Fighting coolant issues - Page 3 - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY 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 #21 of 24 (permalink) Old 11-30-2018, 10:17 AM
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Hook'em Horns is correct. Duramax's will not leak oil into the coolant and the engine pressures will #1 keep coolant out of the block, #2 make the Upper Coolant Hose rock hard. That is a tell tale sign of a blown HG. Check these guys out: https://www.littlepowershop.com/how-...o-do-about-it/

If you have them replaced, have the shop replace the Turbo Mouthpiece with the S&B and a new V-Clamp on the turbo body. Mine blew out 6 months after the HG replacement and cost me a new turbo.
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post #22 of 24 (permalink) Old 12-20-2019, 06:16 AM Thread Starter
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Problem was resolved. Head gaskets were bad. I had ryan at maxx performance do the work for me. I was planning on doing it all myself because that’s the kind of guy I am but with having a newborn and being gone for 14 days at a shot I decided to have a professional do the work for me. Turns out the up pipes on my truck were cheap ebays that’s cracked so I got ppe up pipes installed along with lml manifolds and had him add an egt gauge to pair with my cts2. Obviously I had it studded as well and had him put a new water pump on while he was in there. He treated me very well and gave me a good price. That was back in April and she still runs like the day I picked it up. Thanks to everyone that had helped me through the process. The dead give away was the rock hard upper coolant hose as stated above. Just never thought you’d need to do HG’s with 124k on the clock.
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post #23 of 24 (permalink) Old 12-20-2019, 06:24 AM
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Glad you got it resolved and thanks for updating!

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post #24 of 24 (permalink) Old 12-20-2019, 06:30 AM
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Just never thought you’d need to do HG’s with 124k on the clock.
Some early production '06 LBZs had the old style HGs that were used in the LLYs, (that were prone to failure) as GM used up the old parts before switching over.

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