If r3dletterday wants to see if it'* the charge in the AC system, on a warmer day 55 and above, turn on the air conditioningn and see if the clutch on the AC compressor is turning the middle part. That means it'* engaging (always a good sign) and then feel the accumulator, the large silver can on the passenger side, to see if it'* cold. Or feel the tube going to the AC condensor in front of the radiator; the one should be hot after a minute or so of operation.
Inside the car..., if the vacuum line is not connected under the hood, the air will come out the defroster 90% or more. A little will come out the heater openings at the bottom. That would occur no matter what setting the buttons are on because there'* no vacuum to control the flow vanes to change the flow path.
If r3dletterday is able to change the flow path by pushing buttons, then the vacuum is most likely okay. If the only failure is to come out the dash openings for the usual air conditioning flow settings, then the rubber nipples on the vacuum lines most likely have failed. There is a fix to bypass the connector or some have gotten it apart and reamed out the opening and got it back together.
If the air flow path is changeable but the temperature does not change with the digital temp setting, then it likely is an actuator motor. But take off the hush panel and look for the movement of the motor.
Dual auto air on both