Troubleshooting HVAC, How to I check individual components.

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sam08861

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Hi All

I'm getting no cold AC and starting the process of troubleshooting.

As I understand, there's several possibilities and I'm trying to navigate how to troubleshoot. The things to check for this model (info below, along with autoscan log) as I understand are:

1. Blend doors
2. Pressure sensor (G65?)
3. Compressor or attached solenoid.
4. Leaks
5. Finally, charge of refrigerant.

steps performed

Cleared DTCs as I hadn't run VCDS in 4-5 years on this car. Drove the car for a bit.
Found this article on hvac troubleshooting: https://forums.ross-tech.com/index.php?threads/633/
which stated to ensure basic settings are complete.

Checked the wiki for my car, but:

There is currently no text in this page. You can search for this page title in other pages, or search the related logs, but you do not have permission to create this page.

So followed these steps from touareg:

[Select]
[08 - Heating/Air Conditioning]
[Basic Settings - 04]

Group 001
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The basic setting takes approximately 25 seconds.
[Done, Go Back]
[Close Controller, Go Back - 06]


Got fault code. Tried to clear but no luck. Also, car is in ECON only mode, as that button is staying lit up and not responding to presses. This wasn't a problem before the 'basic settings' so I think I may have messed something up. Tried performing this again with the engine not running.

Some questions:

How do I find the high pressure and low pressure measurements? (what steps do I take, as I'm a VCDS beginner)
How do I find the compressor shut off code that's mentioned in the above forum post?

As an aside... I also I have a brake pad warning light that's on even though the pad sensors and fluid level check out. I understand speed sensors can trigger this also. Since that's a different topic, I'll make a new post.


Basic Info:


AUDI Q7 2007 3.6 PREMIUM, Stock, recently did intake valve clean and pcv diaphragm replacement, but AC was a problem well before this.

Autoscan results

Code:
Thursday,24,September,2020,15:03:04:45302
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)
Data version: 20200730 DS317.0
www.Ross-Tech.com


VIN: WA1BY74L27D081739   License Plate:
Mileage: 315390km-195974mi   Repair Order:



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


Chassis Type: 4L (4L0)
Scan: 01 02 03 05 07 08 09 0E 0F 15 16 17 19 1E 28 36 37 3C 42 46
          47 4F 52 55 56 61 62 67 6C 6D 6F 72 76 77

VIN: WA1BY74L27D081739   Mileage: 315390km-195974miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: Malfunction 0010
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: Cannot be reached 1100
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
1E-Media Player 2 -- Status: OK 0000
28-HVAC, Rear -- Status: Malfunction 0010
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
3C-Lane Change -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
61-Battery Regul. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
67-Voice Control -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
6F-Centr. Conv. II -- Status: OK 0000
72-Door, Rear Right -- Status: Malfunction 0010
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (---)       Labels: 03H-906-032-BLV.clb
   Part No SW: 03H 906 032 BG    HW: 03H 906 032 G
   Component: Q7 3.6-FSI-LEV2 G   0770 
   Revision: 5CH05---    Serial number:              
   Coding: 0001175
   Shop #: WSC 31414 790 00001
   VCID: 68DFA42F5BC32DC6BB-803C

No fault code found.
Readiness: 0110 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09E-927-156.lbl
   Part No SW: 4L0 910 156 C    HW: 0AT 927 156
   Component: AG6 0AT 3,6 FSI USA 0010 
   Revision: --H01---    Serial number:        4015857
   Coding: 0000002
   Shop #: WSC 31414 790 00001
   VCID: 2959E12B8049D4CE64-807C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 4L0-910-517-V1.clb
   Part No SW: 4L0 910 517 A    HW: 4L0 614 517 A
   Component: ESP ALLRAD MK25E1   0130 
   Revision: 00H22001   
   Coding: 0033809
   Shop #: WSC 31414 790 00001
   VCID: 285FE42F9B43EDC67B-807C

1 Fault Found:
00457 - Central Electronics Control Module / BCM (J519)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 214
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:40

             Freeze Frame:
                    Count: 0
                    Count: 12289
                    Count: 8238
                    Count: 43264


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852     HW: 4F0 905 852 B
   Component: FBSAUDIC6 ELV   H31 0220 
   Revision: 31050601    Serial number: 10601100664141
   Coding: 0000135
   Shop #: WSC 31414 790 00001
   VCID: 63C5B303A2E54E9E6E-8036

   Subsystem 1 - Part No: 4F0 910 131 L
   Component: FBSAUDIC6 EZS   H45 0080

   Subsystem 2 - Part No: 4F0 910 335
   Component: FBSAUDIC6 KSG   H27 0080

No fault code found.

