Air conditioning blowing through the wrong vents

Tiny
ATOMICDR
  • MEMBER
  • 1998 BUICK PARK AVENUE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 274,000 MILES
Air conditioning working fine one day and the next day it will only come out of the defrost and floor vents. It does not matter where you direct it via the buttons. It is a digital setup on the dash. Even if you attempt to make it only blow out of the defrost vents it nonetheless chooses to go out the floor and the defrost, likewise if you choose to make it go out the floor vents, it chooses both top and bottom, but never, no matter how you choose to direct it, does it ever come out the main dash vents. Which is where you want it in this 109 degree weather.
What is causing it and where do I look to fix it?

Thanks a ton, you guys are lifesavers, never failed me yet.
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Wednesday, July 13th, 2016 AT 4:06 PM

2 Replies

Tiny
WRENCHTECH
  • EXPERT
There is an electronic mode door actuator mounted on the left side of the HVAC housing. The actuator could be bad or some of the linkage could jammed up. You will have to look and see.
I cannot find any pictures of it.
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Wednesday, July 13th, 2016 AT 4:34 PM
Tiny
KEN
  • ADMIN
It can also be the Heater & A/C Programmer behind right side of dash, near rear of glove box. If its going out it will do what you have described. Check it out and please get back to us

Best, Ken
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Thursday, July 14th, 2016 AT 7:11 PM

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