Resolved Hello, 2007 A3 8P fixer
- Thread starter ramack
- Start date
Resolved
ramack
Active Member
Thanks, I was in the vehicle when you responded, so I didn't see it until now. What I ended up doing was make a couple of logs from 08-Auto HVAC/Advanced Measuring Values/
I selected groups 1x4, 9x4, and 10x4. Then a separate log for group 11x4. The x4 being the four locations in each respective group. Not sure if there's any value of posting those values here. But for Group 10, Field 0, the G263 sensor I also placed it in a small bag of ice. Watching the real-time data I let the sensor get to 0C. At least that's what I was testing, to see if it was measuring accurately. The temperature did reach 0C. Then I removed the sensor from the ice bag, and let it return to ambient. When it stabilized I pressed the G263 probe between my index finger and thumb to get the probe temp up a bit more to read my skin temperature. It appears to measure correctly.
Based on the response of the G263 to being subjected to 0C thru 33C, it is functioning properly and is likely not the cause of the AC issues. Since I've already ordered one which will arrive sometime tomorrow, I'll install it, but I'm not anticipating that to have a result a working AC.
From reading forums, the next common sensor failure is the G65 high pressure switch. I do not see that as being defective either since it compares well with the dial gauges when connected to the low/high pressure lines.
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VCDS > Applications > Control Module Maps > Address 08 & Meas. Value Blocks & Pre-Label Export (or CSV if you prefer that)
ramack
Active Member
Awesome, thanks. That's a better and easier way to get a holistic system snapshot than my way for sure.
ramack
Active Member
The image below is a side by side comparison of the Sebastian's sample 8P snapshot (LH column) vs my 8P (RH column). No significant difference other than it was super hot today. The temp displayed on the IP was 40C (104F). When I measured the floor temps with my IR thermometer it was 51C (125F).
I did think it was odd that there's a +10C difference between the LH and RH footwell temperatures, with the LH side being lower temperature than the RH. However, When I took this snapshot, the G263 was not seated in the evaporator, but still hanging in the air. The sensor is on the RH of the footwell, but has a closer temperature to the LH footwell temperature. Could the footwell sensors be suspect? But I guess at this point, just about everything has to be, ha.
Looking ahead, when the new G263 sensor arrives and has no effect, thoughts about next steps?
I did think it was odd that there's a +10C difference between the LH and RH footwell temperatures, with the LH side being lower temperature than the RH. However, When I took this snapshot, the G263 was not seated in the evaporator, but still hanging in the air. The sensor is on the RH of the footwell, but has a closer temperature to the LH footwell temperature. Could the footwell sensors be suspect? But I guess at this point, just about everything has to be, ha.
Looking ahead, when the new G263 sensor arrives and has no effect, thoughts about next steps?
ramack
Active Member
Does VCDS have access to the climate control module that I can check to see if there are values set wrong?
Your climate control module is right here:
That's what you've been reading data from.
-Uwe-
ramack
Active Member
I installed the new G263 evaporator temperature sensor. It produced similar output as the "old" sensor as I expected, so I removed the new sensor, and reinstalled the original sensor.
This afternoon I installed a new G65 high pressure sensor, no effect. I'm leaving it installed, not replacing with the original.
So...at this point. I've replaced the common sensors that are prone to failure. At this point, I'm suspecting the compressor or the N280. Possibly the climate control head.
This afternoon I installed a new G65 high pressure sensor, no effect. I'm leaving it installed, not replacing with the original.
So...at this point. I've replaced the common sensors that are prone to failure. At this point, I'm suspecting the compressor or the N280. Possibly the climate control head.
ramack
Active Member
Just for grins
, posting an AutoScan. I cleared all DTCs prior to scanning.
, posting an AutoScan. I cleared all DTCs prior to scanning.
Code:
Sunday,14,July,2024,17:04:17:29520
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 24.5.0.0 (x64)
Data version: 20240429 DS355.0
www.Ross-Tech.com
VIN: WAUNF78P77A104761 License Plate:
Mileage: 286130km-177792mi Repair Order:
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Chassis Type: 8P (1K0)
Scan: 01 02 03 08 09 15 16 17 19 25 42 44 46 47 52 56 62 72
VIN: WAUNF78P77A104761 Mileage: 286130km-177792miles
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: Malfunction 0010
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine Labels:. 06F-907-115-AXX.clb
Part No SW: 8P0 907 115 P HW: 8P0 907 115 B
Component: 2.0l R4/4V TFSI 0010
Revision: 5BH15--- Serial number: AUX7Z0F9FNP08B
Coding: 0103010A1C070160
Shop #: WSC 26110 444 84369
VCID: 3F87BA806E0EEC6E7A-806A
VINID: 9D195E5872201C74410041C6048FC2FEEF
No fault code found.
