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    ICEMAN537's Avatar
    ICEMAN537 Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Apr 27, 2009, 06:40 PM
    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
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Apr 27, 2009, 06:44 PM

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