2005 Dodge Durango

My A/C is blowing warm air in the front part of my SUV and cold air in the rear. When the setting is on low it blows somewhat cool, but the higher the fan goes the warmer the air. I have been told it is the damper doors and a possible vacuum leak, but have found neither. BTW the freon is full, I have charged and evacuated and charged the system.
July 14, 2007.

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