AC Blows Hot Air with Fan Error-2008 Rabbit

betterimp · Jul 2, 2020

Hello,
I'm trying to diagnose ac not working.
I have verified there is refrigerant.
With ac turned on pressure on low side is 88psi. High side is 65psi.
Low side pressure is close to ambient temperature.

There are errors in the auto scan referring to the fans, but I have verfied both fans are on and working with engine idling.
I suspect the RCV solonoid is the problem, but I would like to be sure.

I tried to operate the fans by using vcds but was unsuccessful.

Can anyone help with this.

BTW-I turned on AC this morning while driving and had cold air for a short period of time.

Code:

Thursday,02,July,2020,15:41:32:33951
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20200331 DS317.0
www.Ross-Tech.com


VIN: WVWAA71K38W240338   License Plate: 


Chassis Type: 1K (1K0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 52 56 65

VIN: WVWAA71K38W240338   Mileage: 281100km-174667miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: Malfunction 0010
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
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (CBT)       Labels: 06A-906-032-BGP.lbl
   Part No SW: 07K 906 032 BK    HW: 07K 906 032 Q
   Component: 2,5l R5/4V      G   1568  
   Revision: 1NH01---    Serial number: VWX7Z0H03NL95V
   Coding: 0000001
   Shop #: WSC 01279 785 00200
   VCID: 73B3DE1627BD61635E9-8026

3 Faults Found:
006481 - Radiator Fan 2 (V177) 
               P1951 - 002 - Movement Restricted / Jammed - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 131
                    Reset counter: 255
                    Mileage: 251659 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 06:30:15

             Freeze Frame:
                    RPM: 1588 /min
                    Load: 61.2 %
                    Speed: 37.0 km/h
                    Temperature: 86.0°C
                    Temperature: 36.0°C
                    Absolute Pres.: 990.0 mbar
                    Voltage: 14.097 V

006480 - Radiator Fan (V7) 
               P1950 - 002 - Movement Restricted / Jammed - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 16
                    Reset counter: 255
                    Mileage: 252633 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 02:01:00

             Freeze Frame:
                    RPM: 681 /min
                    Load: 18.4 %
                    Speed: 0.0 km/h
                    Temperature: 91.0°C
                    Temperature: 54.0°C
                    Absolute Pres.: 990.0 mbar
                    Voltage: 13.589 V

001152 - Coolant Fan Control Circuit 1 
               P0480 - 004 - Electrical Malfunction - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 0
                    Fault Frequency: 27
                    Reset counter: 255
                    Mileage: 270782 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 11:18:37

             Freeze Frame:
                    RPM: 679 /min
                    Load: 19.2 %
                    Speed: 0.0 km/h
                    Temperature: 92.0°C
                    Temperature: 52.0°C
                    Absolute Pres.: 990.0 mbar
                    Voltage: 13.716 V

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1K0-907-379-MK70.lbl
   Part No: 1K0 907 379 P
   Component: ASR FRONT MK70      0105  
   Coding: 0017025
   Shop #: WSC 01279 785 00200
   VCID: 3FDB42265B75F5036A1-806A

3 Faults Found:
00285 - ABS Wheel Speed Sensor; Front Right (G45) 
            003 - Mechanical Failure - Intermittent
00668 - Supply Voltage Terminal 30 
            002 - Lower Limit Exceeded - Intermittent
00285 - ABS Wheel Speed Sensor; Front Right (G45) 
            012 - Electrical Fault in Circuit

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 1K0-820-047.lbl
   Part No SW: 1K0 820 047 HJ    HW: 1K0 820 047 HJ
   Component: Climatic PQ35   141 1010  
   Revision: 00141028    Serial number: 00000000000000
   Shop #: WSC 00000 000 00000
   VCID: 73B3DE1627BD61635E9-8026

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 3C0-937-049-30-H.lbl
   Part No SW: 3C0 937 049 AJ    HW: 3C0 937 049 AJ
   Component: Bordnetz-SG     H54 2202  
   Revision: 00H54000    Serial number: 00000007947775
   Coding: 108D8F214004150047140000001400000008730B5C000100000000000000
   Shop #: WSC 09460 444 53328
   VCID: 71BFD41E5DA15373AC5-8024

