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Radiator fan keeps running?

Discussion in 'New A3/S3 (8V Chassis)' started by Mjs, Mar 30, 2014.

  1. Mjs
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    Mjs New Member

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    Just noticed on my last two trips out that the radiator fan runs flat out for about 5 minutes after I've turned the car off. It hasn't done this since owning it (three weeks now) and wondering if this is a fault (no engine mgt lights on though), or is it doing it because the weather has warmed up a bit so it's just serving its intended purpose. Any thoughts anyone?
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  2. andy203
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    andy203 181 BHP

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    Not sure what engine you have, but my Golf GTD does this now and again, it's all to do with the particulate filter regeneration.
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  3. smudger69
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    smudger69 Member

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    Its doing a regen of the DPF. Burning off the soot in the filter.
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  4. Vertigo1
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    Vertigo1 Well-Known Member

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    Yep, it's normal, although very annoying and way worse than any previous A3 I've had.

    This is my last diesel, the next one will be a petrol or hybrid.
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  5. RVP20
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    RVP20 Member

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    How often does this happen? Is it like every 3 weeks?
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  6. pedro61163
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    pedro61163 Member

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    Mines does it now and again seems to be on short runs
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  7. Daz Auto
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    Daz Auto Member

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    ... this is a normal DPF regen.

    DPF regen = Diesel Particle Filter regeneration.
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  8. yetirider
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    yetirider Active Member

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    Mine does it, and always as I drive up the short drive up to the house in 2nd gear.
    Always as soon as I turn it off
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  9. Mjs
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    Mjs New Member

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    Thanks for replies everyone. It is a diesel so this DPF regen process make sense. Doesn't sound like I need to book an appointment at the dealer just yet then.
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  10. Zygote
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    Zygote Member

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    I experienced this myself and since Ive never experienced this on my BMW 1-series (2012 and 2010 models) which both were Diesels I was convinced something was wrong. I called up the dealer and they said it was the cooling system. I guess they were wrong but at least DPF regen is normal and nothing to worry about.
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  11. Vertigo1
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    Vertigo1 Well-Known Member

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    The biggest giveaway that a DPF regen is in progress is the idle speed rises from 800rpm to 1000rpm. If this is happening when you turn off the ignition then you'll get the protracted fan issue as the engine and exhaust run very hot during the regen process.
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  12. Andy1608
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    Andy1608 Member

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    As said by all others. Mines the same too. Just worry when it stops doing it lol
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  13. StefRobinson
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    StefRobinson Active Member

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    This is the first car I've had with a DPF. The first I know about it is the start/stop gets disabled and my fuel economy starts to go down. It's quite annoying. It's also rather noisy and a bit embarrassing when you stop the car and turn the engine off and all you can hear is the radiator fan going hell for leather. It sounds even worse in the garage!
    #13

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