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Discussion Starter · #1 ·
Hello,

I am running into an issue where every time it gets cold outside, it seems that water starts to build up on the inside of the windshield. Only happens on the front windshield and none of the other windows.
This would make sense if it was raining and I had a clogged sunroof drain or something however this happens even when there is no rain. Looks like the previous owner has repaired the windshield so I’m thinking it could be a faulty install maybe. Have also seen talks of the heater core but the build up is not oily.

Anyone else encounter anything like this and have any pointers?

Vehicle is a 2012 CTSV Sedan with about 70k if that matters.
 

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2011 Black Wagon
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Do you park on a hill? Mine does this too with the factory windshield at 30k miles. I do live in Seattle so it’s always some shape of wet here…I do park on a hill as my driveway is steep fwiw.
 

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Discussion Starter · #3 ·
Do you park on a hill? Mine does this too with the factory windshield at 30k miles. I do live in Seattle so it’s always some shape of wet here…I do park on a hill as my driveway is steep fwiw.
I am in Sacramento, California and temps get to mid 30s at night but noticed this happens in any temperatures under like 55. Car is on a driveway, nothing super steep though and has happened while parked on a flat surface as well so I don’t think that’s the issue.
 

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Does it get worse when you turn on the front defrost? If so, then there is probably a pin-hole leak in the heater core.
 

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2013 CTS-V Wagon
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What floor mats do you use? Do you live in a winter/snow climate? If you do, pull your floor mats and lift-up your front driverside carpet, How much water is under it....

If there is water, invest in floor liners.....
 

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Discussion Starter · #7 ·
You might have the heater core going out.
I guess I’m a little confused on how the heater core would cause this issue.

Car hasn’t been turned on in a month (left sitting outside while on vacation) and the same issue persists.

What floor mats do you use? Do you live in a winter/snow climate? If you do, pull your floor mats and lift-up your front driverside carpet, How much water is under it....

If there is water, invest in floor liners.....
Not a heavy winter climate. Cold gets to a low of like mid 30s and no crazy rain per say. This happens even when it does not rain. I have yet to find noticeable water spots but also have not pulled the mats yet tbh
 

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2011 Black Wagon
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Ten year old car syndrome. Your door seals, sun roof seals, grommets, seam sealer, all that is shrinking thereby letting moisture in at the path of least resistance. Sad to say, but cars get old too. Say, didn’t you folks just get a lot of rain recently? Try a portable dehumidifier and pull your mats out for a couple of days and see if that helps.
 

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Hello,

I am running into an issue where every time it gets cold outside, it seems that water starts to build up on the inside of the windshield. Only happens on the front windshield and none of the other windows.
This would make sense if it was raining and I had a clogged sunroof drain or something however this happens even when there is no rain. Looks like the previous owner has repaired the windshield so I’m thinking it could be a faulty install maybe. Have also seen talks of the heater core but the build up is not oily.

Anyone else encounter anything like this and have any pointers?

Vehicle is a 2012 CTSV Sedan with about 70k if that matters.
Heater cores typically do this when they go out.
 

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2014 6M, Recaros, Slicktop, Stock
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My last V2 did the same thing but my current sunroof delete V2 does not. I'd check the sunroof drains because the corrosion behind my center stack indicated mine was leaking long before the puddle appeared on the floor.
 

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The humidity in the car is significantly higher than your outside humidity. The cool air outside condenses the water vapor on to the windshield because of the angle of the glass, compared to the other glass. Just had this happen to my Outlook, parked nose down, warm humid day, parked all day with all doors open, then quick cold snap over night. Gobs of moisture inside windshield, could not see out. No other windows fogged. I went to scrape the windshield thought it was frost. You may have a significant amount of moisture in your vehicle that is being replenished. Not your heater, but could be a plugged evaporator drain, all that water from ac can collect in ductwork, could take weeks to evaporate out. Or a body leak, your carpets soaked. Leaving windows cracked or vehicle open during day should help. Run the heat for a while with the windows open. You need to lower the RH in the vehicle to make it stop.
 
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