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Cooling Fans Staying On

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  • Cooling Fans Staying On

    I’ve noticed on the last couple of trips that the cooling fans are staying on for a short while after switch off on my Wolfsburg.

    Temp gauge is halfway at 90c, no errors showing in ODBEleven.

    Any ideas?
    2023 MY22 Arteon R-Line Shooting Brake
    2016 MY17 Golf 92TSI Comfortline Wagon
    Previous - 2019 MY18 VW Passat Alltrack Wolfsburg Edition

  • #2
    Is it a diesel? If so, then your diesel particulate filter (DPF) will be trying to regenerate and clear itself out. The engine fans run at full speed while the DPF is going through the regeneration process, and if you turn the engine off while this is happening, the fans will continue to run for 10-15 mins. You can usually smell something and feel extra heat coming off the exhaust too.

    Unfortunately there is no sign that the car is going through this procedure (eg no lights or warnings on the dash). You can use an app called VAGDPF which you might be able to use with your OBD11 module to check how full your DPF is and so you know when its full to take the car for a 30min drive to let the DPF do its full regeneration process.

    Have a read of this to give you info, paying attention to the Active Regeneration section as this is the one that will apply to 95% of situations: The diesel particulate filter explained | AutoGuru

    VAG DPF app on Android to monitor DPF
    Last edited by Lucas_R; 17-06-2022, 09:26 AM.
    2017 Ford Fiesta ST the go kart

    2015 Audi SQ5 bi-turbo V6 TDI family hauler

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    • #3
      Ah, yep, sounds like that could be it then, I did notice a slight difference in smell. Thanks for the info, will take a look.
      2023 MY22 Arteon R-Line Shooting Brake
      2016 MY17 Golf 92TSI Comfortline Wagon
      Previous - 2019 MY18 VW Passat Alltrack Wolfsburg Edition

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      • #4
        Yeah mine used to do that, nothing to worry about , perfectly normal
        2021 Kamiq LE 110 , Moon White, BV cameras F & B
        Mamba Ebike to replace Tiguan

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        • #5
          Thanks guys. Took it out for a motorway stretch at the weekend and all sorted now.
          2023 MY22 Arteon R-Line Shooting Brake
          2016 MY17 Golf 92TSI Comfortline Wagon
          Previous - 2019 MY18 VW Passat Alltrack Wolfsburg Edition

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          • #6
            Originally posted by StefanVXR8 View Post
            Thanks guys. Took it out for a motorway stretch at the weekend and all sorted now.
            good to hear. a 30+ minute run on the freeway is the best way to let the DPF regen process take place. Might be worth investing the $5-7 dollars in the VAGDPF app so you can check how full your DPF is periodically and so you know when to take it for a freeway run.
            2017 Ford Fiesta ST the go kart

            2015 Audi SQ5 bi-turbo V6 TDI family hauler

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