-------------------------------------------------------------------------------
Address 07: Control Head        Labels: 4L0-910-7xx-07-H.clb
   Part No SW: 4L0 910 732 R    HW: 4E0 035 729 A
   Component: Interfacebox    H43 4610 
   Revision: 00000000    Serial number: 354AK077517305
   Coding: 0032003
   Shop #: WSC 00000 000 08192
   VCID: 387F346F4BE37D46EB-806C

   Subsystem 1 - Part No: 4L0 910 609
   Component: E0380 BedienteilH01 0060

   Subsystem 2 - Serial number: 00000000649964

   Subsystem 3 - Serial number: 0126.01.070000000100010526ÿ

   Subsystem 4 - Serial number: 010526ÿ

2 Faults Found:
01325 - Control Module for Tire Pressure Monitoring (J502)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:58:21

01327 - Control Module for Parking Aid (J446)
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 253
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:46


-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: None
   Part No SW: 4L0 910 043     HW: 4L0 820 043 F
   Component: KLIMABETAETIGUNGH05 0060 
   Revision: 00---012    Serial number: 00000000096749
   Coding: 0786470
   Shop #: WSC 31414 790 00001
   VCID: 61C9B90BB8F95C8E7C-8034

3 Faults Found:
00710 - Defroster Flap Positioning Motor (V107)
            003 - Mechanical Failure
             Freeze Frame:
                    Fault Status: 01100011
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:45

             Freeze Frame:
                    Voltage: 12.10 V
                    Temperature: 28.0°C
                    (no units): 75.0
                    (no units): 110.0
                    Temperature: 31.0°C

02379 - Positioning Motor for Left Side Vent (V299)
            003 - Mechanical Failure
             Freeze Frame:
                    Fault Status: 01100011
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:45

             Freeze Frame:
                    Voltage: 12.10 V
                    Temperature: 28.0°C
                    (no units): 195.0
                    (no units): 142.0
                    Temperature: 31.0°C

01087 - Basic Setting Not Performed
            005 - No or Incorrect Basic Setting / Adaptation
             Freeze Frame:
                    Fault Status: 01100101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 214
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:11:18


-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279 K    HW: 4F0 907 279
   Component: ILM Fahrer      H17 0240 
   Revision: 00000000    Serial number: 4F0907279    
   Coding: 0014123
   Shop #: WSC 31414 790 00001
   VCID: 3169094BA899AC0EAC-8064

   Subsystem 1 - Part No: 4L1 910 113   Labels: 1KX-955-119.CLB
   Component: Wischer AU716   H12 0080 
   Coding: 00064792
   Shop #: WSC 31414 

   Subsystem 2 - Part No: 4E0 910 557 A  Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH13 0090 
   Coding: 00150059
   Shop #: WSC 31414 

No fault code found.

-------------------------------------------------------------------------------
Address 0E: Media Player 1        Labels: 4E0-910-111.lbl
   Part No SW: 4L0 910 110 B    HW: 4L0 035 110
   Component: MP3-Changer     H45 0390 
   Revision: 00045004    Serial number: AUZ5ZBG1200349
   Shop #: WSC 00000 000 00000
   VCID: 1E33C2F7C907237601-804A

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio
Cannot be reached

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4L0-910-655.lbl
   Part No SW: 4L0 910 655 A    HW: 4L0 959 655 B
   Component: 73 AIRBAG AUDI8RH41 0230 
   Revision: 05H41000    Serial number: 0038QD052LKC 
   Coding: 0014131
   Shop #: WSC 31414 790 00001
   VCID: 2B551B238AB5C6DE96-807E

   Subsystem 1 - Part No: 4L0 910 339
   Component: BF-Gewichtsens. H02 0020

   Subsystem 2 - Serial number: 6332QSME1F2E083DV

   Subsystem 3 - Serial number: 6342QSME20064E035

   Subsystem 4 - Serial number: 6352QSME1B103C4BK

   Subsystem 5 - Serial number: 6362QSME1F700B37M

   Subsystem 6 - Serial number: 63734SME1C692405/

   Subsystem 7 - Serial number: 63834SME1C691B6DI

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549     HW: 4F0 953 549 A
   Component: Lenksäulenmodul H07 0230 
   Revision: 00H07000    Serial number: 90026051650340
   Coding: 0002042
   Shop #: WSC 31414 790 00001
   VCID: 66C3AA1751D73BB689-8032

