why does the heater click when you turn it on and no heat but fan still blows on 2007 Ford Explorer

The fan blows cold air but clicks when you transfer to heat and heat doesnt come out most of the time. Like something is stuck?????

by in Trussville, AL on May 12, 2013
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2 answers
ANSWER by , May 13, 2013
check your blend door on your heater box fords are famous for broken doors
ANSWER by , May 13, 2013
or the actuator that controls the door