Help! Lincoln Fan Problem

I have a 1996 Lincoln Continental, and when you turn off the ignition the fan keeps running. This just started today. Later, when I restarted the car, and set the heat/ac to "auto-heat, the
fan came on. What could be the problem? I would appreciate it if someone would point me in the right direction in solving this problem.
I await your expert responses.
Thanks, Tom
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.