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cooling system issue
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  1. Duramax Second Generation: 2004.5-2005 (LLY)
    Give you the back story. A year ago my truck started slowly pushing coolant out of the coolant reservoir. I changed the cap and the issue lessoned. 2 months later the coolant low level light came back on. I was back to putting coolant in every 2 weeks. Then the upper rad hose sprung a leak...
  2. Duramax Fifth Generation: 2011-2016 (LML)
    Like the tittle says :16 LML coolant do not go back to pressurized side when cool off. the coolant stand in the middle Of the pressurized side and do not pull back what is in the overflow when cool off. Top rad hose is soft in the morning, new thermostat and new coolant tank . ( weird is when I...
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