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AC not working on a 2011 sierra slt

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I have a 2011 Sierra slt, the AC button will flash three times and then turn off, only ever blowing hot air. I had the system professionally checked for leaks and they said there was no leaking in the system. I then changed the ac line pressure switch and the ambient air temperature sensor, and I'm still having issues. Can anyone help me out as to what my next step might be?

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