2012 530d Xenon Headlight fogging

Discussion in '5 Series' started by allanjenkins, Nov 22, 2019.

  1. allanjenkins
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    allanjenkins

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    Need some help/advice pls.
    As the title suggests my headlight has condensation inside with no obvious signs of a crack or hole.
    Wondering if there is a way to clear it, Hope I won't have to replace the unit?
    BMW have quoted £1200ish for a new one!!!!!!!!!!!!!!!!

    Allan.
     
    Last edited: Nov 22, 2019
  2. Carl W
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    Carl W Site Supporter

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    Welcome aboard Allan,

    I don't think this is any cause for concern. The lamp is vented so it should clear naturally.

    Kindest Regards
    Carl.
     
  3. Adie
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    Adie WARLORD Site Supporter

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  4. allanjenkins
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    allanjenkins

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    Thanks for the response Carl.
    Do you know how it's vented and from where. Could it be that the vent is blocked or maybe the vent is letting moisture into the unit.
    Just seems strange that it's started to occur now as I've had the car for many yrs.
    Thinking about my terminology and the word Fogging, it's perhaps more like small water globules present on the inner surface of the clear lens.
     
  5. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    Mine in the e60 fogged up, n/s was worst. She was due the MOT so just in case I removed the rear cover and played a hairdryer on the front of the unit. It took a wee while but they cleared eventually.

    I think mine was caused by my neighbour parking very close to the front of mine. When it's frosty the sun doesn't get high enough to shine on the unit, so it can't ventilate naturally. If I look closely at the light, there looks to be a vent at the bottom, on the 'inboard' corner of the unit - I'm not sure if that's the vent or not? :confusedmore:

    Are you in an e60 of F10?
     
  6. Carl W
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    Carl W Site Supporter

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    Sorry Allan,
    no longer have a f11 so can't be sure, it's just a guess but should be rear lower of the unit!
    Kindest Regards
    Carl.
     
  7. allanjenkins
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    allanjenkins

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    Thanks guys, I've ordered the silica gel blocks and I'll use the hairdryer method to give it a head start at drying out. Let's hope it resolves the issue.
     
  8. geffg
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    geffg

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    They are vented as I seen it on mine when I removed the headlight, it is on the bottom with a little wire gauze inside. Dried my headlight in the oven and sealed around the edge but lately mine has reappeared. I’ve left the top cap off for a while now and always have my headlights on, even daytime to allow it to heat up and vent out and up to now it’s been kept clear. Strangely enough it’s my near side that has the problem too. Just got to watch it doesn’t get too bad as on mine it started to throw errors as wet had gotten into the module but I sorted mine in time that I dried it out and it’s been ok. I’ve just ordered some of the silica beads to put in it. Also got some goretex repair patch that I’ve heard is good to drill a hole on the cap and cover with the patch so it’ll allow it to vent more and also waterproof.
     
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  9. xyzl
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    xyzl

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    • Informative Informative x 2
  10. allanjenkins
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    allanjenkins

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    Thanks again for all the info.
     
  11. allanjenkins
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    allanjenkins

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    OK I think I've resolved the issue! So far so good anyway.
    Removed the headlight before drying it out, that's after taking the front bumper off the car. Removed the seals.
    Shook the light unit to allow all the water globules form a small pool of water in the light unit. Manipulated the assembly such that the pool of water tracked the joint between the clear lense and body. Water escaped from one area of the joint at the top of the unit.
    Used a heat gun to dry out the unit, it took approx 3 hrs, then sealed the entire top end using a non setting sealant as used for caravan window/rooflight sealing.
    Tested the assembly by using a hose pipe
    It's been over a week now and all seems well.
     
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  12. Postman
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    Postman

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    I wish you lot would stop mentioning weird and wonderful faults!

    My car is obviously a hypochondriac .... owned for ten years now and never a sniff of condensation in the headlight lenses. That was of course before I read this little missal (n)
     
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  13. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    A hair dryer played from the outside proves just as effective. Takes longer but you don't need to remove the light then, of course. :) I think I posted in a thread recently, with pics and my write-up.
     

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