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My A/C does not blow out of the main vents. No matter what position the switch is in(Max, Normal, Vent,etc..), air blows from the dash(up by the windshield) and by my feet. What could be causing the problem? The switch itself? Something under the dash? The a/c still blows cold but won't come out of the main vents no matter what i do. It's starting to get hot here in South Florida so I would like to get this fixed. Thanks.
 

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The main vacuum source that goes into the cabin is the small hard line that goes from the vacuum tree on the firewall over to where the A/C liquid line connects to the evaporator. It's most common for this to crack and leak. Also, there is a one-way valve so that vacuum may charge the reservoir. Check this as well.
 
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