Defrost doors stuck in the defroster position?

1998 BUICK PARK AVENUE
70,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHUCK BARTA
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  • 1 POST
A/C fan air blows through defrost vents only. Fuses checked okay, Module replaced. No change. Any ideas?
Aug 31, 2022 at 7:47 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
If all fuses are okay, this leaves the HVAC programmer which must be recalibrated. here is the location of the unit and how to set it up once replaced in the diagrams below. Check out the diagrams (below). Please let us know what happens.
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Aug 31, 2022 at 5:18 PM
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