michael_winkler66
Audi S7 AC Compressor Failure: Signs and Solutions
Air conditioning blows warm air
Fault stored
A/C System Not Engaging
4 comment(s)
Last serviced at 156522 KM, I appreciate the detailed response. The error code showing is P0532, and yes the blower motor still runs but only produces warm air. No other electrical issues noticed. The HVAC system seems completely dead when trying to activate the cooling function. The refrigerant leak indicator shows no obvious signs of leakage, but I wonder if the pressure switch could be malfunctioning since the compressor wont engage at all. Will try to get a proper diagnostic test done to confirm if its indeed a relay issue like you experienced.
Thanks for providing those additional details. The P0532 code on our Audis specifically points to low pressure in the A/C system, which differs from my initial relay issue diagnosis. After dealing with my S6 problem, I learned these pressure-related shutdowns are actually a built-in protection feature. Even though your refrigerant leak indicator isnt showing obvious signs, my experience suggests you likely have a slow refrigerant leak somewhere in the system. When the pressure drops too low, the A/C compressor wont engage as a safety measure. This explains why your blower works but only produces warm air. A few key points from my experience: The pressure sensor itself could be faulty, giving false low pressure readings, Small refrigerant leaks can be hard to detect without proper equipment, Low refrigerant levels often develop gradually through micro-leaks around seals I recommend getting a professional refrigerant pressure test done, its the most reliable way to pinpoint if youre dealing with a refrigerant leak, faulty pressure sensor, or A/C compressor issue. For my S6, this test proved invaluable in finding the actual problem versus my initial assumptions about the relay.
Thanks for that comprehensive breakdown. Your diagnosis about checking the pressure sensor makes sense given the P0532 code. Since my blower only produces warm air and the compressor wont engage, I will definitely get that professional pressure test done first before replacing any parts. If its just a refrigerant leak causing low pressure readings that would be a much simpler fix than replacing the A/C compressor. Will update once I get the pressure test results back and see what they find with the HVAC system. Really hoping its not the compressor since that would be significantly more expensive than fixing a refrigerant leak or faulty pressure switch.
As someone with some hands-on experience working on Audi vehicles, I encountered a similar issue with my 2012 Audi S6. The A/C system showed similar symptoms, no response and error codes. After taking it to a workshop, they found the AC relay was failing due to an undervoltage condition in the electrical system. The pressure sensor was also giving false readings, which triggered the system shutdown. The total repair came to 240 Euro, including diagnostics and parts replacement. The technician explained that Audi A/C systems have multiple safety features that can shut down the compressor if voltage levels aren't correct. When they fixed the relay switch and checked the entire A/C system, everything started working perfectly again. Before suggesting more specific solutions, could you share: What error code is showing exactly? Have you noticed any other electrical issues? Does the blower motor run at all when you turn on the AC? Have you checked if the refrigerant leak indicator shows any signs of leakage? This information would help determine if your issue matches what I experienced with my S6 or if its something different.