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-   -   Air flow (https://www.askmehelpdesk.com/showthread.php?t=346929)

  • Apr 27, 2009, 06:40 PM
    ICEMAN537
    Air flow
    I have a F150 truck ,lately when I have the AC on and press on the gas petal--
    The air goes from the front vents to the defrost vents, let off the gas and it goes back to
    The front vents?

    Is it a vacumn problem or the air select switch problem?

    Iceman537
  • Apr 27, 2009, 06:44 PM
    TxGreaseMonkey

    Vacuum pressure drops, as the throttle plate opens. Pressure drops are affecting the blend doors.

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