Computer fan temp depends on what is programmed in the chip. The fans are also controlled by a fan delay relay that often fails allowing fans to operate even when car is not running. There is also a switch on the intake manifold that will turn the fans on if the temp is over 200+ degrees that will sometimes go bad causing fans to run constantly.
Not chasing down a problem, just want to know if once the fan turns on, will it ever turn off. Was thinking of driving something else off the ecm fan trigger.