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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?

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