Can you access the ACARS c/b on the flight deck?
As detailed above, you do not need to deactivate "ACARS" as a system. All you need to do is prevent it transmitting...
On some types, just switch VHF3 from "data" to use it as a radio - ACARS cannot now communicate. I imagine if you turn off the Satellite link you'll get rid of that route as well...
NoD