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ACC never turns on lower vent/front defrost mode automatically

Discussion in 'Gen 2 Prius Main Forum' started by lorkp, Jan 20, 2007.

  1. lorkp

    lorkp New Member

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    Our previous car would sense by outside temp when the windshield would likely fog up and select the climate mode with the lower vents and windsheild defrost icon automatically (when in AUTO mode). However, I've never seen my Prius do this.

    When I want to defog the windshield, the defrost mode is too much—it immediately clears, but then creeps back on. I'd keep it in this mode all of the time, but it's not automatic, and the noise is annoying. Instead, I have to manually select the lower vent defrost icon, and this keeps the fog at bay without going all out. However, I feel that this should be automatic.

    Has any one else noticed this, or know why the car acts this way?
     
    #1 lorkp, Jan 20, 2007
  2. seasalsa

    seasalsa Active Member

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    <div class='quotetop'>QUOTE(lorkp @ Jan 20 2007, 12:54 AM) [snapback]378190[/snapback]</div>
    The windshield will not fog up if you select Auto AC and set the desired temp.
     
    #2 seasalsa, Jan 20, 2007
  3. SomervillePrius

    SomervillePrius New Member

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    <div class='quotetop'>QUOTE(seasalsa @ Jan 20 2007, 08:57 AM) [snapback]378214[/snapback]</div>
    I agree if you keep it at automatic it keeps the windows surprisingly defogged without "officially" pushing air to the windows (I suspect the Prius always runs a little air towards the windows). For awhile I was trying to out think the Prius and I didn't use the automatic switch, this would make my windows fog up.

    So the easiest is to allow the Prius to do it's job in automatic (I have mine set at 65F).
    I run front defroster (and rear window heat) in the morning for like 2-3 minutes if needed, then I switch to automatic

    /Robert
     
    #3 SomervillePrius, Jan 20, 2007
  4. KMO

    KMO Senior Member

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    Mine does select lower+defrost automatically sometimes, but not often.
     
    #4 KMO, Jan 20, 2007
  5. Tideland Prius

    Tideland Prius Moderator of the North
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    <div class='quotetop'>QUOTE(lorkp @ Jan 20 2007, 12:54 AM) [snapback]378190[/snapback]</div>
    I've seen it happen once or twice in the 5 years we've owned our 02 Camry. I've yet to see/feel it in the Prius.
     
    #5 Tideland Prius, Jan 20, 2007
  6. PA

    PA Member

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    <div class='quotetop'>QUOTE(lorkp @ Jan 20 2007, 03:54 AM) [snapback]378190[/snapback]</div>
    So which exactly are the "lower" vents? Floor? Dash? Windshield? I'm having trouble figuring out what exactly is the problem you're describing.
     
    #6 PA, Jan 20, 2007
  7. Tideland Prius

    Tideland Prius Moderator of the North
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    <div class='quotetop'>QUOTE(PA @ Jan 20 2007, 10:29 AM) [snapback]378303[/snapback]</div>
    "Foot/Defrost"

    the one between "Foot" only and " Front Defrost"
     
    #7 Tideland Prius, Jan 20, 2007
  8. lorkp

    lorkp New Member

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    In general, I do keep my system on automatic. On a recent road trip, the windshield fogged even though the system was set to automatic (with a temperature of 70 F).
     
    #8 lorkp, Jan 20, 2007
  9. meezercat

    meezercat New Member

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    Mine does select that mode when in automatic. I've noticed it there several times in the past few days.
     
    #9 meezercat, Jan 22, 2007
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