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Hopefully this post will be much easier to understand.. Ran a self test on my ACC unit and it came back with a zero.. But my issue is air only comes out of the defrost vents hot or cold.. It wont come out of the front facing vents or the floor vents.. If it does its VERY little.. Why? Are these vents controlled by Vacuum hoses? If so where do I start to find issue? Thanks
 

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Classic issue with the diverter drum in the air box.

Well documented way in the archives to use a screw to try and ease the problem.

At worst, the stepper motor can't turn the drum and has started slipping. Again, well documented problem and fix in the archives.
 
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