   Subsystem 1 - Part No: 1K1 955 119 E  Labels: 1KX-955-119.CLB
   Component: Wischer 180108 021  0501  
   Coding: 00038805
   Shop #: WSC 09460  

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 1K0-909-605.lbl
   Part No SW: 1K0 909 605 AB    HW: 1K0 909 605 AB
   Component: 6K AIRBAG VW8R  034 8000  
   Revision: 05034000    Serial number: 003B6D0ADA2P  
   Coding: 0013899
   Shop #: WSC 01269 785 00200
   VCID: 6C81C56A7A83BE9B9F3-8038

   Subsystem 1 - Part No: 1K0 959 339 G
   Component: BF-Gewichtsens. 007 0007

   Subsystem 2 - Serial number: 6332MSME3802486BD

   Subsystem 3 - Serial number: 6342MSME327361330

   Subsystem 4 - Serial number: 6352QSME4C77273DW

   Subsystem 5 - Serial number: 6362QSME45334E01C

   Subsystem 6 - Serial number: 63727SME12764F465

   Subsystem 7 - Serial number: 63827SME12765619+

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549 BN    HW: 1K0 953 549 BN
   Component: J0527           051 0100  
   Coding: 0000042
   Shop #: WSC 01279 785 00200
   VCID: 7F5B02261BF535032A1-802A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1K0-920-xxx-17.lbl
   Part No SW: 1K0 920 974 J    HW: 1K0 920 974 J
   Component: KOMBIINSTRUMENT VDD 1216  
   Revision: V0002000    Serial number: VWX7Z0H03NL95V
   Coding: 0007203
   Shop #: WSC 00000 067 57207
   VCID: 3537200E69493F53B0D-8060

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 1K0-907-530-V3.clb
   Part No SW: 1K0 907 530 L    HW: 1K0 907 951 
   Component: J533__Gateway   H15 0180  
   Revision:   H15       Serial number: 1400K081230695
   Coding: E9801F070002020000
   Shop #: WSC 01279 785 00200
   VCID: 3039111A962B1A7BE3B-8064

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 1K0 920 974 J    HW: 1K0 920 974 J
   Component: IMMO            VDD 1216  
   Revision: V0002000    Serial number: VWX7Z0H03NL95V
   Shop #: WSC 00000 000 00000
   VCID: 3537200E69493F53B0D-8060

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MIN3.clb
   Part No SW: 1K0 959 701 M    HW: 1K0 959 701 M
   Component: Tuer-SG         006 1207  
   Coding: 0001077
   Shop #: WSC 01279 785 00200
   VCID: 3829293A7E5BC23BABB-806C

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1Kx-909-144-G2V3.clb
   Part No: 1K1 909 144 M
   Component: EPS_ZFLS Kl.135 H08 1901  
   Shop #: WSC 00028 028 00001
   VCID: 3537200E69493F53B0D-8060

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 1K0-959-433-MAX.clb
   Part No SW: 1K0 959 433 CT    HW: 1K0 959 433 CT
   Component:    KSG PQ35 RDK 052 0221  
   Revision: 00052000    Serial number: 00000000000000
   Coding: 139006885103281B0904058FB0080A04889C00
   Shop #: WSC 00000 785 00200
   VCID: 04518DCA721356DB773-8050

   Subsystem 1 - Component:   Sounder n.mounted     

   Subsystem 2 - Component:       NGS n.mounted     

   Subsystem 3 - Component:      IRUE n.mounted     

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 1K0 959 702 M    HW: 1K0 959 702 M
   Component: Tuer-SG         006 1207  
   Coding: 0001076
   Shop #: WSC 01279 785 00200
   VCID: 392F2C3E4551DB33545-806C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 1K0-035-161.lbl
   Part No SW: 1K0 035 161 C    HW: 1K0 035 161 C
   Component: Radio DE2       015 0019  
   Revision: 00015000    Serial number: VWZ4Z7G6309362
   Coding: 0040402
   Shop #: WSC 01279 785 00200
   VCID: 1F1BE2A6FBB595034A1-804A

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure        Labels: 3C0-959-433-65.lbl
   Part No SW: 1K0 959 433 CT    HW: 1K0 959 433 CT
   Component:    RDK              0450  
   Revision: 00052000    Serial number: 00000000000000
   Coding: 0100101
   Shop #: WSC 131071 1023 2097151
   VCID: 04518DCA721356DB773-8050

No fault code found.

