Chevy and GMC Duramax Diesel Forum - View Single Post - Help smoking after down grade
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post #3 of (permalink) Old 09-09-2019, 05:59 AM
SilverGorillaLML
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Join Date: Feb 2015
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When checking the upper rad hose you want to get it up to temp be hard on it then let it sit for at least 5+ hours. If it's hard after that your keeping pressure in the system and 98% of the time headgaskets . If you take the degas cap off it shouldnt have any pressure left in it either. Can try replacing it before headgaskets as its 12 dollars compared to 1k to 4500

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