I believe this is all temperature dependent, check the operation instructions in the owners manual. I believe the center vents only provide cooled air, so if it is fairly warm where you are, try dialing down into max cool and wait. It may take several minutes. Once the climate control has figured out "Hey, I need to cool off the interior" it will send cooled air through the center vents. If it is already cool where you are, this may not happen, although Max Cool should send at least a little cold air through.
Gilly
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