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: Lenkradmodul    H07 0090

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4L0-910-xxx-17.lbl
   Part No SW: 4F0 910 930 C    HW: 4L0 920 980 H
   Component: KOMBIINSTR. M73 H18 0170 
   Revision: 00100000    Serial number: 5HH397027    
   Coding: 2625208
   Shop #: WSC 11090 067 57207
   VCID: 2345F303E2650E9E2E-8076

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 4L0-910-468.clb
   Part No SW: 4L0 910 468     HW: 4L0 907 468 A
   Component: J533__Gateway   H06 0040 
   Revision: 00H06000    Serial number: 0800D0710781F3
   Coding: F5F3FE77747A02
   Shop #: WSC 06436 444 84048
   VCID: 6CD7D83F4F3B01E6DF-8038

1 Fault Found:
02230 - Digital Radio (DAB) (R147)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:58:39


-------------------------------------------------------------------------------
Address 1E: Media Player 2 (R192)       Labels:. 4E0-035-785.lbl
   Part No SW: 4E0 035 785     HW: 4E0 035 785
   Component: SG ext.Player H09 0170 
   Revision: 00000000   
   VCID: 65C1AD1B6CD130AE80-8030

No fault code found.

-------------------------------------------------------------------------------
Address 28: HVAC, Rear        Labels: None
   Part No SW: 4L0 910 158     HW: 4L0 919 158 D
   Component: KLIMABETAETIGUNGH05 0060 
   Revision: 00---009    Serial number: 00000030025481
   Coding: 0000006
   Shop #: WSC 31414 790 00001
   VCID: 68DFA42F5BC32DC6BB-803C

2 Faults Found:
01320 - Control Module for Climatronic (J255)
            013 - Check DTC Memory
             Freeze Frame:
                    Fault Status: 01101101
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:45

             Freeze Frame:
                        ON

02600 - Rear Right Temperature Flap Motor (V314)
            003 - Mechanical Failure
             Freeze Frame:
                    Fault Status: 01100011
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:46

             Freeze Frame:
                    Voltage: 12.20 V
                    Temperature: -100.0°C
                    (no units): 62.0
                    (no units): 175.0
                    Temperature: -100.0°C


-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No SW: 4F0 910 760     HW: 4L0 959 760
   Component: Sitzmemory FS   H01 0100 
   Revision: 00000000    Serial number: 00000000896401
   Coding: 0082954
   Shop #: WSC 31414 790 00001
   VCID: 61C9B90BB8F95C8E7C-8034

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4E0-910-88x-37.lbl
   Part No SW: 4E0 910 888 M    HW: 4E0 919 887 L
   Component: MNS US          H48 1100 
   Revision: 00000000    Serial number: 313AK077516563
   Shop #: WSC 40636 444 999999
   VCID: 387F346F4BE37D46EB-806C

No fault code found.

-------------------------------------------------------------------------------
Address 3C: Lane Change        Labels: None
   Part No SW: 4L0 910 566 B    HW: 4L0 907 566 A
   Component: J0769_SWA_MasterH07 0070 
   Revision: 00H07000    Serial number: 6PZ 009 014-00
   Coding: 0000001
   Shop #: WSC 31414 790 00001
   VCID: 2D51153BB4A1C8EE88-8078

   Subsystem 1 - Part No: 4L0 910 568 B
   Component: J0770_SWA_Slave_H06 0070

   Subsystem 2 - Serial number: 6PZ 009 014-20

   Subsystem 3 - Serial number: 3F18.12.0600H0600000010248ÿ

   Subsystem 4 - Serial number: 010248ÿ

1 Fault Found:
02850 - Control Module 2 for Lane Change Assistance (J770)
            014 - Defective
             Freeze Frame:
                    Fault Status: 01101110
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 214
                    Mileage: 16 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:39


-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 4L0-910-793-42.lbl
   Part No SW: 4L0 910 793 B    HW: 4L0 959 793 B
   Component: TSG FA          H12 0130 
   Revision: 00-00000   
   Coding: 0051915
   Shop #: WSC 31414 790 00001
   VCID: 2F6D0F33BEADBAFEBA-807A

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4L0-910-289.lbl
   Part No SW: 4L0 910 289 D    HW: 4L0 907 289 A
   Component: Komfortgeraet   H05 0020 
   Revision: 0020 ---    Serial number: 01031043990000
   Coding: 7633053
   Shop #: WSC 31414 790 00001
   VCID: 3169094BA899AC0EAC-8064

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H03 1301

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 4L0-910-223-BO.lbl
   Part No SW: 4L0 910 223 G    HW: 4L0 035 223 D
   Component: DSP-High AU716  H03 0150 
   Revision: PROD_01     Serial number: 00000000014339
   Coding: 0000026
   Shop #: WSC 31414 790 00001
   VCID: 285FE42F9B43EDC67B-807C

