Chevy and GMC Duramax Diesel Forum - View Single Post - Clutch fan engagement
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post #2 of (permalink) Old 09-17-2018, 07:50 AM
Hook'em_Horns!
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Look into opening up and cleaning your cooling stack out front.
Bugs, grass, debris can collect between the coils over time, restricting the flow of air to the fan clutch....which results in no heat detected and no full lock to cool down.

Peruse thru this thread, lots of pics of what kind of buildup you can find.
Spraying thru the grille at the car wash, won't do it. It needs to be opened up some to properly clean.
https://www.duramaxforum.com/forum/h...l-install.html

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