Chevy and GMC Duramax Diesel Forum banner


  1. Aux fan / whoosh sounds at low RPMs (sometimes)

    11-16 LML Duramax Powertrain
    We have about 3500 mi on our new LML. Since new, it has sounded as though the auxiliary fan was engaging at idle at what seem to be random intervals. The fan will stay on through the first couple gears after a complete stop at signals/stop signs then sounds like it turns itself off. Some days...