There should be multiple selections for defrost, some have the ability to split the air to the top and the bottom, make sure you are using the right selection. If you are already using the bottom air only selection, one of the wires connected to the rod from the back of the controller knob may have come off. Any a/c shop should be able to help you with this. You might also try the free online service manuals at:
http://www.autozone.com/autozone/repairinfo/repairInfoLanding.jsp
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SOURCE: Defroster & floor blowers don't work but front facing vents do
There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.
SOURCE: airflow problem through ac vents
Your selector panel is bad, ( temp, blower, ect.) all one unit, my 95 did same thing chg. that unit and it fix it.
SOURCE: defroster is the only place the blower will
Check for a loose vacum line under the hood over by the fire wall on passenger side if no vacum at that hose add vacum.Good Luck.
SOURCE: 2002 ford explorer....Just changed the
Check under dash in duct system for any vacuum hoses blown off then check under the hood on the passenger side of engine compartent.If all hoses are connected then you will have to check the heater blend door actuator and the heater blend door lever for proper operation.
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