January 4, 20179 yr The buttons are vacuum valves. Vacuum actuators move the doors to rout the air. A lot easier to see when the heater box is out of the car, which unfortunately involves removing the dash. First thing is to see if you can get eyes on those, see if they move.
January 4, 20179 yr Make sure your vacuum connections under the hood are all connected, and not leaking.
January 4, 20179 yr Make sure your vacuum connections under the hood are all connected, and not leaking. +1
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