1998 Buick Lesabre dash venting

Are you saying it is slow to switch from windshield to dash vents?

Air Delivery Improper
Step
Action
Yes
No

1
"Â Engine idling.
"Â Check for vacuum on the main vacuum supply source at the HVAC Programmer Vacuum Line Connector.
Is vacuum present?
Go to Step 2
Go to Step 5

2
Using a vacuum pump, apply vacuum to each actuator line at the HVAC Programmer Vacuum Line Connector.

Do all the lines hold vacuum?
Go to Step 3
Go to Step 4

3
Inspect the actuator doors for binding.

Did you find and correct the condition?
Go to Step 7
Go to Step 6

4
Inspect each vacuum line for an open or restriction, if no open or restriction was found replace the appropriate actuator.
Go to Step 7
--

5
Locate condition and restore vacuum to source line.
Go to Step 7
--

6
Replace the HVAC Programmer.
Go to Step 7
--

7
Operate the system in order to verify the repair.

Did you correct the condition?
System OK
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If I remember correctly, they are under the passenger side of dash.(Behind glove box)