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    jbajcm's Avatar
    jbajcm Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jun 27, 2010, 03:00 PM
    Air condition 1997 ford expedition malfunction during acceleration
    Why would the AC in my 1997 ford expedition change to defrost during acceleration and then back to AC once I let off the gas
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jun 27, 2010, 03:13 PM

    Try to perform EATC on-board diagnostics:

    https://www.askmehelpdesk.com/cars-t...ml#post1999642
    jsjmax's Avatar
    jsjmax Posts: 8, Reputation: -1
    New Member
    		  
    #3

    Jul 12, 2010, 05:51 AM
    The controls are operated on vaccumm, When you accelerate the vaccumm(sp)drops and the blend door starts to go back to the off position. When you let up the vac comes back and puts it where the control position is set. This can be considered normal.
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #4

    Jul 12, 2010, 08:10 AM

    You shouldn't have switching back and forth if all the vacuum lines are intact and the vacuum tank is holding proper vacuum.
    That tank is designed to provide sufficient vacuum during heavy throttle applications.
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