Hello: I purchased an R134a/R12 dual refrigerant recovery and recharge unit. I just changed the a/c pressure switch and drier in my car. The machine pulled and held a vacuum on the system. So, all of that is fine. However, I can't get the freon into my a/c system.

I'm using R134a because it had already been converted. I just want the a/c working now and will convert back to R12 later. The problem now is the "pressurizing tank" light on the unit keeps flashing. The manual states that I should start the car and turn on the a/c because there is a pressure difference that needs to be corrected. I did that and it is still the same.

The a/c compressor in m car is not turning on because there is no refrigerant in the system. It seems like I'm almost there, but I need that little push from the in house experts.

Thank you for your help.