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I have the automatic dual zone unit, and no matter how low I set it, there is no power output of the vents. I have recharged the freon, with no change. I can hear the fan get louder, but the cold air doesn't blow out any harder. Any ideas?
Sounds like a typical vacuum leak problem. Usually caused by leaking battery acid which damages nylon vacuum lines located below or behind the battery. Check the battery for leaks.
The battery did have an issue several years ago with a leak that damaged something to do with the HVAC system, however, this was replaced and the Optima Redtop that I have has never had problems.