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lbz coolant system issue

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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    Hello all, The coolant system in my LBZ started acting up. So far I’ve replaced thermostats, coolant temp sensor, coolant reservoir cap. I have not been driving the truck other than to test it during the past 3 days. It’s averaged 25° here in NW Ohio this week. Here are the last 3 scenarios...
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