Ice on the INSIDE of the windshield?

Discussion in 'The Garage' started by fullmonte, Dec 1, 2011.

  1. fullmonte

    fullmonte Reformed Kneedragger

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    Went to my car this morning and there was a nice layer of ice on the inside of the windshield.:huh The first time, it happened a couple of weeks ago during our first frost, but I thought maybe it was a fluke. Guess not. So now it looks like I'll have to spray the glass with de-icer and wipe it with a towel for the entire winter. All the doors and windows were shut and so was the sunroof. The vehicle is a 2006 Honda CRV which I bought last April, after our last frost of the season.:lol3 Any ideas on this interior frost intrusion?:ear
    #1
  2. anotherguy

    anotherguy unsympathetic

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    Leaking heater core and a dirty windshield.
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  3. rallybug

    rallybug Local Yokel

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    Someone who has obviously never driven an old VW Bug in winter :lol3
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  4. disston

    disston ShadeTreeExpert

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    The AC system has to work for most, not all, cars window defrosters to work.The AC system "dries" the air that is then heated to defrost the windshield.

    You will have to spend some time getting your car ready to travel. In the old days we actually warmed the car up before driving away. Modern cars can be driven right away in most of the coldest weather but you still have to be able to see so maybe you have to wait for the defroster to work before driving away.

    I hope this helps. Is there really a problem I don't see?

    Charlie
    #4
  5. troidus

    troidus Long timer

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    Damp carpet will cause it, too.
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  6. the_gr8t_waldo

    the_gr8t_waldo Long timer

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    the defrosting opperation produces water, that's normally allowed to drain out of the car's defrost section. sometimes that drain gets clogged and that water, collects and evaporates and then re condensens on the windsheild right above the vents. from there, it freezes if conditions are right. if enought collects, you might start to find the the carpet is also starting to get wet
    #6
  7. fullmonte

    fullmonte Reformed Kneedragger

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    This makes sense. I've never had ice form on the inside of a windshield before, just the outside. Even my old 240Z with Flintstone floorboards didn't have this problem.
    #7
  8. concours

    concours WFO for 44 years

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    this.
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  9. mewapiti

    mewapiti Schlub

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    If equipped, make sure the recirculate mode is not activated. Had the same problem many years ago.
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  10. concours

    concours WFO for 44 years

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    Good point, in the interest of fuel economy sqeaking every last bit, some newest are cars default to recirc, even if you'd parked it in fresh air mode. Still others have dropped the icons, the "MAX A/C" label too.
    #10
  11. VStromTom

    VStromTom Long timer

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    I owned a POS Chevette back in the 70's. Damn thing frosted up on the inside of the windshield. Finally I pulled back the carpet and the floorboard was almost gone. That was the source of the frost/ice on the inside of the car. If this is a recent thing for your car, check the floorboard. It's either gone or you have a leak somewhere that allows water inside the car.
    #11
  12. rapidoxidationman

    rapidoxidationman Easily trainable

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    Redundant.

    Just say'n:lol3
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  13. Tosh Togo

    Tosh Togo Long timer

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    True, but some things deserve the double drubbing. :rofl


    Default A/C on is the only way to go.
    #13
  14. GreaseMonkey

    GreaseMonkey Preshrunk & Cottony

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    Can you describe where/how the ice has coated the windshield? Is it all over, or is it on the top half and the lower half is clear, or is the top clear and the ice is centered over the defroster ducts?

    How about the other windows- especially the back- are any of them frosted too?

    The good news is that it isn't your heater core, as that deposits a film that smears and is impossible to see clearly through and you definitely would have commented on that.

    Last question is do you have a sunroof? If so I'd look at the drain vents there first.
    #14
  15. Lee Dodge

    Lee Dodge Been here awhile

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    +1. One hand the steering wheel, ice scraper in the other. :lol3
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  16. squiffynimrod

    squiffynimrod maximum shrinkage

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    Happens all the time up here. Bring snow in on your boots, it melts and then evaporates via the heating system. Cold enough outside, you're scrapin' the inside. We get up earlier and hit the remote starter, she's clear by the time we head to work.
    #16
  17. mac10

    mac10 Adventurer

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    This is humid air condensing on your cold windshield, whatever the cause of the humidity. Try dumping the warm air in the car by leaving a door or two open for a minute when you park for the night. That way, there is nothing to condense as the vehicle cools, and the temperature is equalized between interior and exterior. The colder it is, the better this works.

    Reducing humid air left to cool,and sources of humidity, helps. In the snowy winter around here, using rubber mats prevents carpets from getting damp, and creating a source of humidity as the heater dries the constantly wet carpet all winter.
    #17
  18. Tosh Togo

    Tosh Togo Long timer

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    And a squeegee once you finally got above freezing. :eek1
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  19. kpt4321

    kpt4321 Long timer

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    It's a 2006 Honda, I think his floorboards are fine. :rofl
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  20. fullmonte

    fullmonte Reformed Kneedragger

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    After a looksee this morning, I've found that the ice coats the entire inside of the windshield when left outside overnight. It also covers the entire back hatch glass as well. The driver and left rear door windows also had ice around the perimeter. The inside of the sunroof was 1/3 covered in ice too. Last night after working out at the gym, I opened the door and all the windows were fogged up, badly. The car had been sitting in the parking lot for an hour at 58F in dry conditions. Something is blocked and trapping the humidity inside. How do you clean out the sunroof vents?:ear
    #20