You are likely not pressing "OFF and Floor" simultaneously. I have difficulty doing that too, be patient and try again and again.2007 Lincoln TC Signature. Silver Birch Mettallic.
Can't get the damm thing to do any self test. Things on EATC that (do) work are as follows: speed,temperature,off-on,recirc,in/out temp,f/c,auto,digital display.... only thing that doesn't work is the changing of where air comes out. Is currently coming out of (only) floor outlets.heat and cold (do) work. Really hoping it's not a (pull the dash) job.....
Your symptoms suggest the mode doors that control the air direction through the vents. There are two actuators and the dash must be removed for access. Replace both while you are in there. The two temperature control actuators and the recirc actuator can be replaced without removing the dash.