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I have a 2005 duramax diesel gmc 3500 hd it keeps sayn low coolent we replaced the cap both thermastates and we have ran the truck at high rpm and released the air in lines. Top radiator hose has been replaced. When it seems to get warm it dumps out the fluid it looks like it's comen out over flow hose. When we check hose for pressure it was hard...what I have read it seems maybe a blown head gasket does anyone have any ideas?
 
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