Where is the cabin filter on a 99 mercury mountaineer?

In a 1999 Mercury Mountaineer, the cabin air filter is located behind the glove compartment. To access it, you need to open the glove compartment and remove any contents. Then, you can detach the stops on the sides of the glove compartment to allow it to swing down, revealing the filter compartment. The filter can then be pulled out and replaced as needed.