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DASH AIR VENTS

Tiny
DMCGEE
  • MEMBER
  • 1997 OLDSMOBILE 88
Interior problem 6 cyl Front Wheel Drive Automatic 74000 miles
no air from any dash vent only floor and defroster. Have replaced ac programmer module and all levers move. The flow will change according to diff. Button pushed but not dash vents. I have move the door lever by hand and it moves freely. Why no dash vent air flow? Where do I go from here? Thanks
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Friday, July 10th, 2009 AT 7:31 AM

7 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Have you checked the vacuum supply line? If broken, the system defualt to defrost.
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Friday, July 10th, 2009 AT 7:48 AM
Tiny
DMCGEE
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  • 5 POSTS
Before I replaced the ac program module I checked the vacuum and it pulled good. Also the vacuum inside the module is good. And it makes the control arms move. Is it possible that the blend door is broken inside the unit? If so will I have to take out the whole dash to get into the box? Thanks
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Friday, July 10th, 2009 AT 7:53 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Here's the diagram of your system, it could be one of the mode doors stuck, or the actuato could be NG if you have a vauum tester/pump, apply vacuum to them and see if the lever on them move, if the hold vacuum, maybe a diaphram on it is bad...


https://www.2carpros.com/forum/automotive_pictures/62217_88a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_88b_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_88c_1.jpg

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Friday, July 10th, 2009 AT 9:47 AM
Tiny
DMCGEE
  • MEMBER
  • 5 POSTS
THANKS, for the info! I have a lot of work ahead of me. I will let you know what I find.
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Friday, July 10th, 2009 AT 9:49 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
I'll be checking on you!
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Friday, July 10th, 2009 AT 9:51 AM
Tiny
TSBARKER13
  • MEMBER
  • 1 POST
This sounds like what I need to check, but how to I gain acces to the vacuum hoses behind the control to check and replace? (1999 Olds 88)
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Tuesday, August 8th, 2017 AT 1:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,345 POSTS
Hello,

These cars had a big problem with the blend door actuator. Here is a guide to help you (below)

You can get them on Amazon.

https://www.amazon.com/gp/product/B004SF0Y4K/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=2carprcom-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B004SF0Y4K&linkId=4c34365bea3e2c974fbd8faf0f061e7a

Here is a guide to help you get the problem fixed.

https://www.2carpros.com/articles/replace-blend-door-motor

Please let us know what happens.

Cheers, Ken

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Saturday, August 12th, 2017 AT 5:58 PM

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