Ice inside the windshield

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frapjap
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I've done some researching and reading, but nothing in the results really explains the issue I'm having.

Its winter here in New England and I park my Miata outside for the duration. Obviously a garage would be better, but that luxury isn't available. Snow is ALWAYS brushed off the car asap even though its parked. The car isn't driven and just hangs out, watching my old corolla catch the winter abuse.

A little background- the top is fairly new, it never leaks regardless of how much/how hard rain falls, and is adjusted pretty well. There is a slight bow in the center where it meets the windshield, but nothing awful that scoops air or anything of the sort. The first time I saw the windows ice from the inside, I thought "shoot, I need some damp rid." I did this, and while it works for most days, when the temp drops below 20, some condensation somewhere still forms on the windshield and ices up. The kind of icing you need an ice scraper for.

The heater core isn't leaking, the inside never fogs up when I'm driving and it rains, I don't drive the car much if at all in the winter so the argument about having ice or melted snow on the floor mats/floor pan isn't valid.

Is this just characteristic of leaving a convertible outside in the winter? The same thing (in the form of fogging) doesn't happen in the summer after rain and warm up/cool down events.

Any ideas? I'm stumped. :gotme


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Bubba1
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If your car gives you a choice between recirculated air or fresh air with your heater on, which many older Japanese cars do, chances are in the winter you have it on recirculate, thinking it'll warm the interior air more quickly. If it's on recirculate instead of fresh, try switching it to "fresh" because you're probably not removing the existing moisture from the cabin, which will eventually refreeze if it gets cold enough. It's happened to me a couple times, and my car was not convertible.

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frapjap
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Good suggestion and I hadn't thought of it. But 99% of the time its on fresh for the engine heat.

I may have not explained the icing problem well- the ice forms when the car is at rest, WAY before I consider driving it, and definitley not while I'm driving it.

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Ray you have been fooled yet again. Tita has been using your car late at night and then plastering your windshield.

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Bubba1
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snwbrdr435 wrote:Ray you have been fooled yet again. Tita has been using your car late at night and then plastering your windshield.
Are you suggesting Tita and Heavy were recreating the love scene from Titanic in Ray's car? I don;t want to think about what they do with the gear shift. :ohno:

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Bubba1
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frapjap wrote:Good suggestion and I hadn't thought of it. But 99% of the time its on fresh for the engine heat.

I may have not explained the icing problem well- the ice forms when the car is at rest, WAY before I consider driving it, and definitley not while I'm driving it.
With a fairly new top, it probably means the moisture stays in the car until the temperature drops low enough for it to freeze.

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frapjap
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Bubba1 wrote:
snwbrdr435 wrote:Ray you have been fooled yet again. Tita has been using your car late at night and then plastering your windshield.
Are you suggesting Tita and Heavy were recreating the love scene from Titanic in Ray's car? I don;t want to think about what they do with the gear shift. :ohno:
I'd be inclined to believe you, but the two of them wouldn't be able to find a sesual position to fit both of them in the car at once. Unless one of them hung out the window. But then the ice wouldn't be there. :chuckle:

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sx moneypit
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Bubba1 wrote:
snwbrdr435 wrote:Ray you have been fooled yet again. Tita has been using your car late at night and then plastering your windshield.
Are you suggesting Tita and Heavy were recreating the love scene from Titanic in Ray's car? I don;t want to think about what they do with the gear shift. :ohno:
:spitout:

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You might try checking the drainage tubes. Im not sure what they are for exactly, but I believe they drain water from the split between the top and the windshield. They exit out the rocker panels. They tend to clog and can cause excessive condesation on the windshield. Instead of draining, the water sits inside the rocker panels, which are open to the interior. Its worth a shot. I have even seen people go as far as drilling holes in the rockers and installing plugs that car be removed to occasionally drain moisture.

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frapjap
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I cleaned the drains before I parked it, but that doesn't mean that after it snows and the water melts, it won't freeze temporarily on the way out. Though the snow is gone, some of the drainage could have frozen over night. With some left in the tubes, it could theoretically be enough moisture to allow evaporation once it warms up again in the car to create the ice.

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frapjap wrote:I cleaned the drains before I parked it, but that doesn't mean that after it snows and the water melts, it won't freeze temporarily on the way out. Though the snow is gone, some of the drainage could have frozen over night. With some left in the tubes, it could theoretically be enough moisture to allow evaporation once it warms up again in the car to create the ice.
Could very well be.

I think it would be a far more common issue if 95% of Miata owners didnt store thier cars in a garage all winter long.

