Here's a good explanation of the features of the fan clutch and the default settings. You can change the web address from ISL > ISM > ISX, but they appear to all be the same. It looks like they all come from Cummins with the default setting at ENABLED with engine braking.
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Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Lifeline AGM's
2019 F250 King Ranch 4x4 Powerstroke - SOLD
2022 F350 DRW King Ranch 4 x 4
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