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 B
   Component: ILM Beifahrer   H10 0080 
   Revision:             Serial number: 00000000072119
   Coding: 0012001
   Shop #: WSC 31414 790 00001
   VCID: 5EB382F78987637641-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 4L0-910-793-52.lbl
   Part No SW: 4L0 910 793 B    HW: 4L0 959 792 B
   Component: TSG BF          H12 0130 
   Revision: 00-00000   
   Coding: 0051915
   Shop #: WSC 31414 790 00001
   VCID: 2F6D0F33BEADBAFEBA-807A

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4F0-910-357.lbl
   Part No SW: 4F0 910 357 F    HW: 4F0 907 357 F
   Component: AFS 1           H01 0020 
   Revision: 00000001    Serial number:              
   Coding: 0000021
   Shop #: WSC 31414 790 00001
   VCID: 2959E12B8049D4CE64-807C

   Subsystem 1 - Part No: 7L6 941 329 A
   Component: AFS-Modul links H06 0002

   Subsystem 2 - Part No: 7L6 941 329 A
   Component: AFS-Modul rechtsH06 0002

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 4E0-910-541.lbl
   Part No SW: 4E0 910 541 T    HW: 4E0 035 541 S
   Component: TUNER EU/US/RDW H42 0630 
   Revision: 00000000    Serial number: 388A%077584937
   Coding: 0000002
   Shop #: WSC 31414 790 00001
   VCID: 3169094BA899AC0EAC-8064

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul.        Labels: 4F0-910-181.lbl
   Part No SW: 4L0 910 181     HW: 4L0 915 181
   Component: J0644 BEM       H12 0530 
   Revision: --------    Serial number: 00000000001060
   Shop #: WSC 31414 790 00001
   VCID: 64C7B01FA7EB49A697-8030

   Subsystem 1 - Part No: 4F0 915 105 D
   Component: von VA0  2701291584      
   Coding: 344630393135313035442056413032373031323931353834
   Shop #: WSC 31414 790 00001

1 Fault Found:
01299 - Diagnostic Interface for Data Bus (J533)
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 253
                    Mileage: 315396 km
                    Time Indication: 0
                    Date: 2020.09.22
                    Time: 14:56:40


-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 4L0-910-795.lbl
   Part No SW: 4L0 910 795 B    HW: 4L0 959 795 B
   Component: TSG HL          H21 0050 
   Coding: 0051722
   Shop #: WSC 31414 790 00001
   VCID: 3169094BA899AC0EAC-8064

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control        Labels: 4E0-910-75x-67.lbl
   Part No SW: 4E0 910 754 Q    HW: 4E0 035 753 A
   Component: SDS 3501 US     H45 0630 
   Revision: 00000000    Serial number: 00000701170050
   Shop #: WSC 12336 024 394758
   VCID: 3467005F578B9926C7-8060

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 4L0-910-441.clb
   Part No SW: 4L0 910 441 A    HW: 4L0 907 441 A
   Component: J772__Rearview      0050 
   Revision: --H12---    Serial number: 525PA8-J6Z421T
   Coding: 1001201
   Shop #: WSC 31414 790 00001
   VCID: 2447F01FE76B09A657-8070

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: 4L0-910-945.clb
   Part No SW: 4L0 910 945     HW: 4L0 827 851 B
   Component: ValeoHeckdeckel H21 0280 
   Revision: --H21001    Serial number: E5030000B    
   Shop #: WSC 98765 666 38354
   VCID: 6CD7D83F4F3B01E6DF-8038

   Subsystem 1 - Part No: 4L0 910 946
   Component: ValeoHeckdeckel H21 0280

   Subsystem 2 - Serial number: E5030100B    

   Subsystem 3 - Serial number: RD29.01.07--H21001001A0027ÿ

   Subsystem 4 - Serial number: 1A0027ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 6F: Centr. Conv. II        Labels:. 4L0-910-290.lbl
   Part No SW: 4L0 910 290 A    HW: 4L0 907 290 A
   Component: ILM HINTEN 2    H05 0060 
   Revision: AAH05061    Serial number: 002349836-----
   Coding: 0003595
   Shop #: WSC 31414 790 00001
   VCID: 2643EA179157FBB649-8072

