Audi A6 C5 - no fault code in module 08 Auto HVAC but no cooling

   #1  

Pete4u2

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Hi Ross-tech forum. Although I am using VCDS for a couple of years now this is my first question to you. I am having trouble with the airco of an Audi A6 avant 19tdi from 2002 (C5).
Apparently the airco has been out of order for some years now, I would like to fix it.
First I went to a car centre to remove the oil en gas and let it refill with new one.
The printout of the Waeco Aircon Service mentioned the remaining quantities: 6 ml of oil & 145 grams of coolant. The refill process added 11 ml of oil and 675 grams of coolant.
Unfortunately still no cold air…
I then hooked up my vcds and got a fault in module 08 Auto HVAC: “Fault 01592 – air quality sensor (G238) 37-00 – Faulty” (the airco fan did not run either). Since I have exactly the same sensor in my Audi A8 d3 I switched sensors. After that the error in mod 08 has disappeared and the airco fan is activated. Though, still no cold air ☹ (btw: the airco in my A8 is still doing it after the switch!)
So I saved a recent logfile and took some screenshots of the measuring blocks with the hope some of you specialised in airco can give me a clue where to look.
next thing I would have done is to clean the valves but they are not so easily reachable. So I’d prefer to wait for some input of someone who can read those measuring blocks, tia for your help, Peter



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Code:
Monday,28,May,2018,20:10:33:30559
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
VCDS Version: 18.2.0.3
Data version: 20180212 DS287.0
www.Ross-Tech.com

Dealer/Shop Name: PPS
Workshop Code: 202 01022 081940

VIN: WAUZZZ4B62N009964   License Plate: BRT



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77
 
VIN: WAUZZZ4B62N009964   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 038-906-019-AVF.lbl
   Part No: 038 906 019 GF
   Component: 1,9l R4 EDC G500SG  1434  
   Coding: 00002
   Shop #: WSC 02325  
   VCID: 61C985E1EB3EF54C77-4AE8
   WAUZZZ4B62N009964     AUZ5Z0A5070142

No fault code found.
Readiness: 0 0 X X X 

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4B0-614-517.lbl
   Part No: 4B0 614 517 G
   Component: ABS/ESP front       1328  
   Coding: 06255
   Shop #: WSC 02325  
   VCID: 2541D1F1BF96596C4B-5106

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
   Part No: 4B0 820 043 AB
   Component: A6-Klimavollautomat 0104  
   Coding: 00103
   Shop #: WSC 02325  
   VCID: 5ABBB20DC668269436-257A

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
   Part No: 4B0 959 655 M
   Component: Airbag 8.4E         3002  
   Coding: 0000106
   Shop #: WSC 02325 785 00200
   VCID: 3A7B128D7628C69416-5140

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
   Part No: 4B0 920 900 Q
   Component: KOMBI+WEGFAHRS. M73 D09  
   Coding: 00140
   Shop #: WSC 03141  
   VCID: 2B5527C9D9726F1C9D-4B00
   WAUZZZ4B62N009964     AUZ5Z0A5070142

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
   Part No: 4B0 962 258 K
   Component: Zentralverrieg.,DWA D35  
   Coding: 04939
   Shop #: WSC 00000  
   VCID: 316935A1FB5E05CCA7-4F06

6 Faults Found:
01559 - Drivers Door 
            58-10 - Can't Lock - Intermittent
01562 - Rear right door 
            59-00 - Can't Unlock
01559 - Drivers Door 
            60-10 - Won't Safe - Intermittent
01560 - Passenger Door 
            60-00 - Won't Safe
01562 - Rear right door 
            61-00 - Won't De-Safe
01134 - Alarm Horn (H12) 
            76-10 - Terminal 30 missing - Intermittent

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-173.lbl
   Part No: 4B0 951 173 
   Component: Innenraumueberw.    D03  
   Coding: 00002
   Shop #: WSC 02325  
   VCID: 60CF80E5E034FC4478-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 8Z0-919-283.lbl
   Part No: 8Z0 919 283 
   Component: Parkingsyst. A6 RDW D08  
   Coding: 00116
   Shop #: WSC 02325  
   VCID: 020BAA6D0E784E540E-5140

No fault code found.

