Since this says there is no cabin air filter I would asume this applies to all of the years that share this body style. I have looked through this 2009 expedition/navigator ford workshop manual and there is no mention of a cabin air filter. The reason that people believe that there may be a cabin air filter is because it is in the maintence manual that is just a general booklet included with almost every Ford SUV/Truck. The only 2009 production model of SUV/Truck that has a cabin air filter in 2009 is the Ford Escape.
Most odors are going to be inside of the system or odors in the car. There are remidies for this but are more complicated than just changing a filter. I wish it was easier because I have an odor in my expedition also.
I hope this helps everyone.