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Old 12-01-2011, 11:42 AM   #1
fullmonte OP
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Ice on the INSIDE of the windshield?

Went to my car this morning and there was a nice layer of ice on the inside of the windshield. 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. Any ideas on this interior frost intrusion?
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Old 12-01-2011, 11:43 AM   #2
anotherguy
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Leaking heater core and a dirty windshield.
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Old 12-01-2011, 11:56 AM   #3
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Someone who has obviously never driven an old VW Bug in winter
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Old 12-01-2011, 12:00 PM   #4
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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?

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Old 12-01-2011, 12:20 PM   #5
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Damp carpet will cause it, too.
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Old 12-01-2011, 12:25 PM   #6
the_gr8t_waldo
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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

the_gr8t_waldo screwed with this post 12-01-2011 at 03:23 PM
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Old 12-01-2011, 01:54 PM   #7
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Originally Posted by the_gr8t_waldo View Post
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 wet
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.
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Old 12-01-2011, 03:24 PM   #8
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damp carpet will cause it, too.
this.
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Old 12-01-2011, 03:34 PM   #9
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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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Old 12-01-2011, 04:22 PM   #10
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If equipped, make sure the recirculate mode is not activated. Had the same problem many years ago.
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.
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Old 12-01-2011, 04:23 PM   #11
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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.
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Old 12-01-2011, 04:40 PM   #12
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...a POS Chevette...

Redundant.

Just say'n
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Old 12-01-2011, 05:58 PM   #13
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...a POS Chevette back in the 70's...
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Originally Posted by rapidoxidationman View Post
Redundant.

Just say'n

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Old 12-01-2011, 06:13 PM   #14
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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.
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Old 12-01-2011, 08:50 PM   #15
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Originally Posted by rallybug View Post
Someone who has obviously never driven an old VW Bug in winter
+1. One hand the steering wheel, ice scraper in the other.
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