End----------(Elapsed Time: 00:56, VBatt start/end: 12.3V/12.3V)-----------

NZDubNurd · Jul 2, 2020

The fans fail often - the brushes get clogged up and stick in their holders. That usually results in the "Movement Restricted / Jammed" fault

I dismantled mine, cleaned out the crud and freed them up and they're been fine for years. The brushes were only about 1/3 worn.

After that... it probably is the compressor control valve. They also stick and often become intermittent - occasionally giving actual AC, often though, making the AC output feel hot.

TFSI · Jul 2, 2020

Looks like inadequate pressure is the issue, please make sure the basics are right: recover and recharge freon to the required capacity according to elsa/erwin or even there is a data sticker in the hood area that shows recommended freon in grams. Now ensure that the compressor received supply to the N280 valve. If you have voltage present but compressor output is low or no activation, check the compressor pulley, I think this car uses the externally regulated compressor type and mostly the pulley drive sheer off and it spins freely with no engagement due to defect.

betterimp · Jul 3, 2020

AC Hot-Measuging block data for compressor?

I did the same, and the fans are working. The dealer wanted a lot to replace the fans.
This was years ago. I'm wondering why I am getting an error code when the fans are working.

I'm leaning towards the valve. But I'm wondering if I can get data from VCDS that would help me diagnose.
For example, I get expected voltage for the compressor, but actual voltage is blank-when looking at the measuring blocks. This might indicate a lack of signal to the compressor, but I'm not sure?

NZDubNurd said:
The fans fail often - the brushes get clogged up and stick in their holders. That usually results in the "Movement Restricted / Jammed" fault

I dismantled mine, cleaned out the crud and freed them up and they're been fine for years. The brushes were only about 1/3 worn.

After that... it probably is the compressor control valve. They also stick and often become intermittent - occasionally giving actual AC, often though, making the AC output feel hot.

betterimp · Jul 3, 2020

Since I'm getting pressure equal to ambient temperature, doesn't that indicate there is enough refrigerant for the compressor to run?
When the ac switch is turned on, the pressure does seem to change some...low side goes up a little, and high side goes down a little, so they are not equal, but it seems like the compressor isn't doing much of anything.
I don't really understand how the RCV Solonoid works. It is more obvious with "old style" clutch.

Jack@European_Parts · Jul 3, 2020

Did you know the key to the compressor not failing or valve, is running slightly less than factory specs of refrigerant and adding forward fans in front of condenser to reduce and remove heat more effectively while not over taxing the already inefficiently chosen "size" AC compressor by VAG?

Compressor might of already sheared on hub, so it maybe best to inspect it?

Did you try simulating ground completed by duty cycle to compressor valve while observation of pressure changes?

betterimp · Jul 3, 2020

Jack@European_Parts said:
Did you know the key to the compressor not failing or valve, is running slightly less than factory specs of refrigerant and adding forward fans in front of condenser to reduce and remove heat more effectively while not over taxing the already inefficiently chosen "size" AC compressor by VAG?

Compressor might of already sheared on hub, so it maybe best to inspect it?

Did you try simulating ground completed by duty cycle to compressor valve while observation of pressure changes?

I thank you for the videos.
I will check to see if it has sheared.
Not sure what you are saying about the ground. Can you explain for 1st grader to understand.

Jack@European_Parts · Jul 3, 2020

By duty cycle I mean frequency....

I could, however, that is not what this section of forum is for and I'd rather you read the RTFB and SSP for design and function + WD to familiarize circuit.

Please see how to sections too and consider searching videos to self educate on how to test electronics or basic electronic class online, okay?

https://forums.ross-tech.com/showthread.php?633-Tis%92-the-HVAC-Season

Come back with RTFB and WD displayed and let me know what you don't understand?

This class might be helpful found on web no?

https://erwin.vw.com/erwin/showArticleProperties.do?articleId=165189

https://procarmanuals.com/wp-conten...-Conditioning-and-Climate-Control-Systems.pdf

https://www.google.com/url?sa=t&sou...Vaw2JDQ4Jh5qtKd2TXoLv6k4u&cshid=1593804421270

betterimp · Jul 5, 2020

Jack@European_Parts said:
By duty cycle I mean frequency....

I could, however, that is not what this section of forum is for and I'd rather you read the RTFB and SSP for design and function + WD to familiarize circuit.

Please see how to sections too and consider searching videos to self educate on how to test electronics or basic electronic class online, okay?

https://forums.ross-tech.com/showthread.php?633-Tis%92-the-HVAC-Season

Come back with RTFB and WD displayed and let me know what you don't understand?

This class might be helpful found on web no?

https://erwin.vw.com/erwin/showArticleProperties.do?articleId=165189

https://procarmanuals.com/wp-conten...-Conditioning-and-Climate-Control-Systems.pdf

https://www.google.com/url?sa=t&sou...Vaw2JDQ4Jh5qtKd2TXoLv6k4u&cshid=1593804421270

Thank you. This is helpful. I will study.

I would like to become competent at electrical problem solving.

Back to duty cycle. I don't see any change in pressure. I was hoping to find out through VCDS if the signal is being sent to the valve. It might not prove it is the valve, but it would be nice to know the signal voltage is getting to the valve.

Since I did get a short period of cold air the other day, which has not happened again, it leads me to believe the compressor itself is functional, and attached to the shaft.

I appreciate the information. I will study it.

RTFB-Where to find the fine book? Is the Bentley manual what I want?

betterimp · Jul 5, 2020

...previous statement about fans working was incorrect. I saw them running at high speed, but when I turn on the ignition and turn on the ac...neither fan is running, and since I have a fault on the fans, I'm going to remove the fault before considering ac again.

I'm going to revisit output test to see if I can learn more about the fans.

betterimp · Jul 5, 2020

....Ran output test on fans. Both fans start and run during test.
Not sure if this model has a slow speed, but for now, I assume not, since that was not part of the test. I cleared faults for fans. They have not returned, yet.
Downloaded VW Repair Manual for HVAC system, and wiring diagram. Yikes, wiring diagram was a large file, but I have it now.
....not sure what to do, but I think I will try output test HVAC and see what happens.

Jack@European_Parts · Jul 5, 2020

...previous statement about fans working was incorrect. I saw them running at high speed, but when I turn on the ignition and turn on the ac...neither fan is running, and since I have a fault on the fans, I'm going to remove the fault before considering ac again.

I'm going to revisit output test to see if I can learn more about the fans.

Don't speculate verify the mechanical's yet?

....Ran output test on fans. Both fans start and run during test.
Not sure if this model has a slow speed, but for now, I assume not, since that was not part of the test. I cleared faults for fans. They have not returned, yet.
Downloaded VW Repair Manual for HVAC system, and wiring diagram. Yikes, wiring diagram was a large file, but I have it now.
....not sure what to do, but I think I will try output test HVAC and see what happens.

betterimp · Jul 6, 2020

Thanks for the videos.
Pretty sure I observed pulley and shaft spinning together. So, I think that part is mechanically sound.

I will try to test for power to the RCValve.

Jack@European_Parts · Jul 6, 2020

Thanks for the videos.
Pretty sure I observed pulley and shaft spinning together. So, I think that part is mechanically sound.

I will try to test for power to the RCValve.

So you did this by taking off hub and verifying or you used x-ray super hero vision?

If you think you are doing this by looking at pulley on belt and center clutch like a traditional compressor you are way wrong!

betterimp · Jul 7, 2020

Yikes! Quite a lot of sarcasm, but I get your meaning. I understand there is not an external clutch, but I thought I could see pulley and shaft turning together, but apparently that might not be the case. I will have to look at that again!

Jack@European_Parts · Jul 7, 2020

Good idea...........

Did you know it only takes a couple minutes to take hub off to inspect it?

You would appreciate that video and spare part if you dont have to change valve or open system.

AC Blows Hot Air with Fan Error-2008 Rabbit

betterimp

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NZDubNurd

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TFSI

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betterimp

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betterimp

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Jack@European_Parts

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betterimp

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Jack@European_Parts

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betterimp

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betterimp

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betterimp

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Jack@European_Parts

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betterimp

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Jack@European_Parts

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