I searched a lil and i think my problem is the blend door.(blows hot air no matter what..unless i turn it off)But one thing i havent read about is the temp knob itself... in my past fords when turning it to one temp or the other it had resistance. My knob has no resistance, or no where near as much as i think it should, but the white spindle the knob is on is turning.??? any ideas or links, could that even be a problem