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Discussion Starter #1
Ok guys odd problem. When I turn on my ac or heater the two side vents blow but i have to turn blower back down to zero and turn them back up to get middle ones to blow. Not a huge problem but kind of weird. Any thought?
 

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youve probably got a vacuum leak somewhere. the air flowing at first is keeping the air dam up/down for the middle vents, blocking them off. so when the air stops, they fall/ open. kinda like a shop vac when you knock it over, youve got to turn it off then back on to continue vacuuming.
this is just my theory.
 

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I had the same problem ill bet if you check under the passenger side fender well below the battery there is a vacuum line the runs to a computer and the rubber coupler will be split or broken off.
 

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Mine does the exact same thing. Thanks, now I know what to look for.
 

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I noticed mine kind of doing that but it was the side window defrosters if I moved the controls around I could get them to stop blowing.
 
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