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Thread: A/C not blowing cold air

  1. #1
    davc's Avatar
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    A/C not blowing cold air

    My A/C hasn't been working for a while and as the weather is warming up I have decided to do something about it.

    Address 08: Auto HVAC Labels: 8P0-820-043.lbl
    Part No SW: 8P0 820 043 BH HW: 8P0 820 043 BH
    Component: KlimavollautomatH09 0100
    Revision: 000710 Serial number: 8P0820043BH
    Shop #: WSC 00000 000 00000
    VCID: 73E5D39712D0DC86965-8026

    1 Fault Found:
    01232 - A/C Compressor Regulator Valve (N280)
    010 - Open or Short to Plus - Intermittent
    Freeze Frame:
    Fault Status: 00101010
    Fault Priority: 2
    Fault Frequency: 254
    Reset counter: 73
    Mileage: 42926 km
    Time Indication: 0
    Date: 2013.06.14
    Time: 14:09:56

    Freeze Frame:
    Load: 50.0 %
    Current: 0.000 A

    From reading online it seems that the N280 valve is goosed and after hooking it up to VCDS today I saw only 6 bar of refrigerant pressure. According to VCDS the range should be from 2.6 to 29 bar. I don't know anything about A/C systems but if it's working I would expect the refrigerant pressure to rise as cooling is increased?

    The other interesting thing is the Compressor Shutdown Code 19 (which isn't documented in VCDS). I have found 2 explanations online:

    19 Compressor off (-Climatronic control unit -J255 was switched on via the "auxiliary heater" function.)
    19 Compressor off (shutoff request from Vehicle Electrical System Control Module via CAN)



    Address 08: Auto HVAC (8P0 820 043 BH)

    15:45:59 Group 001: General
    0.036 A A/C Regulating Valve (N280)
    59.5 % A/C Regulating Valve (N280)
    22.5 % High Pressure Sensor (G65)
    6.0 bar Refrigerant Pressure

    15:45:59 Group 002: Compressor Shut-Off Conditions
    0.0 Current Shut-Off Condition
    19.0 Last Shut-Off Condition
    0.0 Last but One Shut-Off Condition
    0.0 Last but Two Shut-Off Condition

    15:45:59 Group 012
    800 /min Engine Speed
    0.0 km/h Vehicle Speed
    0 Compress. Torque Signal Status
    5.0 Nm Compressor Torque


    Thursday,15,May,2014,15:52:38:26100
    VCDS -- Windows Based VAG/VAS Emulator
    VCDS Version: 12.12.2.0
    Data version: 20140212


    Address 01: Engine (8P0 907 115 AB)

    15:52:34 Group 050: Idle Speed Stabilization
    820 /min Engine Speed (actual)
    840 /min Engine Speed (specified)
    A/C-High A/C Readiness
    Compr.ON A/C Compressor

    The car is going in on Sunday to get the system checked and re-gassed if necessary. If it turns out the N280 valve is the culprit I have found a company in the UK which can supply them. I'm just waiting for confirmation.

    Any help in the meantime would be greatly appreciated.
    MY'09 S3 Sportback |Gloss Black Mirrors |Buckets |Black Optiks |Open Sky |Light & Rain Sensor Pack |CH/LH Lights |RNS-E & No Highs No Lows it must be Bose |

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  3. #2
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    Quote Originally Posted by davc View Post
    My A/C hasn't been working for a while and as the weather is warming up I have decided to do something about it.

    Address 08: Auto HVAC Labels: 8P0-820-043.lbl
    Part No SW: 8P0 820 043 BH HW: 8P0 820 043 BH
    Component: KlimavollautomatH09 0100
    Revision: 000710 Serial number: 8P0820043BH
    Shop #: WSC 00000 000 00000
    VCID: 73E5D39712D0DC86965-8026

    1 Fault Found:
    01232 - A/C Compressor Regulator Valve (N280)
    010 - Open or Short to Plus - Intermittent
    Freeze Frame:
    Fault Status: 00101010
    Fault Priority: 2
    Fault Frequency: 254
    Reset counter: 73
    Mileage: 42926 km
    Time Indication: 0
    Date: 2013.06.14
    Time: 14:09:56

    Freeze Frame:
    Load: 50.0 %
    Current: 0.000 A

    From reading online it seems that the N280 valve is goosed and after hooking it up to VCDS today I saw only 6 bar of refrigerant pressure. According to VCDS the range should be from 2.6 to 29 bar. I don't know anything about A/C systems but if it's working I would expect the refrigerant pressure to rise as cooling is increased?