Readiness: 0000 0000
-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 02E-927-770.clb
Part No SW: 02E 300 043 Q HW: 02E 927 770 AE
Component: GSG DSG 070 1303
Revision: 04507000 Serial number: 00000610120886
Coding: 0000020
Shop #: WSC 06314 000 00000
VCID: 224113F4FDBCA18675-8076
No fault code found.
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels:. 1K0-614-517-MK60AT.clb
Part No SW: 1K0 614 517 AC HW: 1K0 614 517 AC
Component: ESP FRONT MK60-AT 0102
Revision: 00H13001
Coding: 0053890
Shop #: WSC 06314 000 00000
VCID: 68D541DC5B008BD6EB-803C
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8P0-820-043.lbl
Part No SW: 8P0 820 043 AA HW: 8P0 820 043 AA
Component: KlimavollautomatH19 0360
Revision: 395007 Serial number: 8P0820043AA
Shop #: WSC 06314 000 00000
VCID: 6BDF3ED04AF6A0CE86-803E
No fault code found.
-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels:. 8P0-907-279-23-H.lbl
Part No SW: 8P0 907 279 F HW: 8P0 907 279 F
Component: Bordnetz-SG H43 1201
Revision: 00H43000 Serial number: 00000006335145
Coding: 018C4F81C014100000181800180000000028FE175C1100
Shop #: WSC 06314 000 08192
VCID: 4085B97C13F0939603-8014
Subsystem 1 - Part No: 8P1 955 119 E Labels: 1KX-955-119.CLB
Component: Wischer AU350 H01 0130
Coding: 00062736
Shop #: WSC 06314
No fault code found.
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8P0-959-655-94.lbl
Part No SW: 8P0 959 655 A HW: 8P0 959 655 A
Component: Airbag 9.41 H12 3890
Revision: 91H12389 Serial number: 0035W0G032AS
Coding: 0032605
Shop #: WSC 06314 000 00000
VCID: 4085B97C13F0939603-8014
Subsystem 1 - Part No: 8P0 910 339
Component: BF-Gewichtsens. 001 0020
Subsystem 2 - Serial number: 3HQ26
Subsystem 3 - Serial number: 0001.01.000000100000000000ÿ63
Subsystem 4 - Serial number: 000000ÿ6332DRB404295323Bÿ63
Subsystem 5 - Serial number: 95323Bÿ6342DRB4042988B3Tÿ63
Subsystem 6 - Serial number: 988B3Tÿ63528RB401B65F1ATÿ63
Subsystem 7 - Serial number: 65F1ATÿ63628RB401B65F5BZÿ63
Subsystem 8 - Serial number: 65F5BZÿ63729RB401CD5526Rÿ63
Subsystem 9 - Serial number: D5526Rÿ63829RB401CD66BE4ÿ
Subsystem 10 - Serial number: D66BE4ÿ
No fault code found.
-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8P0-953-549-F.lbl
Part No SW: 8P0 953 549 F HW: 8P0 953 549 F
Component: J0527 H36 0070
Coding: 0012142
Shop #: WSC 06314 000 00000
VCID: 4183BC7818FA9A9E0C-8014
Subsystem 1 - Part No: XXXXXXXXXXX
Component: E0221 H07 0090
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8P0-920-xxx-17-MY7.lbl
Part No SW: 8P0 920 981 H HW: 8P0 920 981 H
Component: KOMBIINSTR. VDO H20 0570
Revision: D0H20004 Serial number: 2249F004004615
Coding: 0000268
Shop #: WSC 20213 067 57207
VCID: 3D7BC0886402FE7E68-8068
No fault code found.
-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels:. 1K0-907-530-V2.clb
Part No SW: 1K0 907 530 K HW: 1K0 907 951
Component: J533__Gateway H12 0170
Revision: H12 Serial number: 3300106A02803A
Coding: 3F3F034207002102
Shop #: WSC 06314 000 00000
VCID: 2F67EAC0BE6E1CEEEA-807A
No fault code found.
