2004 Ford Explorer 6 cyl Four Wheel Drive Automatic 78,000 miles
having a heater issue obviously. I have a 04 explorer and when I turn my heater on I get air flow but its cold air and there is a tapping sound behind the air conditioning/heater control panel when I turn the thermastate to red (heat). The sound goes away when its turned to blue (cold). Any ideas what that can be?