My air isn't working? on 2006 Chevrolet Monte Carlo

My air doesn't work at all I turn the knob to turn it on and nothing happens I've checked fuses and relays and no difference if I click ac button ac compressor turns on but nothing comes out from vents no air. If I move temperature knobs all the way down to cold temperature actuator starts clicking if I move the back up a little bit clicking stops. Does anyone know what could be going on?

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