembly, System evacuation and recharge, Replacement of refrigerant lines This was definitely a serious repair requiring specialized tools and expertise. The symptoms started gradually but eventually led to complete system failure. The repair process took two full days due to the compressor location and the need for proper system testing. Getting the complete job done properly prevents recurring issues and protects other HVAC system components. The problem will not resolve itself and typically gets worse if left unaddressed. Consider having a certified shop perform a proper diagnostic test before replacing individual components like the AC relay or pressure switch, as these are rarely the root cause in this particular failure pattern.

I can relate to that analysis, had similar A/C issues with my Audi A5. After reading this I checked my service records and realized my mechanic initially suspected just a refrigerant leak or faulty pressure switch, but it turned out to be the A/C compressor too. Did you notice any other problems develop after fixing the compressor? And would you mind sharing what the total repair cost was? Curious if it was in the same range as what I paid for mine. The belt tensioner was making noise shortly after my repair, probably due to the new compressor setup, but thats about it.

Good to hear back about your A5. Since my last post, the repair work completely resolved the A/C compressor shut off issues. After fixing the undervoltage problem for 240 Euro, the air conditioning system has been working flawlessly. The new A/C compressor setup hasnt caused any additional problems, no belt tensioner noise or other related issues. The pressure sensor readings have remained stable, and the AC relay functions as intended. Looking back, investing in proper diagnosis and repair was definitely the right choice, even though I was initially worried about costs. The key was addressing the actual electrical problem rather than just replacing parts. The A/C system now maintains consistent cooling performance without any warning lights or error codes.

Thanks for the input. After dealing with my hesitation, I finally took my A5 to a different mechanic. Like many of you mentioned, the issue was bigger than just a pressure switch or refrigerant leak. The diagnostic test revealed a failing A/C compressor with electrical issues. Total repair came to 1850 Euro including: New compressor installation, Complete system evacuation, Fresh refrigerant charge, New pressure sensor Work took about 8 hours. While expensive, the A/C system now works perfectly, cold air flows strong and no more warning lights. No strange noises or issues since the repair three weeks ago. Looking back, should have addressed it sooner instead of worrying about costs. Proper diagnosis really made the difference in fixing it right the first time.