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  1. Interior
    On my 03 when the fan is on setting 3 or higher (it gets louder the higher the setting), I can hear a roaring noise under the dash. It only makes the noise when the recirculation is on. If you turn it off it quits when you turn it on it starts right away again. We have another 03 at work that...
  2. 07.5-10 LMM Duramax Powertrain
    I have a Silverado 2500HD crew and a CST 6" lift with 35" tires installed after 5000 miles. I now have 52,000 on her. Never had any issues with the 4wd system until I was in heavy rain a couple months ago traveling about 40mph and switched in to 4 high. I heard a terrible roaring sound and...
1-2 of 2 Results