Chevy and GMC Duramax Diesel Forum - View Single Post - Help smoking after down grade
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post #2 of (permalink) Old 09-09-2019, 04:11 AM
Gatordog
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Join Date: Sep 2018
Posts: 83
White smoke is coolant. Check your coolant level and also take the truck for a 15 minute hard run and see if the upper radiator hose is rock hard. If so it is head gasket time.
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