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The AC version only has a vent on one side that is controlled by the AC system. You can interchange them however you like. To get them out you have to lift it up and turn it to get it out of the hole.
just a quick question here. my 84 silverado swb has a manual vent on the drivers side and a another vent on the passenger side looks like its controlled with vacume is this true? truck has factory AC to. Im asking because I cant get the passenger side vent to open. its not siezed either. Thanks Marc