I have a 2004 F-150 crew cab Laria and bench front seatt with very low miles. Last night we finally got some comfortable weather here in TX so I pushed the "off" button on the dash to shut down the electronic automatic temperature control (EATC). When I turned it off the floorboard blower fan came on high and doesn't go off. It appears to be the heater and is on full blast. The dash shows nothing like it should but there is still activity going on. I guess I could just keep the EATC set to 72 all the time but I would like the ability to turn it off completely. Has anyone ever heard of this before?