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Thread: Water, condensation or misted Fog Lights (Foglight)

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    Default Water, condensation or misted Fog Lights (Foglight)

    My theory is that the foglights have a vent on the back, which lets in water, particularly the N/S/F foglight on my facelift Signum 2.2. The vent is about the size of a 10 pence coin, and is on the back face of the housing.

    What I have done is sealed up the vent - I squirted some sealant (silicone rubber) into the groove around the edge of the vent. I then got some windscreen washer tubing, and drilled a hole through the inside face of the foglight housing to accept the tubing - watch where you drill. Run the tubing high up into the engine bay, tie wrap in place. Align the open end of the tube so that it is facing the windscreen. Seal around where the tube enters the foglight housing.

    Be aware that the housing is made of polypropylene, which is difficult to glue or seal. Loctite do a special primer - I think it is Loctite 770 - for Polypropylene if you want to glue a boss onto the housing for the tube. Otherwise don't disturb any sealant bead once it has set.

    I did this mod last Autumn and have not had a problem since ...

    (Keywords - misting, foglight, foglamp, condensation, water in Foglight)

  2. #2
    Regular Member TimTay's Avatar
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    I was told by someone on here that the NSF misted foglight is a sign you have been over filling the water bottle. And it leeks round the seal onto the light.

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Why didn't you just fit the proper snorkel kit, or put some dessicant (moisture absorber / silica gel) in the base of the inspection cap?

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    Regular Member TimTay's Avatar
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    Would get away with dry rice stuffed in a empty teabag aswell worked for me

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    The seal on the washer bottle is fine - and not over filled.

    The O/S/F vent is better protected from the elements as the Power Steering unit acts as a shield for the vent.

    Silica gel needs regenerating after it becomes fully saturated.

    Each to their own solution.

    PS - at one time there was 1 cm of water in the base of my Foglight. A relative has a 2006 Saab - that too accumulated water in the foglight during very heavy rain.
    Last edited by omega2498; 12th May 2011 at 00:49.

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    Full Member Big Sig's Avatar
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    I just used to leave the cover off altogether!
    Now I need a turbo to keep up!

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    Vehicle : Vauxhall Astra-J

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    Year : 2013

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    Quote Originally Posted by omega2498 View Post
    Silica gel needs regenerating after it becomes fully saturated.
    Change mine once a year. Takes me less than 2 mins to change. Don't even break out in a sweat doing it.

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    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

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    Quote Originally Posted by Big Sig View Post
    I just used to leave the cover off altogether!
    Me too, but I replaced it when the foglamp cleared. Then I drilled a hole in it and plugged the hole with a plastic bung, so I could just remove the bung to aerate the enclosure without removing the cover.

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