My 2006 Titan, recently developed a clicking sound, sometimes low and other times it is very loud, when I turn the AC. I was told by a parts guy at a Nissan dealer that it is one of 5 actuators. I was told the actuators are located under the dash. Has anyone out there experienced this same problem and if you did what was the fix? Any help is greatly appreciated. The clicking is not a pleasant sound to deal with especially on a long trip!!!