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Re: 72 A/C K20 no defrost help request
Most likely the flap in the diverter box is broken - basically, they all break.
This box is to the right of the one in your picture and is controlled by the "outlets" lever on your control; it sends the air either to the upper vents or the foot/defroster outlets. Take off the heater outlet box and then the S-shaped duct to the right, and you should be able to see or feel inside the diverter box if the flap is moving.
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1971 C10 Longbed, 350/TH350
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