I am having a problem with my 2000 V6 Mustang convertible's temperature control for the heat-AC. No matter the setting, I get full blast hot air. The vaccuum controlled items are working (I can switch between defrost, dash and foot vents) without a problem. My Haynes and Chilton manuals aren't real clear. Is this a cable control or a motor? Has anyone had this problem and knows how to fix it? In case it was an option, I have manual, not automatic heating controls. Thanks!