only thing though, when using a refridgerant like that, you have to suck all the air out of your system. Will have to somehow set your system up to a pump to bring rh pressure in your line down below atmospheric pressure, so that when you put the coolant in, the pressure will suck the coolant in, inplace of the air. And also to get that kind of system workin good, you will need an evaporator. heck, just look at a model of how an ac system works. Just using refridgerant liquid, i dont see how it would mak it any cooler since your not gunna be turning it from a liquid to a gas and back to liquid, unless your going the whole 9 yards with it lol, with coolant, you get the "cool" when it changes forms.
i dunno, i just figure i would give my input lol, cause i just upgraded my mustang from r12 to r134.
see, i drained and flushed all the r12.... i then put the r134in it without sucking the air out of the system.... the second i put the refridgerant in, lmao one of the pipes turned to ice and cracked, because the refridgerant cant be exposed to air or it will freeze.
So, if you do do this, i hope it works for ya, and i hope i was helpfull in some way lol