2004 LB7 Duramax - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 3 (permalink) Old 04-22-2019, 08:20 AM Thread Starter
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2004 LB7 Duramax

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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post #2 of 3 (permalink) Old 04-24-2019, 02:26 AM
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I'd check for a possible head gasket failure.

2003 2500HD 6.6 duramax (LB7) all stock (no mods)
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post #3 of 3 (permalink) Old 04-24-2019, 08:15 AM Thread Starter
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Originally Posted by MeBucko View Post
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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