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air con clutch or control module fault???

Discussion in 'Air Conditioning' started by Markeyboy, Mar 24, 2012.

  1. Markeyboy
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    Markeyboy Fan of the R-Tech!

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    [Mar 24, 2012]
    iv had no aircon since i purchased my a3 over a year ago

    when i switch the aircon on (econ off) the second fan at the rad comes on, but the clutch for the compressor does not come in

    i have got the plug off of the compressor and measured the voltage across it, it seems to be a constant 9 ish volts regardless of the air con being on or off, and when switched on the volts rise to 10v for moment and then back to 9v

    i have not been able to get to the connections on the compressor to check the coil (assuming there is one in there???)

    i dont get any vagcom faults when scanning the car relating to aircon, is there anything else i can check?
    #1
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  3. Markeyboy
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    Markeyboy Fan of the R-Tech!

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    [Mar 29, 2012]
    Any one?
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  4. Markeyboy
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    Markeyboy Fan of the R-Tech!

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    [Apr 6, 2012]
    Please help me, I'm too hot =(
    #3
  5. danphipps
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    danphipps New Member

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    [Apr 8, 2012]
    I have just the same problem but when i switch the econ button on ( air con off) my 9 volts go, the only thing switching the bair con on/off is this 9volts to the compressor if 9 volts isnt there it sont engage if it is there the clutch should engage. I have been looking on the internet and dont entertain the idea for a second hand compressor but the cheapest i have found is 210 + vat from a website called fastrads its a common problem with these cars and a/c pumps some audi garages deny it others tel you its very common, replace the compressor and it will solve all your troubles let us know how you get on
    #4
  6. Markeyboy
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    Markeyboy Fan of the R-Tech!

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    [Apr 10, 2012]
    when i get chanve im going to make up a plug to chech the resistance through the coil in the clutch, then stick 12v up ity and see if it opperates,

    will probably be next week at the earliest
    #5
  7. Andy_TDi
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    Andy_TDi New Member

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    [Aug 12, 2012]
    Yup i'm having the same problem i even ran a 12v supply seperately to the compressor it's self still no aircon nor does the clutch plate engage so it's looking like a new compressor also resistance is 10ohms where from what i've read it should be 3.6ohms
    #6
  8. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Nov 15, 2012]
    Have you tried a new clutch relay?
    #7
  9. nddy
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    nddy New Member

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    [Feb 16, 2013]
    I am experiencing a similar issue my a4 b6 compressor clutch fell off.

    Attached Files:

    #8

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