My A/C hasn't been working for a while and as the weather is warming up I have decided to do something about it.
Address 08: Auto HVAC Labels: 8P0-820-043.lbl
Part No SW: 8P0 820 043 BH HW: 8P0 820 043 BH
Component: KlimavollautomatH09 0100
Revision: 000710 Serial number: 8P0820043BH
Shop #: WSC 00000 000 00000
VCID: 73E5D39712D0DC86965-8026
1 Fault Found:
01232 - A/C Compressor Regulator Valve (N280)
010 - Open or Short to Plus - Intermittent
Freeze Frame:
Fault Status: 00101010
Fault Priority: 2
Fault Frequency: 254
Reset counter: 73
Mileage: 42926 km
Time Indication: 0
Date: 2013.06.14
Time: 14:09:56
Freeze Frame:
Load: 50.0 %
Current: 0.000 A
From reading online it seems that the N280 valve is goosed and after hooking it up to VCDS today I saw only 6 bar of refrigerant pressure. According to VCDS the range should be from 2.6 to 29 bar. I don't know anything about A/C systems but if it's working I would expect the refrigerant pressure to rise as cooling is increased?
The other interesting thing is the Compressor Shutdown Code 19 (which isn't documented in VCDS). I have found 2 explanations online:
19 Compressor off (-Climatronic control unit -J255 was switched on via the "auxiliary heater" function.)
19 Compressor off (shutoff request from Vehicle Electrical System Control Module via CAN)
Address 08: Auto HVAC (8P0 820 043 BH)
15:45:59 Group 001: General
0.036 A A/C Regulating Valve (N280)
59.5 % A/C Regulating Valve (N280)
22.5 % High Pressure Sensor (G65)
6.0 bar Refrigerant Pressure
15:45:59 Group 002: Compressor Shut-Off Conditions
0.0 Current Shut-Off Condition
19.0 Last Shut-Off Condition
0.0 Last but One Shut-Off Condition
0.0 Last but Two Shut-Off Condition
15:45:59 Group 012
800 /min Engine Speed
0.0 km/h Vehicle Speed
0 Compress. Torque Signal Status
5.0 Nm Compressor Torque
Thursday,15,May,2014,15:52:38:26100
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0
Data version: 20140212
Address 01: Engine (8P0 907 115 AB)
15:52:34 Group 050: Idle Speed Stabilization
820 /min Engine Speed (actual)
840 /min Engine Speed (specified)
A/C-High A/C Readiness
Compr.ON A/C Compressor
The car is going in on Sunday to get the system checked and re-gassed if necessary. If it turns out the N280 valve is the culprit I have found a company in the UK which can supply them. I'm just waiting for confirmation.
Any help in the meantime would be greatly appreciated.
Address 08: Auto HVAC Labels: 8P0-820-043.lbl
Part No SW: 8P0 820 043 BH HW: 8P0 820 043 BH
Component: KlimavollautomatH09 0100
Revision: 000710 Serial number: 8P0820043BH
Shop #: WSC 00000 000 00000
VCID: 73E5D39712D0DC86965-8026
1 Fault Found:
01232 - A/C Compressor Regulator Valve (N280)
010 - Open or Short to Plus - Intermittent
Freeze Frame:
Fault Status: 00101010
Fault Priority: 2
Fault Frequency: 254
Reset counter: 73
Mileage: 42926 km
Time Indication: 0
Date: 2013.06.14
Time: 14:09:56
Freeze Frame:
Load: 50.0 %
Current: 0.000 A
From reading online it seems that the N280 valve is goosed and after hooking it up to VCDS today I saw only 6 bar of refrigerant pressure. According to VCDS the range should be from 2.6 to 29 bar. I don't know anything about A/C systems but if it's working I would expect the refrigerant pressure to rise as cooling is increased?
The other interesting thing is the Compressor Shutdown Code 19 (which isn't documented in VCDS). I have found 2 explanations online:
19 Compressor off (-Climatronic control unit -J255 was switched on via the "auxiliary heater" function.)
19 Compressor off (shutoff request from Vehicle Electrical System Control Module via CAN)
Address 08: Auto HVAC (8P0 820 043 BH)
15:45:59 Group 001: General
0.036 A A/C Regulating Valve (N280)
59.5 % A/C Regulating Valve (N280)
22.5 % High Pressure Sensor (G65)
6.0 bar Refrigerant Pressure
15:45:59 Group 002: Compressor Shut-Off Conditions
0.0 Current Shut-Off Condition
19.0 Last Shut-Off Condition
0.0 Last but One Shut-Off Condition
0.0 Last but Two Shut-Off Condition
15:45:59 Group 012
800 /min Engine Speed
0.0 km/h Vehicle Speed
0 Compress. Torque Signal Status
5.0 Nm Compressor Torque
Thursday,15,May,2014,15:52:38:26100
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0
Data version: 20140212
Address 01: Engine (8P0 907 115 AB)
15:52:34 Group 050: Idle Speed Stabilization
820 /min Engine Speed (actual)
840 /min Engine Speed (specified)
A/C-High A/C Readiness
Compr.ON A/C Compressor
The car is going in on Sunday to get the system checked and re-gassed if necessary. If it turns out the N280 valve is the culprit I have found a company in the UK which can supply them. I'm just waiting for confirmation.
Any help in the meantime would be greatly appreciated.