Hypothetical question about a fan clutch

[ababajoni]

I have a question so I demandated last week but engine when I start it for the first second is as quite as it was before I demandated then the tapping kicks in as if it needs the overhead ran but it was done at time of demandate 2014 kw cummins 2350 demandate done in Ga you guys know where. Had a mechanic tell me its needs to have over head ran again, so does it get a lot nosier after demandate. Truck runs great no other issues. sorry about asking in your question still haven't figured out how to start my own ?