Do you know what R1234 costs??...Good lord! Anyway I just have the charging kit for the low side. The condenser fan is running, the gauge is almost in the red,and the air coming out is cool at best. Speed the engine up to 2K RPM and the gauge falls back in green, and the air is cold. I shot some more freon in, but didnt seem to help.also the low side line gets cool but not cold.