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Old 12-12-2013, 03:46 AM   #1 (permalink)
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Default Ice on inside of sunroof

It's been below freezing in DC at night and I park my car outside. I woke up yesterday to find frost on the inside of my windshield on the right side.

Today there was none on the windshield, but I checked the sunroof and saw frost/ice all around the edges on the inside. I am thinking it's a seal issue. Any thoughts? Take a look at the pic.
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Old 12-12-2013, 04:38 AM   #2 (permalink)
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you have moisture inside your car likely from the snow coming off of your boots/shoes.
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Old 12-12-2013, 05:07 AM   #3 (permalink)
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^^ likely. Its a well sealed car. Moisture vapor will accumulate like that.
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Old 12-12-2013, 05:10 AM   #4 (permalink)
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It's condensation. Parking in a warmer spot will cure it. Key West???
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Old 12-12-2013, 05:12 AM   #5 (permalink)
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No, don't think that's it. No snow on the ground here. And if it were moisture trapped in the car, why would it accumulate solely around the edges of the sunroof and not the center or along the side windows?
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Old 12-12-2013, 05:15 AM   #6 (permalink)
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Vapor rises?

Liquid phase --> turns to vapor, becames airborne --> Rises due to atmospheric pressure ---> Accumulates and freezes on sunroof.

Just my guess. I really dont think its a sunroof leak.
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Old 12-12-2013, 05:58 AM   #7 (permalink)
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I suspect it's just some condensation. The freezing makes it really stand out.

No harm cleaning it up though. Wet interiors encourage mould and that sucks.

Once everything melts, soak it up with a towel (don't store the wet towel in the car!). Get the floor mats and carpets dry as you can as well. Then, if the weather is warm enough, you can give the sunroof the "hose test" to look for leaks. Basically, give it a good (low pressure) soaking, and see if any water can get through.

I had some pretty serious condensation on my WRX sunroof this year. The inside of the glass was dripping with water. After cleaning everything up, all I did is crack the sunshade open a bit after parking the car (usually I close it). That allows for some airflow around the glass, and it seemed to help. The sunroof itself was not leaking.
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Old 12-12-2013, 08:32 AM   #8 (permalink)
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I get the same thing here in alaska. It's just the moisture in the car condensing on the sunroof and freezing in the cold temps. I've put a dry bag in the car to help trap the extra moisture and it seems to help out heaps. I used a shammy towel on the windshield and roof to soak up as much moisture as possible and the bag takes care of the rest.

Also I make sure the A/C is switched on to keep drying out the air coming into the car. Some foresters automatically make the A/C come on with the defroster.
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