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Q: why won't blower fan blow out defrosters ? on 2002 Oldsmobile Alero

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
all fan speeds work but won't switch from floor to defroster outlets.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The defrost door is operated by the Red & Yellow vacuum lines, Per 'Mitchell'. The Blue & Green operate the Mode door which closes the vents. Don't agree with blend door, unless you have a heating issue.
If this vehicle has a vacuum harness to the vent control system, follow the line through the firewall to the vacuum pump and make sure there are no breaks in the line. You will know from past experience if it was a vacuum setup by when you adjusted the direction you probably heard an 'air slurp' as you switched from floor to defrost etc.
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When you select defrost vacuum should be applied to the blue vacuum line which pushes the defrost door open and the heater door closed, and the red vacuum line which closes off the dash vents.
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