-------------------------------------------------------------------------------
Address 25: Immobilizer Labels: 1K0-920-xxx-25.clb
Part No SW: 8P0 920 981 H HW: 8P0 920 981 H
Component: KOMBIINSTR. VDO H20 0570
Revision: D0H20004 Serial number: AUX7Z0F9FNP08B
Shop #: WSC 21854 003 1048576
VCID: 3D7BC0886402FE7E68-8068
No fault code found.
-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 8P0-959-801-MIN2.lbl
Part No: 8P0 959 801 H
Component: Tuer-SG 020 0090
Coding: 0001177
Shop #: WSC 06314 000 00000
VCID: 4085B97C13F0939603-8014
No fault code found.
-------------------------------------------------------------------------------
Address 44: Steering Assist Labels: 1Kx-909-144-G2V3.clb
Part No: 1K1 909 144 L
Component: EPS_ZFLS Kl.079 H07 1806
Shop #: WSC 02069 000 90108
VCID: 346DE5AC57483F3697-8060
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8P0-959-433.lbl
Part No: 8P0 959 433 G
Component: KSG H08 0070
Coding: 9B8022A001382D09050FC88F0477
Shop #: WSC 21854 003 1048576
VCID: 4085B97C13F0939603-8014
Subsystem 1 - Part No: 1K0 951 605 C
Component: LIN BACKUP HORN H03 1301
Subsystem 2 - Component: NGS n.mounted
Subsystem 3 - Component: IRUE n.mounted
No fault code found.
-------------------------------------------------------------------------------
Address 47: Sound System Labels: 8Px-035-382.lbl
Part No SW: 8P4 035 382 HW: 8P4 035 382
Component: AB2 SUBWOOFERBOXH04 0180
Revision: 00003 Serial number: 30674696785506
Shop #: WSC 00000 000 00000
VCID: 71E32CB868DA4A1EBC-8024
1 Fault Found:
00421 - Rear Left DSP Midrange Speaker (R105)
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 37
Mileage: 286108 km
Time Indication: 0
Date: 2024.07.14
Time: 10:23:53
Freeze Frame:
Temperature: 30.0°C
-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. Labels: 8P0-959-802-MIN2.lbl
Part No: 8P0 959 802 H
Component: Tuer-SG 020 0090
Coding: 0001177
Shop #: WSC 06314 000 00000
VCID: 4183BC7818FA9A9E0C-8014
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 8P0-035-1xx-56.lbl
Part No SW: 8P0 035 186 F HW: 8P0 035 186 F
Component: concert II US H52 0470
Revision: 04S Serial number: AUZ5Z6F6033755
Coding: 0001005
Shop #: WSC 130822 003 00000
VCID: 356BD8A85C32263EA0-8060
No fault code found.
-------------------------------------------------------------------------------
Address 62: Door, Rear Left Labels: 8P4-959-801.lbl
Part No: 8P4 959 801 D
Component: Tuer-SG 020 0070
Coding: 0001176
Shop #: WSC 06314 000 00000
VCID: 4085B97C13F0939603-8014
1 Fault Found:
00934 - Electric Window Motor; Rear Left (V26)
005 - No or Incorrect Basic Setting / Adaptation
-------------------------------------------------------------------------------
Address 72: Door, Rear Right Labels: 8P4-959-802.lbl
Part No: 8P4 959 802 D
Component: Tuer-SG 020 0070
Coding: 0001176
Shop #: WSC 06314 000 00000
VCID: 4183BC7818FA9A9E0C-8014
No fault code found.
End-------------------------(Elapsed Time: 01:48)--------------------------- Joined
- Feb 13, 2014
- Messages
- 2,980
- Reaction score
- 3,470
- Location
- Magdeburg, Germany
- VCDS Serial number
- HN0-nnnnnn
Let me just get this straight, you replaced the sensor and checked values, then you threw it out again for the original? No test drive etc.?
Your snapshot in #25 is kinda pointless when it comes to testing the N280 or the compressor because it was taken w/o the compressor running. Temperature wise, and this was what I suggested, this looks better but you are still missing the point about the G263. With water getting into the sensor, the values at ambient temp. may very well be OK but the question is how this behaves during an actual running cycle - which is why I would have left the new sensor in and explicitly not gone back to the old one.
I still see no evidence for a faulty clutch, compressor or N280, let alone a faulty control module. Really, where did you get these ideas based on the data you have posted?
If you feel like in depth checking the compressor, N280 etc., you could just run a log during the a drive cycle. This will give you a continuous plot of the components etc.
