Question about 2002 Ford F250 Super Duty SuperCab

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Ac vent stuck in defrost

I have a ford f250 and the ac vent is stuck in defrost mode.
how do i fix this problem?

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  • Anonymous Nov 11, 2008

    air flow only coming from defrost vent

  • Anonymous Jan 22, 2009

    Turns off in the off position but any other setting is sent out the defrost.

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  • Ford Master
  • 4,369 Answers

Find the vacuum leak in the engine compartment vacuum hose from engine to firewall, and vacuum reservoir for hole (in engine comaprtment or wheel well

Posted on Mar 06, 2009

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Posted on Jan 02, 2017

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1 Answer

Selector for air mode stuck on defrost


This is caused by a low engine vacuum, the engine vacuum is low when you accelerate, the HVAC system loses vacuum to the mode control vacuum switch and defaults to the defrost ducts for safety. You likely have a leaking mode control vacuum switch in the control panel of the heater AC system (HVAC).

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Temp blend door may be stuck. If it also will not go from defrost to AC the mode door may be bad also. Possible linkage or connection issue .

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MY 2005 FORD MUSTANG V-6 THE AC ONLY BLOWS THRU THE DEFROST VENTS ?


  • Do you hear any clicking noise form in the dash ? Sounds like the mode door actuator mite be bad or stuck or the HVAC control module isn't controlling it. The ford service repair information manual has a long drawn out test procedure PINPOINT TEST B: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S) You would have to take some of your dash apart to get at the wiring connectors on the back of the HVAC control module . You need a volt- ohm -meter to do some testing : first thing is to
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    Ac vent stuck in defrost mode . could this be a fuse problem


    Check vacum line, it may be crack or broken located on passager side under the hood closed to fire wall.

    Jul 23, 2010 | 2001 Ford F250 Super Duty Super Cab

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    A/C controler on Ford F-250 not working. A/C blows but to defrost only, nothing occurs when switching to vent control. Please advise. Thank You.


    No airflow at all or just not cold? The AC only runs in the AC , Max or either of the defrost modes to automatically dehumidify the air to reduce fogging. The other positions vent in outside (non conditioned) air.

    Jul 09, 2010 | 2001 Ford F250 Super Duty Super Cab

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    Only blowing through defrost vents


    defrost is fail safe mode. cehck for a broken vacuum line from the engine to the heater control head. check vacuum reservoir under hood for leaks.

    Oct 04, 2009 | 2004 Ford F250

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    Heater and air vents in dash hung in defrost mode


    Check the vacuum supply from the intake manifold.

    Jun 08, 2009 | 2002 Ford F250 Super Duty SuperCab

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