A/C issue, won't go below 70 degrees. on 2006 Chevrolet Silverado 2500 HD

The air blows out fine, but I can't get it below 70 degrees. I recharged the 134a, cleaned the radiators etc. What else should I look at?

2 answers 1 comment
what ar your high and low pressures?
low side is running at 50 and high is 250
Possible AC/HEATER door actuator problem. Hot air mixing with cold.