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'00 HVAC actuator questions

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I recently bought a 2000 Silverado 1500. The heat/AC is stuck in middle vent option, no defrost. Other than this it seems to work fine, and I've read about the actuator that probably needs to be replaced. Before I do that, is there any chance the problem could be within the HVAC switch panel instead of the actuator, and if so, how can I check?


Additionally I'm not sure how the button for recirculate/exhaust on the blower is supposed to work. When I press it, the LED blinks and nothing happens, regardless of any other settings. Is something broken here or is it just telling me I don't have that option with the bad actuator?? Or is there another actuator for this part?


Am I "allowed" to chose recirculate or vent in any mode or is that only for A/C like it is in some other cars? (It doesn't seem to work with A/C either) This is my first GMT800...

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