Question about 2003 Ford Expedition

2 Answers

Ok..here's the problem..for the past month when I put the AC on, regardless of it being on auto or just me choosing the fan speed, it will shift from the front vents to defrost vents by itself. it will continue to do this the whole time the ac is on.

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2 Answers

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  • Ford Master
  • 19,396 Answers

Hi.

It is either a vaccum leak or a defective PVHS (Vacumm Hub Solenoid). First test the vacuum using a gauge (Lisle 20300) in vacuum lines while heating the lines or spraying the lines with spray lube (Multi-Purpose lube).

After ensuring that there is no leak, go for the solenoid. The solenoid can be tested reading Ohms at its contacts and ensuring that there is continuity.

Vacuum leaks are most common cause for this problem.

See also this forum.

Posted on Jul 22, 2010

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  • Ford Master
  • 6,826 Answers

The logic of the door that controls defrost or vent is messed up either by a loose vacuum hose to a vacuum motor, or a bad vacuum motor.

Posted on Jul 22, 2010

  • Duane Wong
    Duane Wong Jul 22, 2010

    Panel Door
    To Remove:


    1. Remove Instrument Panel.





      Panel door vacuum control motor removal and installation




    2. Disconnect vacuum connector from panel door vacuum control motor.
    3. Remove panel door vacuum control motor screws.
    4. Rotate panel door vacuum control motor until it clears retaining arm.
    5. Remove panel door vacuum control motor.

    To Install:


    1. Install panel door vacuum control motor.
    2. Rotate panel door vacuum control motor until it clears retaining arm.
    3. Install panel door vacuum control motor screws.
    4. Connect vacuum connector to panel door vacuum control motor.
    5. Install Instrument Panel.

    Floor Defrost Door
    To Remove:






    Defrost door vacuum control motor removal and installation





    1. Disconnect vacuum connector from floor defrost door vacuum control motor.
    2. Remove floor defrost door vacuum control motor screws.
    3. Rotate floor defrost door vacuum control motor until it clears retaining arm.
    4. Remove floor defrost door vacuum control motor.

    To Install:


    1. Install floor defrost door vacuum control motor.
    2. Rotate floor defrost door vacuum control motor until it clears retaining arm.
    3. Install floor defrost door vacuum control motor screws.
    4. Connect vacuum connector to floor defrost door vacuum control motor.

    Air Inlet Door
    To Remove:


    1. Remove Instrument Panel.





      Air inlet vacuum control motor removal and installation




    2. Disconnect vacuum connector from air inlet door vacuum control motor.
    3. Remove air inlet door vacuum control motor screws.
    4. Remove air inlet door vacuum control motor.

    To Install:


    1. Install air inlet door vacuum control motor.
    2. Install air inlet door vacuum control motor screws.
    3. Connect vacuum connector to air inlet door vacuum control motor.
    4. Install Instrument Panel.


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