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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    So as stated in my post from a while back, I was under the impression I had headgasket problems. But now Im starting to think it could be a blocked up radiator (not heatercore because I already bypassed it to see if that would help). I ran the truck pretty hard yesterday and when I came outside...
  2. Duramax Second Generation: 2004.5-2005 (LLY)
    Sorry guys if this has been covered over and over. I had a bad waterpump that was leaking alot of fluid so I replaced it with a welded unit over the weekend. I also replaced the housing as well. Both with ac Delco parts. I did use a felpro gasket on the black tube with two 12mm studs that...
  3. Duramax Second Generation: 2004.5-2005 (LLY)
    My truck has had a very slow coolant leak for a long time. I am doing a long trip to move my daughter halfway across the country so looking to check things over in more detail before the trip.... I did a combustion leak test on the coolant reservoir and it doesn't look like a head gasket...
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