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sounds like blender actuator door. this is a small door that allows the heat and ac to flow where directed. changed mine. wasn't the easiest job in the world but only because of the space to work with. first you have to take the radio out and once its out you can see the actuator right inside the space below where radio was. easy to change from there and cant really remember price of part, but don't remember being too pissed about it so it probably didn't cost too much. really not a hard job, go for it, I had next to know mechanical ability and I successfully fixed mine.