I have a 1993 ford taurus 3.8L V6 automatic GL. I bought the car used in 1998. I have never had the A/C system serviced. It works but now my a/c system is taking longer to get cold. It isn't real bad but I think it might be getting low on freon. The problem is I don't know what kind of system I have with my car. Is it a R-12 or R-134a a/c system? How can I find out?