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frapjap
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EXACTLY! Even on the miata board there are answers like "why isn't it in the garage?" Hell if I know, why do you touch yourself at night?

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frapjap wrote:EXACTLY! Even on the miata board there are answers like "why isn't it in the garage?" Hell if I know, why do you touch yourself at night?
Why are you so fat? :chuckle:

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Jesda
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About a third of the time, my Saab's top is open in the winter. Its outside under the carport so snow cant fall on it. The interior is full of leaves by the end of fall.

It's basically a four-seat motorcycle to me.

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Jesda wrote:
It's basically a four-seat motorcycle to me.
Like. :bigthumb:

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Ray you might want to check the rear rain guard and make sure that it's sealed well with the body of the car. I know mine looked like it almost wanted to pop out in a few places after I did my top.

Also, as a quick and dirty experiment, you could try putting towels on top of your dash vents that point at the windshield just in case they are "breathing" moisture rich air in the cold. Block them off. If you still get the problem, you know that isn't it.

The fact that the ice is accumulating only on the windshield has me thinking it has something to do with that. Otherwise I would think it would go all over the other glass as well... right?

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frapjap
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PapaSmurf2k3 wrote:Ray you might want to check the rear rain guard and make sure that it's sealed well with the body of the car. I know mine looked like it almost wanted to pop out in a few places after I did my top.

Also, as a quick and dirty experiment, you could try putting towels on top of your dash vents that point at the windshield just in case they are "breathing" moisture rich air in the cold. Block them off. If you still get the problem, you know that isn't it.

The fact that the ice is accumulating only on the windshield has me thinking it has something to do with that. Otherwise I would think it would go all over the other glass as well... right?
Rain guard is clear and tight. But yes, there is ice on all of the windows, not just the windshield.

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sx moneypit
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:wtf2: Thats pretty f*** thick!

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Jesda
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JESUS CHRIST that's a lot worse than what I imagined.

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Jesda wrote:JESUS CHRIST that's a lot worse than what I imagined.
When my old corvair's windshield froze up on the inside, It pretty much stopped when I left both front windows cracked open a tiny bit for ventilation during the winter. Corvairs were not exactly coveted stolen cars so my risk was minimal back then. Is your neighborhood safe enough to try something like that?

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^ sort of half-assing the Jesda method of just leaving the top completely down hahaha.

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PapaSmurf2k3 wrote:^ sort of half-assing the Jesda method of just leaving the top completely down hahaha.
No, cracking the windows slightly doesn't ruin the interior.

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Dattebayo
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This happens to my Sentra all the time. Since I have a work car, it basically sits around all day.

But I have a leaky trunk because of the spoiler on the back...

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frapjap
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I'll try the cracking the windows option and wait for some results. The car is unlocked 99% of the time anyway. Its cheaper for a potential thief to open up the car and take a looksie for the non valuables than to have them cut the top.

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frapjap wrote:I'll try the cracking the windows option and wait for some results. The car is unlocked 99% of the time anyway. Its cheaper for a potential thief to open up the car and take a looksie for the non valuables than to have them cut the top.
Hah! You give thieves too much credit. My friend's clothtop Wrangler was left unlocked, but was still broken into by cutting the top. Even more stupid? Wrangler tops unzip from the outside, even if the truck IS locked.

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^ True. the thieves were just making it more fun like tearing open a xmas present instead of unwrapping it by the folds.

That is way worse than I imagined too. Ive never seen that before. Do you leave the heat on defrost all the time? Maybe when you turn the car off, water condensates alot more from a larger temp change on the windshield. :gotme

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Yeah, the inside moisture HAS to be coming from somewhere man. Pull up the floor mats and feel around your carpet for wetness (feel the floor mats too). Feel all around the top, even on the underside of the top itself.

Is your upper/lower shift boot torn? Not the leather one, but the rubber one going to the trans.

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That looks exactly like my friends Miata.

You have to have large amounts of moisture in the car somewhere. I would start looking under the carpet, or in the trunk. I have gone hunting for spare tires at work only to discover them completely submerged in water.

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MinisterofDOOM wrote: Even more stupid? Wrangler tops unzip from the outside, even if the truck IS locked.
:rotflmao

Get a hardtop Ray. Pretty much the best money you'll ever spend on a Miata.

Another thing to consider: How about the rubber seal at the top of the windshield's frame (where the soft top meets it)?

http://parts.arlingtonmazda.com/product ... 1B%29.html

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I believe I have found the solution:

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