    The other interesting thing is the Compressor Shutdown Code 19 (which isn't documented in VCDS). I have found 2 explanations online:

    19 Compressor off (-Climatronic control unit -J255 was switched on via the "auxiliary heater" function.)
    19 Compressor off (shutoff request from Vehicle Electrical System Control Module via CAN)



    Address 08: Auto HVAC (8P0 820 043 BH)

    15:45:59 Group 001: General
    0.036 A A/C Regulating Valve (N280)
    59.5 % A/C Regulating Valve (N280)
    22.5 % High Pressure Sensor (G65)
    6.0 bar Refrigerant Pressure

    15:45:59 Group 002: Compressor Shut-Off Conditions
    0.0 Current Shut-Off Condition
    19.0 Last Shut-Off Condition
    0.0 Last but One Shut-Off Condition
    0.0 Last but Two Shut-Off Condition

    15:45:59 Group 012
    800 /min Engine Speed
    0.0 km/h Vehicle Speed
    0 Compress. Torque Signal Status
    5.0 Nm Compressor Torque


    Thursday,15,May,2014,15:52:38:26100
    VCDS -- Windows Based VAG/VAS Emulator
    VCDS Version: 12.12.2.0
    Data version: 20140212


    Address 01: Engine (8P0 907 115 AB)

    15:52:34 Group 050: Idle Speed Stabilization
    820 /min Engine Speed (actual)
    840 /min Engine Speed (specified)
    A/C-High A/C Readiness
    Compr.ON A/C Compressor

    The car is going in on Sunday to get the system checked and re-gassed if necessary. If it turns out the N280 valve is the culprit I have found a company in the UK which can supply them. I'm just waiting for confirmation.

    Any help in the meantime would be greatly appreciated.
    6 bar pressure is an equalised pressure if your ac was not in operation at the time the n280 valve alters the displacement of the compressor ,should you have a high cabin temperature or full speed vent fan the valve will have the compressor fully loaded to bring the suction pressure down once the load is manageable the valve will decrease the compressor capacity.

    as pressure and temperature are directly proportionate high pressure = high temp, low pressure = low temp
    less heat load = lower pressure however the capacity control is in place to deal with load variations due to engine speed and thermal load.

    when your system a/c is switched on the suction pressure (low side) will decrease and your discharge pressure (hp) will increase a good visual indication that is fully charged is the largest line (suction )will sweat (form condensation) on it right back from the evaporator to the compressor.
    davc likes this.

  4. #3
    davc's Avatar
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    Thanks mate.

    It sounds like the N280 has failed.
    MY'09 S3 Sportback |Gloss Black Mirrors |Buckets |Black Optiks |Open Sky |Light & Rain Sensor Pack |CH/LH Lights |RNS-E & No Highs No Lows it must be Bose |

  5. #4
    Boon's Avatar
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    I'd get the N280 changed before the regas as you'll likely need it done again after changing the valve
    54 8P2 A3 Sportback 2.0TDI BKD - Shark stage 1 - EGR delete - Dolphin Grey

  6. #5
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    There is no charge if the re-gas doesn't fix the problem so I'll get the system evacuated before changing the valve.

    If I go down the route of changing the compressor are there any parts I need other than the Receiver/Dryer and Expansion Valve?
    MY'09 S3 Sportback |Gloss Black Mirrors |Buckets |Black Optiks |Open Sky |Light & Rain Sensor Pack |CH/LH Lights |RNS-E & No Highs No Lows it must be Bose |

  7. #6
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    You don't really need to change the expansion valve however the drier is recommended but you could likely get away without changing it providing the system is evacuated properly anything less than 2 torr is perfect

  8. #7
    davc's Avatar
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    That's good to know, cheers again.

    P.S I had to look up torr on wikipedia. Every day is a school day
    MY'09 S3 Sportback |Gloss Black Mirrors |Buckets |Black Optiks |Open Sky |Light & Rain Sensor Pack |CH/LH Lights |RNS-E & No Highs No Lows it must be Bose |

  9. #8
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    Did you get the valve changed or the compressor? is it working now?

    Can you pm the details of the company that can supply the valve please?

    Cheers

  10. #9
    davc's Avatar
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    Hello mate, I haven't had a chance to fix mine yet.

    The company I used is Automotive Compressor Repairs Ltd - 01932 571980. If you ask for Craig he should be able to help you.
    TechFreak likes this.
    MY'09 S3 Sportback |Gloss Black Mirrors |Buckets |Black Optiks |Open Sky |Light & Rain Sensor Pack |CH/LH Lights |RNS-E & No Highs No Lows it must be Bose |

  11. #10
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    Thanks bud - I'll give them a bell ...

    Quote Originally Posted by davc View Post
    Hello mate, I haven't had a chance to fix mine yet.

    The company I used is Automotive Compressor Repairs Ltd - 01932 571980. If you ask for Craig he should be able to help you.

 

 

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