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Discussion Starter · #1 ·
Back in August my AC quit working, by that I mean it doesn't blow cold air. It's an 02 GLX 2.8L w/ climatronic. Heat works fine. i had my dad try to charge it and he said it wa already fully charged, he thought a flap was malfunctioning maybe. Shortly after i bought a Vag-Com and scanned it, this was the first scan

Address 08: Auto HVAC
Part No: 3B1 907 044 J
Component: CLIMATRONIC B5GP 0003
Coding: 17200
Shop #: WSC 00028

3 Faults Found:
01271 - Positioning Motor for Temperature Flap (V68)
37-10 - Faulty - Intermittent
01274 - Air Flow Flap Positioning Motor (V71)
37-00 - Faulty
01341 - Control Module in Instrument Panel On Comfort CAN (J285)
27-10 - Implausible Signal - Intermittent

I then later on tried to cycle the AC from high to low temp, that didn't appear to work. Cleared codes and rescanned and then it was this:

01274 - Air Flow Flap Positioning Motor (V71)
37-00 - Faulty

I rescanned last night and nothing came up on HVAC, I ran the basic settings and did some other tests in the HVAC, didn't really know what the numbers meant. I've taken the glove box out and watched the various components moving when the Vag-Com was testing it. I'm still not getting cold air, and nothing shows up on the Vag-Com results now. Anyone have any ideas, suggestions, anything? I have the bentley, it looks like getting to the V71 motor is a PITA...:nervous:
 

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On the Passat, air always passes through the A/C evaporator no matter what temperature or airflow settings you're using. This helps you defrost or dehumidify even when using heat settings. The Climatronic control head manages the A/C compressor settings as needed. The only possible way that an air flow flap or flap control motor could be at fault here is if the temperature control flap's range was limited to partial-heat and full-heat (thus re-heating the cooled air), and I would really think you would have noticed that, and there's almost no way that could happen without setting a DTC every time it tried to move there.

Take a look at this thread I participated in: A/C glitch once in a while

It describes compressor shut-off reason codes and how to get them. There's a way to do it just by pressing a series of buttons on the Climatronic control head, but you've also got VAG-COM handy and you can get the same data that way. It'll be the first field in MVB 001 on the Auto HVAC controller, which you've already shown here you know how to connect to. With your car running and the Climatronic control head set to cool down the car, the shut-off code value should be 0, indicating the compressor is running. If it is 0, that means the compressor is running and you're still not getting cold air, and if you've already attempted a recharge and that didn't work, you will need a professional A/C service shop to look at the car. Your dealer may or may not be the best place to get this done. If the code is other than zero, then you deal with it accordingly. If you're not sure what to make of the code, post here and we'll try to help.

It's possible that you have flap motor problems too, but that would be separate. V71 being defective will not affect air temperature. In the Passat, the V71 motor can move two different flaps depending on its position. It serves the dual role of partially choking the outside vent flow based on vehicle speed (keeps incoming air flow constant) and switching to inside recirculated air. V71 being stopped/stuck in the very worst-case position (recirc flap down, vent control flap most or all the way up) may severely choke down the total airflow you get from the blower motor, but the air you do get would still be cold if the A/C was working. V68 being defective would affect temperature, but you have no current DTCs and you state that you can turn heat on and off. The DTC you have about the control head not communicating with the instrument cluster is interesting, but it's not happening as of when you did your first fault scan (showing Intermittent) and it hasn't come back. It seems to be very common for the Climatronic control head to see faulty flap motors, but they can still be quite functional. I've got one right now, my central air flap motor, that mechanically works fine but the internal potentiometer gives bogus readings at one extreme of its movement.

I've recently spent a lot of time troubleshooting flap motor issues on my own car, so if you want, I could take a look at your Climatronic control head's current state. Hopefully you purchased a true Ross-Tech diagnostic cable and have one of the newer versions of VAG-COM that work with it. If so, take a pre-label file from your Auto HVAC controller and email it to me. Do this at a moment when your engine is running and you're certain your A/C should be blowing cold air. Open VAG-COM and go to Applications, then Controller Channels Map. Use address 08, measuring value blocks, pre-label file. This is just a quick way to save a copy of every measuring value block and field the controller supports. Send me the resulting file. If you did not purchase a true Ross-Tech diagnostic cable, you will be stuck with an older version of the software and you will not have this capability.
 

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Discussion Starter · #3 ·
:bowdown: :bowdown: :bowdown: wow, informative to say the least... i recorded the measurements from 1 to 70 whatever mine goes to, haven't had a chance to hook up the vag-com again yet, i have to use my dang desktop still... so your opinion is that it is likely a bad sensor not a flap? i can post whatever measurements are relativent, just don't want to post them all and waste everyones time, thanks again
 

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Discussion Starter · #4 ·
Ok, I'm going to bump this up... Spring will be here soon, and I'm thinking of selling the car for a different passat. Anyone have any ideas? I did a rescan end of january, and this is what shows up in the results for the HVAC:

Address 08: Auto HVAC
Part No: 3B1 907 044 J
Component: CLIMATRONIC B5GP 0003
Coding: 17200
Shop #: WSC 00028

2 Faults Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent
01341 - Control Module in Instrument Panel On Comfort CAN (J285)
27-10 - Implausible Signal - Intermittent


Now I have other errors about "signal too low - Intermittent" So i'll post those below, incase there is something thats all tied together... Does the CCM affect the AC at all?

