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Radiator staying on when all turned off?

A3Kent Oct 24, 2012

  1. A3Kent

    A3Kent Well-Known Member

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    Hi guys

    Any reason why every so often my A3 2.0 TDI 170's front radiator is staying on for about 5 minutes after i've turned the engine off etc? It's done it twice now and happened tonight after returning home on my usual 13 mile journey home from work, I wasn't exaclty thrashing it either.

    Thanks
     
  2. a6_chris

    a6_chris Well-Known Member

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    DPF regen interrupted I'd say.
     
  3. mjr901

    mjr901 Guest

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    you mean the fan.....?
     
  4. A3Kent

    A3Kent Well-Known Member

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    The fan on the radiator then...
     
  5. NHN

    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    Do you run aircon all the time or just occasionally & was aircon on at these times.
     
  6. Staz

    Staz is a retronaut Moderator VCDS Map User

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    Have a read of this thread:

    possible radiator fan problem

    It's a common problem on A3s.

    Please have a look at the FAQs thread too, that's where this link came from.
     
  7. jb0o

    jb0o North East Forum Moderator Site Sponsor Regional Rep VCDS Map User

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    Fairly common fault.

    Open the bonnet with the engine running an AC off and watch the fans. Only the large radiator fan on the right should be moving.

    Now turn on the AC, wait a few minutes and keep watching the fans. If the smaller fan still doesnt move and the large radiator speeds up and sounds like an aeroplane taking off.. The fault is with the smaller fan.. £150 for fan + labour.
     
  8. Daggerit

    Daggerit Well-Known Member Team Floret Silver TFSI Owners Group Team V6 Audi S4 quattro Audi Avant Owner Group

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    Or the DPF re-gen has been interrupted as A6CR says. I get this on the A4 from time to time, usually with a slight smell of burning (I'm assuming from the increased tempteratures needed for re-gen)...
     
  9. A3Kent

    A3Kent Well-Known Member

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    Always stays on mate.

    I'll try this out.

    This is helpful too -
    http://www.audi-sport.net/vb/air-conditioning/57270-air-con-climate-control-faqs.html

    It's possible that's it's normal behaviour as my air con is always on.

    I'll do some tests and report back.

    Thanks chaps.
     
    Last edited: Oct 25, 2012
  10. A3Kent

    A3Kent Well-Known Member

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    I should also mention that the car was checked for error codes via VCDS only last Sunday and no errors were present....
     
  11. audicruiser

    audicruiser Audi Heaven

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    Sounds like the common fan problem as this shows no errors. Get it sorted though as you'll come back to a flat battery!
     
  12. A3Kent

    A3Kent Well-Known Member

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    its only done it twice in about a month though, both times it's gone out in about 5 minutes. Surely that won't flatten the battery?
     
  13. eric barrington

    eric barrington New Member

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    hi

    try the temp 3 pin switch situated screwed in the radiator, this keeps the fans working after the engine in switched off and works on a temp in the radiator, cheap to change, also is the engine temp normal if is reading high the fan will run on after switching off
     

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