Question about 2007 Ford F-150 Harley Davidson

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Ac on 2003 f150 supercrew blows air out defroster when on max

Works fine until switched to max ac then blows through the defroster vents

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  • Anonymous Mar 14, 2014

    2003 F150 supercrew cab blower res located

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  • Master
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Check for vacuum leak going to air inlet door. Should be a white vacuum hose.

Posted on Jun 22, 2009

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1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

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what it seems like is that your front blower may be bad or went out or there is a short in one of the functions

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Ac blows through defroster on max


The Climate control system in your truck has a gate that changes postition in order to change the flow of air from your face to defrost. The door is actuated by vacuum. Yours is still working otherwise it would be on defrost all the time. So you do have partial vacuum to the actuator but not enough to keep it in position when on high. Sounds like you have a vacuum leak but not bad enough (yet) to totally disable the gate.

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Why does the ac on my 2003 ford f150 blow through the defroster


Most likely it is a vacuum problem. That's what controls the air flow flaps.

Jun 21, 2009 | 2003 Ford F150 Regular Cab

1 Answer

1997 explorer max ac switches between front and defroster vents


Check the vacuum hose going to the heater control valve,it may have popped off. If that is on. check the vacuum hose going to your recirculation door under the right side of your dash. I hope this helps.

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Ford F150 2003 When I press the max cool on the AC the air comes out of the windshield defrost vent iinstead of the cabin vents and is not as cold as it use to be. Summer in Texas Help !


You did not mention if the system you have is electronic(digital control) or manual(control knobs) but what your problem is, is a vacuum leak. Defrost and heat or the default postions for no vacuum. If it works ok until you press max air Then you will need to check the outside blend door vacuum motor. It will be the white vacuum line going from the control head.
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Hot air coming out of vent when air is on.


put some frion in and change out the antifreeze

Apr 19, 2009 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Heater stopped blowing in all settings, except defrost.


Here's a link that may shine some light on it for you. I'd probably try to get to the spot where electrical connections are first, and try removing it, cleaning all contacts etc, & re-try.

http://www.autozone.com/addVehicleId,2722704/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152801df452

Dec 10, 2008 | 2001 Ford F150 Styleside SuperCrew

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AC is supposed to run in defrost position It should not run in heat position.

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1 Answer

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its probably a stuck servo motor on the vent positioning if its automated but if its cable type, maybe the cable is loose.

Aug 14, 2008 | 2001 Ford F150 Styleside SuperCrew

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