2005.5 Audi A4 B7
185k miles - 6-speed
Can not figure out this Aircon problem for the life of me, Any help or ideas greatly appreciated

Late last summer my AC randomly stopped working after I fixed it by replacing the pressure sensor (G65) and giving it a new charge. Was cold as ice. Threw the issue under the rug as it was about fall time. Fast forward to now, hours of research and part replacing. No A/C.

So let me start with what I HAVE replaced:

Hi-Pressure sensor G65 (couple years ago)
All 3 relays under the ECU (couple years ago)
Entire fan assembly (last month)
Fan control module (last month)
Climate Control unit (last month)

I had replaced the fans because the A/C fan wasn't turning on, thought that was my culprit and that would be it. replaced the FCM just in case. Tried running 12v to my old fan, no go. Replaced the entire assembly. Now both fans turn on.

So then, stumped... I decided to purchase VCDS. To find out what was causing no AC

It seems my compressor is engaging. My fans are engaging. I have 5.0 BAR pressure... so why still no air??

Here are some logs. If anything else needed just let me know

In regards to the G113 code. Could that stop A/C airflow? As my research tells me, its the flap right up against the box where your cabin air filter is. To check, I removed the filter and the flap never opened when messing with the aircon, or running output tests. Also to note, when I turn ECON ON, no air leaves the vents, but I can hear air flowing. Is this just an issue for recirculation air (ECON) or is this also why I'm not getting A/C. Another note, I also don't get heat in the winter.

Here are some measuring blocks showing my compressor is engaging, and a signal from G65

I'm really stumped here, and any insight would help a ton. It's been crazy hot here on the east coast and I can only do without air for so long. If you have any questions or need me to test something please feel free to comment. Thanks


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Those air flap motors can quite often strip their gears or slip out of alignment. Some folks have found opening them up and reassembling with a little lubricant helps. I just replaced the one that wasn't working when I had problems in that area. They should also be relatively easy to find from any car wrecking yard.

 

I'll throw this out. With BMWs I've owned the heater valves were know to remain open. That allowed the AC to operate and full heat to operate. Not saying this is what is happening here, but it does on bimmers.

 

Make sure the pressure sensor was OEM. A cheaper non-OEM part can malfunction in the heat.