Trouble with the heater fan. on 2007 Ford Five Hundred

The heater will not go off. When i have it on Auto, no matter what temperature the fan will not go off. when i turn it off the fan runs full blast. When I turn the fan motor down it does not make a difference.

Asked by for the 2007 Ford Five Hundred
It sounds like you may have a problem with the blower speed controller. Have this component checked.