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  1. Duramax Second Generation: 2004.5-2005 (LLY)
    I have an 04.5 LLY with 216,575 miles on it and twice the low coolant light came on in about 2 months. When I add coolant it's only maybe half a gallon low. The upper radiator hose is still nice and soft early in the morning after being parked overnight. Even after it's been running for a couple...
  2. Duramax Fifth Generation: 2011-2016 (LML)
    2011 LML with 120K. Towing my fifth wheel on a level road 6 miles from my house, I noticed my cooling fan was running. When I looked at my temp it was 260 deg. with a low coolant message and smoke started to come from under my hood. I pulled off quick and shut the truck off. When I got out and...
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