End-------------------------(Elapsed Time: 06:32)--------------------------
Code:
Tuesday,29,May,2018,17:52:20:30559
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
VCDS Version: 18.2.0.3
Data version: 20180212 DS287.0
www.Ross-Tech.com

Dealer/Shop Name: PPS
Workshop Code: 202 01022 081940

VIN: WAUZZZ4B62N009964   License Plate: BRT



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77
 
VIN: WAUZZZ4B62N009964   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 038-906-019-AVF.lbl
   Part No: 038 906 019 GF
   Component: 1,9l R4 EDC G500SG  1434  
   Coding: 00002
   Shop #: WSC 02325  
   VCID: 61C985E1EB3EF54C77-4AE8
   WAUZZZ4B62N009964     AUZ5Z0A5070142

No fault code found.
Readiness: 0 0 X X X 

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4B0-614-517.lbl
   Part No: 4B0 614 517 G
   Component: ABS/ESP front       1328  
   Coding: 06255
   Shop #: WSC 02325  
   VCID: 2541D1F1BF96596C4B-5124

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
   Part No: 4B0 820 043 AB
   Component: A6-Klimavollautomat 0104  
   Coding: 00103
   Shop #: WSC 02325  
   VCID: 5ABBB20DC668269436-2580

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
   Part No: 4B0 959 655 M
   Component: Airbag 8.4E         3002  
   Coding: 0000106
   Shop #: WSC 02325 785 00200
   VCID: 3A7B128D7628C69416-5140

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
   Part No: 4B0 920 900 Q
   Component: KOMBI+WEGFAHRS. M73 D09  
   Coding: 00140
   Shop #: WSC 03141  
   VCID: 2B5527C9D9726F1C9D-4B00
   WAUZZZ4B62N009964     AUZ5Z0A5070142

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
   Part No: 4B0 962 258 K
   Component: Zentralverrieg.,DWA D35  
   Coding: 04939
   Shop #: WSC 00000  
   VCID: 316935A1FB5E05CCA7-4F20

4 Faults Found:
01562 - Rear right door 
            59-00 - Can't Unlock
01560 - Passenger Door 
            60-00 - Won't Safe
01562 - Rear right door 
            61-00 - Won't De-Safe
01134 - Alarm Horn (H12) 
            76-10 - Terminal 30 missing - Intermittent

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-173.lbl
   Part No: 4B0 951 173 
   Component: Innenraumueberw.    D03  
   Coding: 00002
   Shop #: WSC 02325  
   VCID: 60CF80E5E034FC4478-4B32

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 8Z0-919-283.lbl
   Part No: 8Z0 919 283 
   Component: Parkingsyst. A6 RDW D08  
   Coding: 00116
   Shop #: WSC 02325  
   VCID: 020BAA6D0E784E540E-5140

No fault code found.

End-------------------------(Elapsed Time: 06:21)--------------------------
 
Last edited by a moderator:
   #2  

Jack@European_Parts

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Is compressor functioning and pumping?

What are pressures of the low and high side during activation?

What is the physical status of N280 valve?

When switching the AC ON does the AC low side line under hood get cold or condensate at all?

typical-a-c-manifold-gauge-set.jpg
 
   #3  

Dana

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Yeah I'm with Jack on the mechanical observations because your compressor shut-off numbers are all zeros. Since the shut off codes are zero, that means the HVAC modules thinks the AC is on, so it isn't shutting it off due to a problem. This may be helpful as well: http://forums.ross-tech.com/showthread.php?633-Tis%92-the-HVAC-Season

Do make sure the cooling fan(s) are working properly before you connect gauges just in case the system is making pressure.
 
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