2003 Lariat, 5.4 with the electronic climate control. Air only blows from the front dash panel. When I press floor or defrost, the display changes correctly, but the air flow doesn't change. I unhooked the vac line under the hood that goes to the controls and with that unhooked, I got air from the defrosters, which I understand is the default operation. So, Is there anything else easy that I can look at? Thanks, Tracka96