the hot **** controls a electric motor that moves a hot air mixing door inside the duct. not uncommon for the door or arm on the door to break with extended use. Old style and new style "blend doors" vary by age of the truck. Like ragtop said, what year? Or you can search for "blend door" on the site.
2002 SuperCrew 4 x 4 5.4 XLT -110K miles -NEW
2010 EDGE FWD - V6 ----------34,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
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