Aircon Not Cooling

[WiteWulf]

Afternoon all, I'd like some advice re. getting my aircon working if possible, please.

I have a 2014 A6 C7 Avant Ultra with 4 zone climate feature. Bought it late last year when it was cold and the heater works perfectly (although, thinking back, I did notice that the windscreen was hard to defog). Now the UK temperatures have started heading upwards I find that the A/C doesn't cool.

It's only ~20degC out there at the moment, but dialling the AC down to 16degC gets the fans spinning like mad, but pushing air at ambient temperature.
I've checked, and it's the same at all vents, not just the drivers.
After reading this thread (https://www.audiownersclub.com/forums/topic/15659-no-air-con/) I fitted a Mahle replacement pressure sensor, hoping it would be a quick and cheap fix, but it's made no difference https://audiowners.b-cdn.net/uploads/emoticons/sad.gif
A VCDS scan show no errors with the HVAC systems. See the attached screengrab for figures from when the engine had been running (stationary) for about 30mins with the AC dialled down to 16degC. The compressor is running, refrigerant is at ~6bar and the vents are expecting -13degC but getting +31degC. Refrigerant was at ~3bar with the system not running.


Any bright ideas, people?

39647

[Crasher]

The pressure is low but the symptoms suggest the N280 valve in the compressor is faulty. The system would need to be degassed to change the compressor so when being done, the compressor function can be checked first.

[WiteWulf]

Thanks Crasher, I got a very similar diagnosis over on the audiownersclub.com forum

This vehicle had it's engine swapped out last year, so I'm hoping it's a simple matter of the valve not having it's multiplug reconnected during that work. I'll see if I can figure out where it is. If not, I'll have to get it booked in to somewhere with an HVAC specialist, I guess.

Thanks again for the help.