AC blows where you have your control switch set,if it only comes out your defroster have the vacuum check at the blend air doors or if you have a faulty heater control unit.
A/c blows through dash some time and defrost sometimes
SOURCE: All Air Conditioning blows our the defrost vents
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
SOURCE: My 2002 Ford F-150 air conditioning only blows
air condtioning is controled by vacum it sould be a valve under the dash on the passanger side try moving them with the air on to see which one it is
SOURCE: Blower not blowing
the motor is bad, or there is a fuse blown. check all your fuses, if they are all good then replace the blower motor.
SOURCE: Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
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