   Subsystem 1 - Part No: 4L0 910 591
   Component: J_245_EE15_SKB09H10 0180

   Subsystem 2 - Part No: 4L0 910 591
   Component: J_394_EE15_SKB09H10 0180

   Subsystem 3 - Part No: 4L0 910 591
   Component: J_392_EE15_SKB09H10 0180

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 4L0-910-795.lbl
   Part No SW: 4L0 910 795 B    HW: 4L0 959 794 B
   Component: TSG HR          H21 0050 
   Coding: 0051722
   Shop #: WSC 31414 790 00001
   VCID: 3169094BA899AC0EAC-8064

1 Fault Found:
02126 - Central Locking Button; Exterior Door Handle
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 315396 km
                    Time Indication: 0


-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4Fx-910-283.lbl
   Part No SW: 4F0 910 283 F    HW: 4F0 919 283 F
   Component: Parkhilfe 4-Kan H09 0060 
   Revision: 00H09000    Serial number: 06230701514807
   Coding: 0221246
   Shop #: WSC 31414 790 00001
   VCID: 275DE713965DE2BE72-8072

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 4E0-910-336.lbl
   Part No SW: 4F0 910 336 H    HW: 4E0 862 335
   Component: Handyvorb2      H16 1130 
   Revision: 00000000    Serial number: 00000007562588
   Coding: 0010900
   Shop #: WSC 00000 000 00000
   VCID: 285FE42F9B43EDC67B-807C

No fault code found.

End-------------------------(Elapsed Time: 03:18)--------------------------
Log from basic coding in group 08... followed this... group 01, [go], waited a few seconds, [on/off/next], waited 25 secs until activity stopped, [add to log], [done go back], [close controller]

Code:
Thursday,24,September,2020,15:07:09:45302
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.2.0 (x64)
Data version: 20200730 DS317.0
www.Ross-Tech.com


Mileage: 315390km-195974mi   Repair Order:


                Address 08: Auto HVAC  (4L0 910 043 )

15:06:56 Group 001
  N/A   
  N/A   
  N/A   
  N/A
 
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Uwe

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I wonder of @DrPeter has any words of wisdom regarding this old Q7 HVAC.

-Uwe-
 
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DrPeter

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Hello,

I would recommend to have a look at the " Compressor Shut off code" in the Measuring Value Block group [002], field (1), key on, engine running AC set to Auto.
- Let us know what you see there.

The list located on the Ross-Tech forum post Tis’ the HVAC Season is close enough to get you started in the diagnoses.

If you have a value of (2) and you still have a Basic Settings fault code, you may need to fix/correct the two other fault codes for the flap/vent motors.
(2) = Compressor OFF (basic setting not performed or not performed without error)

The other Measuring Value Block group you need to check is the one for refrigerant pressure, let us know what you see in MVB-001, field (4).
- Should be above 3-4 bar static, key on, engine off, depending on the temperature:

G65 Pressure vs. Temperature chart
(When key is on, engine is off, static system pressure)

15C - 59F - 4.0 bar
20C - 68F - 5.0 bar
25C - 77F - 6.0 bar
30C - 86F - 7.0 bar
35C - 95F - 8.0 bar
40C - 104F - 9.0 bar
ref: Tis’ the HVAC Season
Let us know what you see in these Measuring Value Blocks..

Thanks,

drpeter
 
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sam08861

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Thanks drpeter!

I'll check out group 2 field one and mvb-001 field 4.

While I was out and about, I did try some other things earlier today that may or may not be relevant..
  • Ambient Temp today was around 71 degrees F when I tried these things, and I'd driven the car for 1 hour or so running errands and hoping to get the ECON mode to turn off.
  • My advanced measures for the HVAC 08 is greyed out, but in the Engine 01 section, I was able to see the following under advanced measures. From memory, so may be a bit off.
    • A/C Hi Pressure: 4.0 bar.
    • A/C Readiness: Off/Low. (can't recall if it was Off or something else.)
    • Compressor: Off
My laptop battery died just as I was saving that log, lol, but after a recharge, I'll check those things out asap and give a closer read to the Tis' the HVAC Season thread and see if I can get to those flap motors.

Kind regards,

Sam
 
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sam08861

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just checked those blocks....,

Looks like compressor code is "2.0" and the fault code for basic settings persists.

The pressure is 3.4 bar, engine on with an ambient temperature of 74F.
Will have to rerun with engine off to verifying if it’s a different reading

Looking online, it seems the 2 'faulty' motors can be reached by removing the drivers side knee panels and the housing for kessy and some other electronic boxes. However it appears that this will require some 'contortionism' to reach. Not looking forward to that!

Curse you VAG for using cheap potentiometers or the wrong grease in these servos! At least inexpensive replacements are available or the pots can be cleaned.

Hopefully the compressor will spin after that and no leaks. Wish there was a way to 'fool' the system w/o out having to get to those motors.
 
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