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Air box fan staying on

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by IANF67, May 5, 2014.

  1. IANF67

    IANF67 Member

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    Hi folks
    went out to find my b6 cab as dead as a dead thing this morning, began by attaching jump leads which got it goin but noticed the motor inside the air filter box starting and stopping constantly. I didn't even know it had a fan in there lol. Is there anything I can do. Can I disconnect it? Do I need it working?
    Any help is most welcome
    cheers
     
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  3. Greeny233

    Greeny233 Avants are just better!

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    Don't think there is a motor in the air filter box. It is literally a box for the air filter.
     
  4. IANF67

    IANF67 Member

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    I could be missing something then but it definitely sounds like a mini hairdryer coming from inside the box
     
  5. BlackQuat

    BlackQuat Well-Known Member
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    Is it petrol? Might have an auxiliary air injection system.
     
  6. IANF67

    IANF67 Member

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    Yeah mate it's the 3.0l V6
     
  7. BlackQuat

    BlackQuat Well-Known Member
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    My old Vectra used to have a air injection system that pumped air into the exhaust manifold.
     
  8. IANF67

    IANF67 Member

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    Deffo have a fan spinning in the air filter housing. Booked in on Friday morning. Anyone know what it does?? Does it have a relay or a sensor that might be at fault ?

    Cheers
     
  9. IANF67

    IANF67 Member

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    Turns out it's the secondary air injection fan. Needed a new relay. It's under the ecu which is under the plastic shroud at bottom of windscreen on the drivers side. Just incase anyone else has the same problem

    Cheers
     
  10. BlackQuat

    BlackQuat Well-Known Member
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    Damn I'm good.
     
  11. jbcalvin

    jbcalvin Member

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    Is it just petrols that have this or diesels as well...... My car is making the same hair dryer sound intermittently when turned off..... 1.9 tdi
     
  12. BlackQuat

    BlackQuat Well-Known Member
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    Pretty sure the diesels don't have it.
     

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