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usually when you only get cold air or heat on one side of the car, this indicates that a "blending door" isn't opening and/or closing properly to direct air in the right direction. These doors or flaps are often regulated by vacuum, although some are electronic. On entry level cars, they can be activated by cables. So you'll have to dig underneath and find out which door is not being pulled or pushed by its activator, and then find out what works the activator, and then find out if its the activator itself, or the device that controls it, that is giving trouble.
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