HOLD UP!!! It sounds like you need an evaporator. If what you are getting out of the drain that's on (or near) the firewall is anything but water, that's a problem. Now a few things that need to be cleared up that might help you out. Refrigerant is not oily. There is oil in the system that travels with the refrigerant, and it will leak out with the refrigerant. This is how the dye works. The dye is in oil, and will leak out with the refrigerant. The evaporator is what does the cooling, it is under the dash. The "restrictive device", expansion valve or orifice tube is right before the evaporator. a The condenser is out in front of the radiator, and the airflow across it will remove heat from the liquid refrigerant. Next, just recharging to a pressure on a gauge is not going to get you a proper charge with a R-134a system. In the days of R-12, that worked, but not anymore. With a R-134a system, you really need to have the system empty, then add the proper amount of refrigerant, by weight. The R-134a is not Freon. Freon is a brand name (I believe Dupont) for R-12. I'm not trying to bash what anyone has said here, just trying to educate!