cabin air filter location. on 2000 Ford Expedition

Where is the cabin air filter located on my 2000 ford expedition. My SUV has and stale odor. I got 179,000 miles on the SUV I don't ever recall replacing it. I've replaced the air filter ever year.

Asked by for the 2000 Ford Expedition
if you have one its located under glove box in a little trap door if not spray lysol in air intake vent on p/s of veh near wiper arm that will kill bacteria
Thank you. I'll give it a look.