Question about 2004 Ford F150

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Air conditioning blows through defrost vents only

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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.

Posted on Nov 22, 2009

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A/c blows through dash some time and defrost sometimes

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

  • 432 Answers

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.

Posted on Oct 06, 2009

jonathancole
  • 127 Answers

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

Posted on Aug 12, 2009

  • 74 Answers

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.

Posted on Sep 22, 2008

  • 20 Answers

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.

Posted on Feb 23, 2009

  • 1071 Answers

SOURCE: air conditioning stuck on vent

the mode door motor is bad

Posted on Aug 19, 2009

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2 Answers

1998 Dodge Stratus - Air conditioning is blowing through the defrost vents


Vacuum controls this circuit and leaks will cause blend air door to default to defrost. Check for bad check valve or hose leaks under hood first as these are the easy ones to get at and under hood heat causes deterioration.

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You have a vacuum under the hood that is broken,sucked together,or disconnected,it will be going into the firewall.

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its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

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When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

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