A/C not blowing cold air?

A/C was not cold. I tried Freon but the gauge was beyond max in red range to see mechanic. I replaced very dirty cabin filter. A/C worked for a few minutes then air temperature. Compressor clicks as coming on the off I verified the A/C relay and fuses were good. A/C was working slightly until I fixed it. The air actuator gives hot when turned to heat but just blows air temperature when turned to cold.