Condensation on exterior front windscreen

  1. chiggah

    chiggah Member

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    Does anyone get condensation on the outer windscreen ? Usually happens after rain but not every time. I read this is due to the humidity difference between inside and outside. Wipers is the only way to clear it up, but keeps coming back after a minute or so.

    I took to Service Centre and they admitted was a fault in the part. Repaired the following:

    - Replaced front servo motor

    - Replaced heater sub assembly

    As today's weather was raining and humid, I noticed this condensation again. Turned on the front/rear demister and it seems to make the condensation worse.

    This only happens on the front windscreen mainly. Rear was OK, but rear side, there is some slight condensation. Images attached

    However, weird thing is, I did not have this yesterday even if it rained.

    Any idea what is going on here ?

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  2. calonzo

    calonzo Senior Member

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    Is your car garaged, and if so, is your house air conditioned? If you are going from a cool, dry garage to a warm humid climate, this could happen.

    I doubt any part on the car would cause condensation on the exterior, only on the interior if there was a leak in the heater core.
     
  3. OP
    chiggah

    chiggah Member

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    Thanks for the reply !

    No, this was after work, and was not garaged. Parked outdoors in the lobby

    But if you think this should be normal, then I will let it be.

    Just a safety hazard that I can't really see anything, and only having to use my wipers to clear.

    My inside temps are around 20-22 degrees
     
  4. calonzo

    calonzo Senior Member

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    It definitely is a safety hazard.

    Do you mean you keep the AC in the car at 20-22? Is cold air blowing on the windshield? That could cause it, also. Normally, it should not blow on the windshield. Maybe that is what the dealer was trying to fix?
     
  5. OP
    chiggah

    chiggah Member

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    #5 chiggah, Aug 15, 2019
    Last edited: Aug 15, 2019
    Yes, I keep the AC in car around 20-22.

    I am not exactly familiar of the nitty gritty but yes that sounds about right, hence the servo arm replacement

    One of the servo arm "flaps" was not opening/closing properly, so it was blowing cold air to the windscreen

    I may just have to take it back to the dealer, but just worried if it is something more, and if they can't resolve it.
     
  6. NotSerious

    NotSerious Senior Member

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    The aircon turns on when you set the climate control to "defrost windshield". Aircon is a dehumidifier that reduces humidity in the car and clears the windows of moisture. If you are not setting your climate control to "defrost windshield" or your aircon system is not working you would get moisture all over your windows. Aircon system failures are common on tenth generation Civics.
     
  7. OP
    chiggah

    chiggah Member

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    When you say "get moisture all over your windows", did you mean either internal or external ?

    My condensation is on the external
     
  8. Zodd

    Zodd Senior Member

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    had similar front screen with some wax car shampo... try cleaning ur windshield with alcohol maybe ?
     
  9. NotSerious

    NotSerious Senior Member

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    #9 NotSerious, Aug 15, 2019
    Last edited: Aug 15, 2019
    - Check that your aircon system is working (Does it blow very cold air out of the vents ?).
    - If your aircon works properly, the next time you get condensation, turn on the "windshield defrost".

    See if that works.
    External condensation should be cleaned off by your wipers. Try using polish or wax on the outside of your windscreen if it doesn't.
     
  10. OP
    chiggah

    chiggah Member

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    #10 chiggah, Aug 16, 2019
    Last edited: Aug 16, 2019

    Just checked, at max AC fan, no cold air is directed from the vents to the windscreen

    Will try the "windshield defrost" next time. I tried last night, and it seemed to have made it worse
     
  11. shoegazer

    shoegazer assistant to the assistant manager

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    We live with this in North Carolina.

    If I understand the issue correctly; this condensation will generally happen when the glass is at a temperature at or below the dew point. I also notice it after a period of rain. And it fogs back up immediately after the wipers clear it away.

    In those situations; I run the heat in the defrost mode in an effort to increase the temp of the glass. I'll run it, along with the ac compressor, as warm as I can tolerate.

    I notice it in particular after I return to my car in a parking lot on a very humid evening.

    I'm told it's the same thing as when a glass of cold liquid sweats on a humid day. A cup of (hot) coffee wouldn't do this.

    Rain-X helps a bit (for me). But the key is warming the glass.
     
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  12. OP
    chiggah

    chiggah Member

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    Thanks I will give the heating part a try next time it happens.This doesn't occur on a daily basis, nor after every rain session, so I can still bear with it.

    Would my tinting play a part of the condensation factor too, since it negates/deflect heat ?
     
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  13. latole

    latole Civic Lx 2018 Manual , Civic LX 2016 Manual

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    It is normal. It is about weather outside and inside the car
     
  14. krees

    krees Senior Member

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    This guy nailed it.
     
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  15. shoegazer

    shoegazer assistant to the assistant manager

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    #15 shoegazer, Aug 16, 2019
    Last edited: Aug 17, 2019
    I doubt it. As mentioned above... it's about really, really high humidity levels (which raise the dewpoint temp). In these extreme conditions; my (air-conditioned) home's windows will do the same thing.
     
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