Hi - I posted on this subject last August but did a poor job of diagnoses before posting, so I've done a fair amount of research since then but haven't found a similar issue so thought I'd try here with more information.

Had this car since '09, second owner. 115K miles. Never had an issue with the AC til now. Started last fall so hasn't been too much of an issue until the weather started warming up recently. When this first happened I ran codes and had both an AUC sensor and fogging sensor fault and replaced both but no change in behavior. Compressor is definitely kicking on so that doesn't appear to be the culprit. Thought the refrigerant might be low so put an AC recharger on the high side port but refrigerant showed overcharged so ended up leaving it until now with the weather getting warm.

Tried again today, still blowing warm. Put the Foxwell on it and showed another Fogging sensor fault but cleared it and it has not come back.

So ran live diagnostics and got the following:
* Compressor Refrigerant Capacity: 93%
* Refrigerant pressure sensor supply: 4.98V
* Refrigerant pressure: 8.0 bar
* Fan Control Wheel: 100%
* Outside Temperature: 100 deg
* Evaporator temperature: 98 deg
* Interior Temperature: 92 deg
* Fogging Sensor if installed: 97.33 Hz
* Fogging Sensor power supply if installed: 4.98V
* Compressor refrigerating capacity: 93%

The AC was working fine last summer until this happened, and I didn't touch anything on the AC system. The only possible correlation I can think of is I replaced the plastic cowl cover last year and disconnected and reconnected the AUC sensor as part of the install. I had the AUC sensor fault after that but I don't know if it was their prior to the cowl work, but I can't recall if the AC stopped working immediately after I disconnected and reconnected the sensor or if this happened later. I did replace the AUC sensor when I discovered the fault and I no longer have the fault, but from what I can see its a stretch to connect the AUC sensor to a non-functioning AC. The fogging sensor can wonk up the AC, but typically it appears to only affect some of the vents and all of my vents are blowing warm.

Any ideas? I'm not an AC expert but everything seems to be functioning as it should and didn't want to start throwing parts at it if I can get a better idea of the where the problem lies.

 

Could be the compressor itself. Ensure switch is getting power and get a manifold so you can see what is happening when you turn on the AC. The service line is the low side so don't know why you're hooking up to the high side only. A manifold would be your right course of action to assist with troubleshooting a a/c system. Did you run tests on the IHKA also to make sure that was not the problem.