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I just had this same issue. I went to local junk yard and pulled a complete rear housing assembly with the blend door. I also grabbed an extra blend door for the future. You can go to the local yard and remove a blend door from the rear ac housing assembly. It is easiest to reclaim the freon and remove the housing and undo the metal clips and slide apart.I realize this is about 8 years later lol - but do you remember what the end result was for fixing this? I have the exact same problem. The break even looks the same. Trying to figure out how to fix it.