AL OF THE AIRFLOW COMES OUT OF THE DEFROST VENTS...
2004 Ford F-250
Al of the airflow comes out of the defrost vents regardless which setting is chosen
Saturday, October 20th, 2012 AT 5:35 PM
Check for vacuum leaks under the hood to inside the truck.
There are mode doors that can get jammed with debris. They need to be checked.
Saturday, October 20th, 2012 AT 5:37 PM
Edford, can you hear anything moving in the airbox under the dash when you change from heater to vent to AC to defrost? Also check to make sure all cables, wires, and vacuum connectors are properly connected.