Fan
#2
Adminstrator-ess
It allows the computer to engage and disengage the fan clutch. Fan engagement is based on engine temp, under hood temp, road speed/engine rpm (for increased fuel economy), exhaust brake operation (fan kicks in to help slow the truck) and A/C pressure (makes the A/C work better) on "big truck" applications. I don't know how many parameters the Dodge PCM looks at when controlling the fan.
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