Question regarding the Windsheld defrost

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  1. maguro

    maguro Well-Known Member

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    #1 Sep 15, 2018
    Last edited by a moderator: Nov 30, 2018
    Posted this question in General JL but it didn't get far so I thought I'd post my query here.

    It's pretty much winter up here in the Canadian Rockies and I had to use the windshield defrost for the first time this past week.

    vents.jpg

    When I use the windshield defrost, I get warm air coming out of the green area but no airflow at all from the red area. (Of course this picture omits the passenger side of the dashboard but it's the same thing on that side.)

    So the end result is that the center portion of the windshield becomes free of snow and ice but the edges remain frozen. What's up with that?

    Is it just mine? Can someone hit the windshield defrost on their center dash (top left corner) and tell me if they get any airflow from the vents towards the ends?
     
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  2. Grousemont

    Grousemont Well-Known Member

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    #2 Sep 15, 2018
    It seems your doing things right according to the owners manual.

    IMG_1345.PNG
     
  3. Gaxmode

    Gaxmode Well-Known Member

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    #3 Sep 15, 2018
    Funny. Mine alternates between hot and cold every few minutes when I turn the defroster on hot.
     
  4. OP
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    maguro

    maguro Well-Known Member

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    #4 Sep 15, 2018
    My JL warms up quickly and is blowing hot air in no time. But it never alternates between hot and cold.

    But as for my initial query, maybe it's a Jeep thing. I noticed someone even made a 3D printable diverter for his JK :
    https://www.thingiverse.com/thing:184101

    But the strange thing is that the JL seems to have the vents in place almost edge to edge. It's just that only the center vents seem to work.
     
  5. Jeepsterfreak

    Jeepsterfreak Well-Known Member

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    #5 Sep 15, 2018
    Does it only use the center vents on both windshield mode and mixed mode?

    You don’t have any air blowing on the ends of the windshield or the front door side windows?

    This will be a real safety concern in cold, icy, snowy climates.
     
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    maguro

    maguro Well-Known Member

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    #6 Sep 15, 2018
    vents.jpg

    Just to clarify, when in windshield or mixed mode, I don't feel any air coming out from the red area. The green area is fine. (The right side is not pictured but the same problem occurs on that side as well.)

    The side window have a separate vent and they work fine.

    Can anyone try this on their JL and let me know if this is the case on their Jeep?
     
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  7. jebjkey

    jebjkey Well-Known Member

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    #7 Sep 18, 2018
    Mine comes from the green area only
     
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    maguro

    maguro Well-Known Member

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    #8 Sep 18, 2018
    Thanks, jebjkey! I really appreciate that.

    I guess the red areas are just an accessory. Or maybe they're a feature which will be added in 2019.

    Either way, I'm sure we'll be seeing more of these threads as the rest of North America starts to get snow.
     
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  9. Jeepsterfreak

    Jeepsterfreak Well-Known Member

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    #9 Sep 18, 2018
    Does the red area blow warm air when the HVAC is set to the mixed position (windshield/floor) without using the windshield button?

    Also at various blower speeds?

    How about the side window vents on the dash? Anything coming out of those? I would think they are all connected.

    Just curious.
     
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    maguro

    maguro Well-Known Member

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    #10 Sep 18, 2018
    The mixed position does the same thing. No air from the red area regardless of speed.

    I'm thinking the red areas are not physically connected at all. Although I can't take a clear picture deep into the vent, there are changes to the structure at around that transition area.

    The side window vents are separate. They consist of smaller vents on the ends of the dash and they work fine to defrost the side windows.
     
  11. Jeepsterfreak

    Jeepsterfreak Well-Known Member

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    #11 Sep 18, 2018
    That does not seem like a safe design.

    How could that pass any regulatory safety test?
     
  12. jamielong

    jamielong Member

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    #12 Sep 19, 2018
    Mine is the same way , When the windshield fogs up and I have defrost on its only the center of the windshield that defogs ... mines going in next week ...
     
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  13. Rubiconnoisseur

    Rubiconnoisseur Well-Known Member

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    #13 Sep 19, 2018
    Mine blows cold air on 70 and hot air on 71
     
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  14. FWB FL

    FWB FL Well-Known Member

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    #14 Sep 19, 2018
    Mine are also the same, no air from the sides just coming from the center.
     
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  15. JEEPJL

    JEEPJL Well-Known Member

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    #15 Sep 19, 2018
    I know this was awhile ago but with the amount of stories I'm hearing I'm just wondering if this is related ???
     
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