I wouldn't recommend you try anything with your a/c.
There is a reason why, they have a special license/training to become and a/c technician.
2003 is a fairly new car, i wouldn't try messing with the system. The only stuff available to the public is that propane crap for r134a/r12 replacement.
Your car is still new, fill it properly with r134a, dont try that shit you seen at Part Source.