Daewoo/Doosan Puma M Code for Air Blast

We're running a bunch of Teflon bar through the old Puma 230MS(Fanuc 18iT) and would like to run constant air blow during the rough and finish passes to keep the chips out of the way, but turn it off for parting. The normal spindle air blow spins the spindle slowly and only lasts for a certain amount of time, which doesn't work during machining. Our machine is equipped with what looks like 4 extra unused M Codes, and we have extra air solenoid capacity, so we thought it would be as simple as calling one of those M Codes to control the solenoid on/off while running, but we're not able to machine while calling any one of those extra M Codes, M91-94 if the numbers mean anything.

I'm not trying to reinvent the wheel here, just want to turn on some air here and there and turn it off during the rest of the part program. Am I missing some glaring solution here, or is this more difficult to install than I think? Thanks.