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If this means that you have no rear air at all, the problem is a cheap resistor that you can replace. Ask a parts house to find the part and show you where it is located. You can do it and it's a cheap, easy fix. If some air is blowing out of other rear vents, then the problem may be a fan and not just the resistor. Air can be blowing out of the front vents like crazy and the problem with the back can be as I described sense front and back have separate resistors.
check your vacuum lines that sevice the plenumm doors that redirect the air. A good kick in one of the foot wells under the dash can dislodge a conection. The other problem may be the main dash selector its self
the vent control is either vacuum (likely) or electrical.... you most likely need to find a vacuum leak.... start under the hood... you will see a round chamber with a vacuum hose on each end of it near the firewall and brake booster. it's slightly bigger then a film cannister. on my dad's van (also a dodge product) it is white. that is likely the issue....