Audi A7 A/C issues

[WASD]

Hi,
First time poster here. Got a problem with my A7 air con. Lost the cold air, took the car to gas it up, was told the condenser is leaking, installed a new condenser, filled it up with gas, no leaks, holding pressure but still no cold air (clutch on the air con pump is engaged). connected it to vcds and this is what it reads:

08: Auto HVAC (J255) Labels:| 4G0-820-043-2Z.clb
Part No SW: 4G0 820 043 H HW: 4G0 820 043 H
Component: KLIMA 2 ZONEN H10 0064
Serial number: 16041200040457
Coding: 3623000830
Shop #: WSC 02391 785 00200
ASAM Dataset: EV_AirCondiBasisUDS 002040
ROD: EV_AirCondiBasisUDS_002.rod
VCID: 24479F142FB06A645C-8070

3 Faults Found:
0243 - Function Restriction due to Faults in Other Modules
U1113 00 [009] - -
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 96
Mileage: 226430 km
Date: 2019.07.08
Time: 18:27:05

Voltage terminal 30: 13.86 V
Outside air temperature: 19.0 °C
Engine speed: 750 /min

0314 - Function Restricted due to Missing Message(s)
U1111 00 [009] - -
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 96
Mileage: 226430 km
Date: 2019.07.08
Time: 18:27:05

Voltage terminal 30: 13.86 V
Outside air temperature: 19.0 °C
Engine speed: 750 /min

0387 - Function Restriction due to Faults in Other Modules
U1113 00 [009] - -
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 96
Mileage: 226430 km
Date: 2019.07.08
Time: 18:27:05

Voltage terminal 30: 13.86 V
Outside air temperature: 19.0 °C
Engine speed: 750 /min


-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519) Labels:. 4H0-907-063-V1.clb
Part No SW: 4H0 907 063 BN HW: 4H0 907 063 F
Component: BCM1 2.0 H12 0111
Revision: 20012002 Serial number: 00000001462111
Coding: 2600201040349FE08181008380001D0CCF9DC30A2709010100 0004602100
Shop #: WSC 02391 785 00200
VCID: 75E19250DCAAA3EC3B-8020

Subsystem 1 - Part No SW: 4G2 955 119 HW: 4G8 955 119 A Labels: 1KX-955-119.CLB
Component: WWS57X 120309 H35 0080
Serial number: 120317110914
Coding: 0045F7

Subsystem 2 - Part No SW: 8K0 955 559 HW: 8K0 955 559 Labels: 8K0-955-559.CLB
Component: RLS H04 0003
Serial number: 20138552
Coding: 02562B

Subsystem 3 - Part No SW: 4G0 941 531 G HW: 4G0 941 531 G
Component: E1 - LDS H07 0044
Serial number: 03 04 2012 00001429

1 Fault Found:
03020 - Local databus 2
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 2
Fault Frequency: 1
Reset counter: 96
Mileage: 226430 km
Time Indication: 0
Date: 2019.07.08
Time: 18:22:00

No other fault codes at the time of the scan. Any ideas suggestions. There is some green oxidation around a/c pressure sensor/ switch, will try to clean it tomorrow but if that was the problem would it not produce a sensor specific fault code? Any help would be much appreciated.


How i found the fault.. Plugged it back in to VCDS went to HVAC section opened advanced measuring values and started going thru the readings... got to Pressure Switch values and found it reading 33BAR. (cars a/c was re-gassed by a garage 4 days prior, at first thought they fcked up) i knew the max pressure before the compressor switches off/is not to allowed to come on is 32 BAR. took the pressure sensor/switch off to see if it measures the atmospheric pressure correctly (1BAR) and it didn't, still was reading 33BAR so got a new Pressure Sensor/switch and VOILA!!! runs like a charm.. ice cold air again :)

Hope this helps someone at some point.

[Audibot]

Have you tried clearing the faults and seeing if they come back, or the a/c works?

[WASD]

yeap, tried clearing them, came back straight away, a/c still doesn't work. Ordered a new pressure sensor just in case its faulty but doesn't show up as faulty.

[3g_bishi]

Your compressor maybe if it didn’t have freon in it


Sent from my iPhone using Audizine

[WASD]

FIXED.
How i found the fault.. Plugged it back in to VCDS went to HVAC section opened advanced measuring values and started going thru the readings... got to Pressure Switch values and found it reading 33BAR. (cars a/c was re-gassed by a garage 4 days prior, at first thought they fcked up) i knew the max pressure before the compressor switches off/is not to allowed to come on is 32 BAR. took the pressure sensor/switch off to see if it measures the atmospheric pressure correctly (1BAR) and it didn't, still was reading 33BAR so got a new Pressure Sensor/switch and VOILA!!! runs like a charm.. ice cold air again :)

[bahula03]

FIXED.
How i found the fault.. Plugged it back in to VCDS went to HVAC section opened advanced measuring values and started going thru the readings... got to Pressure Switch values and found it reading 33BAR. (cars a/c was re-gassed by a garage 4 days prior, at first thought they fcked up) i knew the max pressure before the compressor switches off/is not to allowed to come on is 32 BAR. took the pressure sensor/switch off to see if it measures the atmospheric pressure correctly (1BAR) and it didn't, still was reading 33BAR so got a new Pressure Sensor/switch and VOILA!!! runs like a charm.. ice cold air again :)

Thanks for posting your solution Seems like my pressure switch is working fine, but I'm curious (if you remember) what the reported values were with the new switch? My AC seems to work fine, but is definitely more on the cool than cold side, though I understand a lot of that comes from the car "deciding" how cold it needs to be based on other sensor readings.

FWIW, on a 65℉ day with ~90% humidity and the car parked, the switch read
- 12.6 bar with the AC on auto at 75℉
- 11.6 bar with the AC off
- A peak of ~21 bar when setting the AC to Lo and max fan speed, which eventually settled down to ~15 bar