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coolant level

  1. Coolant Issue

    General Discussion
    Have a 2011 lml experiencing low coolant. First started after driving a couple hundred miles knowing the coolant level was where it needed to be. Gradually got worse over time, but no change in performance. Recently had a large drop in coolant but the truck had been sitting for a good while as...
  2. Need Help. Coolant Level / Tranmission Hot

    04.5-05 LLY Duramax Powertrain
    2005 GMC 2500HD 4x4 150,435 miles. In the fall of 2010 my Low Coolant Warning came on. My level was low but no signs of a leak. I filled it and about 3 weeks later it came on again. I filled it and never had the warning again until 3 weeks ago (June 2011) It came on again, level was low...