Address 15: Airbags
Part No: 6Q0 909 605 C
Component: 09 AIRBAG VW6 04 0004
Coding: 12345
Shop #: WSC 00028

1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

Address 36: Seat Mem. Drvr
Part No: 3B1 959 760 D
Component: Sitzverstellung 0101
Coding: 0000000
Shop #: WSC 00000

1 Fault Found:
00668 - Supply Voltage Terminal 30
002 - Lower Limit Exceeded - Intermittent

Part No: 1C0959812
Component: 09 Tõrsteuer.HR KLO 0002

5 Faults Found:
01330 - Central Control Module for Central Convenience (J393)
53-10 - Supply Voltage Too Low - Intermittent
01331 - Door Control Module; Driver Side (J386)
53-10 - Supply Voltage Too Low - Intermittent
01332 - Door Control Module; Passenger Side (J387)
53-10 - Supply Voltage Too Low - Intermittent
01333 - Door Control Module; Rear Left (J388)
53-10 - Supply Voltage Too Low - Intermittent
01334 - Door Control Module; Rear Right (J398)
53-10 - Supply Voltage Too Low - Intermittent
 

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All of the errors are flagged as Intermittent (not happening right now), and almost entirely center around low voltage. The one that isn't explictly low voltage could easily be explained by low battery voltage. Presumably your battery was low or dead at some point.

What we would need in order to help further is what I talked about in my reply above. At a minimum, set the Climatronic for max cold (hit the Colder button till you see LO for the temperature) and get the compressor shut-off reason code either from the right MVB in VAG-COM, or from the control panel diagnostic mode.
 

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Discussion Starter · #6 ·
Ok... Ran diagnostics.

Channel 5 10.3C
Channel 6 14.0-15.0C
Channel 64 5.5C

I think I got a 0 displayed for the shut off code value... Which is bad right? I am sending the file to your email for you to look at more in depth... Thank you for the help so far...

Here's the result of the auto-scan after clearing it the first time tonight:

VAG-COM Version: Release 607.3-UD

Tuesday,20,February,2007,17:37:47

Chassis Type: 3B - VW Passat B5
Scan: 01 02 03 08 15 16 17 19 35 36 37 46 47 55 56 57 58 75 76 77


VIN Number: WVWRH63B22P120246
-------------------------------------------------------------------------------
Address 01: Engine
Part No: 3B0 907 551 CG
Component: 2.8L V6/5V G 0001
Coding: 07501
Shop #: WSC 00028
WVWRH63B22P120246 VWZ7Z0A4022233

2 Faults Found:
16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
P0421 - 35-00 - -
16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 35-00 - -
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Part No: 3B0 614 111
Component: ABS/ASR 5.3 FRONT D00
Coding: 00032
Shop #: WSC 00028

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC
Part No: 3B1 907 044 J
Component: CLIMATRONIC B5GP 0003
Coding: 17200
Shop #: WSC 00028

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags
Part No: 6Q0 909 605 C
Component: 09 AIRBAG VW6 04 0004
Coding: 12345
Shop #: WSC 00028

1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 16: Steering wheel
Part No: 1J0 907 487 B
Component: Lenkradelektronik 0002
Coding: 00008
Shop #: WSC 00028

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments
Part No: 3B0 920 926 B
Component: KOMBI+WEGFAHRSP VDO V01
Coding: 07235
Shop #: WSC 00028
WVWRH63B22P120246 VWZ7Z0A4022233

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway
Part No: 6N0 909 901
Component: Gateway K<->CAN 0001
Coding: 00006
Shop #: WSC 00028

1 Fault Found:
01320 - Control Module for Climatronic (J255)
49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr
Part No: 3B1 959 760 D
Component: Sitzverstellung 0101
Coding: 0000000
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.
Part No: 1C0 959 799 C
Component: 09 Komfortgerát HLO 0001
Coding: 00259
Shop #: WSC 00028

Part No: 1C0959801
Component: 09 Tõrsteuer.FS KLO 0002

Part No: 1C0959802A
Component: 09 Tõrsteuer.BF KLO 0002

Part No: 1C0959811
Component: 09 Tõrsteuer.HL KLO 0002

Part No: 1C0959812
Component: 09 Tõrsteuer.HR KLO 0002

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio
Part No: 1J0 035 180 B
Component: Radio DE2 0005
Coding: 04041
Shop #: WSC 00028

No fault code found.

End --------------------------------------------------------------------------------------------------
 

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Discussion Starter · #8 ·
another bump jyoung, if you could take a look at the results for me and give me your input, i'd be grateful
 
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