Your snapshot in #25 is kinda pointless when it comes to testing the N280 or the compressor because it was taken w/o the compressor running. Temperature wise, and this was what I suggested, this looks better but you are still missing the point about the G263. With water getting into the sensor, the values at ambient temp. may very well be OK but the question is how this behaves during an actual running cycle - which is why I would have left the new sensor in and explicitly not gone back to the old one.
I still see no evidence for a faulty clutch, compressor or N280, let alone a faulty control module. Really, where did you get these ideas based on the data you have posted?
If you feel like in depth checking the compressor, N280 etc., you could just run a log during the a drive cycle. This will give you a continuous plot of the components etc.
Last edited:
ramack
Active Member
Sebastian,
I didn't make it clear about what I did with the G263. After installing the new sensor, I did run the AC with it installed. I didn't take it for a test drive, just ran the AC with the car in the driveway. It had no effect compared to the original sensor. This morning I re-installed the new G263 and ran the AC during my morning commute. I didn't have VCDS connected this morning. The ambient air temperature was 21C. The AC set to LOW, fan near high, the lowest vent temperature was 15C.
This vehicle doesn't have a magnetic AC clutch, it's always being driven and the high side pressure is controlled by the N280 solenoid and it's commanded duty. At least that's my understanding of how these systems work.
I suspect the compressor and/or N280 because the live data I've watched in VCDS, along with the low and high pressure readings from the mechanical pressure gauge indicated that the N263 and G65 sensors were operating within their nominal ranges. I've been attempting to diagnose which sensor is failing(if it is) without throwing new sensors on the vehicle as a means of troubleshooting. Now that I have installed two new sensors which did not improve or affect the performance of the AC those are no longer suspects. The remaining suspect components are the compressor, the solenoid or the climate control module. There are more, but these are probably the ones at the top of the list.
Thanks for the URL about data logging, I'll check it out. Yesterday, after I installed the G65 sensor, I did create a log while driving the vehicle back home. I haven't transferred it to my desktop to look at the data yet.
ramack
Active Member
My mistake, I first read the data in your table as the compressor was "off". Looking again, I see that is was running and not off. The corrected snapshot is below. This is with the new G65 and G263 sensors.
I'm not missing the point of the G263 being wet. However, for this case the evaporator is not icing up, then thawing and water pooling in the sensor well. The evaporator is not removing enough heat for ice to form. Evaporator temperatures are not getting anywhere near 0C. The environment in Colorado is arid, any water in the evaporator (if ice did form and melt) would have evaporated during the 3-4years we've owned the car.
It is arid enough that if you don't use ice cubes in the refrigerator, they'll sublime within a couple months, ha.
Here's the updated comparison.
ramack
Active Member
Quick update on this A3 AC issue. Short story is it was the compressor/N280 combo, but I suspect it was a partially functioning, and failing compressor (leaky piston seals) and it just wasn't able to build up pressure. I watching the high/low [mechanical] pressure gauges, when the compressor was switched on/off with the ECON button, the high/low pressure would equalize pretty quickly (3-5 seconds) and from what I understand that typically points toward a stuck open expansion valve. Not 100% sure that was the issue, I ordered an expansion valve and compressor. The expansion valve was inexpensive and relatively easy to access, so I thought I'd try replacing that first.
After replacing the expansion valve, there was no change in performance, so I planned for the compressor R&R over the weekend. It pretty much too all day Saturday, but I was able to get everything done, whew. When I removed the older compressor and spun the pulley, I was pretty confident that it was the issue. As I spun it, I could hear and feel a rubbing noise, not quite metal-metal, but close. I spun the new compressor which was smooth. I flushed the system, installed the new compressor, dryer (that was a pain!), added oil back in the lines, pulled and maintained a vacuum, then recharged the system.
Vent temperatures are now down to ~4-5C!
Thanks for everyone's input and guidance!
After replacing the expansion valve, there was no change in performance, so I planned for the compressor R&R over the weekend. It pretty much too all day Saturday, but I was able to get everything done, whew. When I removed the older compressor and spun the pulley, I was pretty confident that it was the issue. As I spun it, I could hear and feel a rubbing noise, not quite metal-metal, but close. I spun the new compressor which was smooth. I flushed the system, installed the new compressor, dryer (that was a pain!), added oil back in the lines, pulled and maintained a vacuum, then recharged the system.
Vent temperatures are now down to ~4-5C!
Thanks for everyone's input and guidance!