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It is the rear Blend door it controls hot to cold air this is a weak spot on this model it is easy to replace but make sure you get a autolite brand Amazon is the best place to get them I tries one from NAPA and it failed in 2 months there are a lot of videos on UTube on how to change outThe rear a/c blower on my '03 Expo has started to make a popping noise whenever I run the rear a/c. I pulled of the rear tray to get a closer looking and it almost sounds like there is a ball or something that just keeps getting tossed around by the blower. Of course the factory warranty just expired so I'd like to at least give a shot at trying to figure out the problem myself. Has anyone else had this problem and if so, how did you fix it?
Thanks,:shootout: