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I just worked on a 1997 Ram Xcab 4x4 last night. 'm not sure if it is the same but- The blend door was actuated by a cable and was located on top of the heater box assembly just beside the actual heat coil. The dash must be removed before it can be accessed. It is really not too bad. I removed the heat coil and checked/cleaned it and then reassembled everything in about 3 hours. The blend door didn't have any problems on my truck. The actual problem was in the heat coil. It was not installed correctly in the box.

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Q: Where is the heater blend door acuator on a 1999 Dodge Ram 1500 and how do you replace it?
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