I bought this 2002 Dodge Ram 1500 back in October. The blower motor seems to be fine but it only wants blow air out of the driver side vent and the lower passenger vents. It doesn't matter if I move the selector to the top vents or the lower vents it only blows air out of the middle driver side vents and the lower passenger vents. Any help would be appreciated.

 

mode door/ actuator failure. The mode door directs airflow between the vents or "modes" like defrost, vents, floor, etc. When they go you have no control over where the air goes. Do a search for mode door or blend door failure, theres tons of threads on it.