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sprinkles08, ASE Certified Technician
Category: Car
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Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Buick Park Avenue Ultra: The HVAC will not deliver air

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The HVAC will not deliver air to the mid range setting. I works of the de frost setting and the floor setting and both, but no teh mid range, so the barn doors are working. Can you help\ Bill XXXXXXX

Hello and welcome to JustAnswer!


There are actually two doors and two actuators that control airflow direction, so it's possible to still have floor and defrost working and not vents working due to a door or actuator.


The problem could be a bad actuator, stuck door, vacuum leak or pinched line in the dash, bad programmer or bad control head on the dash. The programmer is what actually controls vacuum to the actuators.


What you can do is remove the lines at the programmer and try moving the doors with a vacuum pump. If you can move the doors with a handheld pump then you know the doors, lines and actuators are ok, but if not then you know the problem is in the dash.


If you're able to move the doors with a vacuum pump then either the programmer or control head is bad.

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