This is a 1986 SVO, and although the temp control and fan switch work, the lever that controls switching the airflow from windshield to vent, to floor, etc. doesn't work. I'm guessing it's a vacuum controlled unit, but haven't had a chance to get my head under the dash yet. I was hoping someone might have some ideas as to common known problems, things to look for, etc...
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HVAC steering problem - 
