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I think pulling the fuse may have finally done it after the new control module was in. I'm guessing my old actuator was fine, but I tore it apart and after all of its grinding itself to a stop, I might as well keep the new one in. I'm going to put it through its paces this week, but I'm optimistic that it's finally fixed. It seems to be moving back and forth from hot to cold as needed. Sweet!