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Discussion Starter #1
I just bought a 2004 Duramax LB7 with 200K miles on it, the injectors were replaces way back under warranty. Today I drove about 1.5 hours at 75 mph the coolant temp did not break 175 but the coolant tank surged once and came out the overflow hose. is this something that I need to worry about?
 

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Discussion Starter #3
I'd check for a possible head gasket failure.
Let sit over night the upper radiator hose does not feel hard and I can squeeze the hose over half way collapsed with little effort, drove it about 70 miles and nothing else has come out the overflow hose.
 
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