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2003 A4 windshield fogging

Discussion in 'A4/S4 forum(B5 Chassis)' started by jimpturner, Oct 9, 2003.

  1. jimpturner
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    jimpturner New Member

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    Does anyone know a fix for this problem. Whenever the humidity is high (almost all summer around here) the windshield over the defrost vents fogs up on the outside. If it's very humid, almost the entire windshield get covered. I have been unable to stop this by setting the HVAC controls. The only 2 things that stop it are: turn off the A/C; or set the temp above the ambient outside temp. Neither are good solutions. Almost all A4s in this area do it but the local dealer (Roanoke, VA) said mine was the 1st complaint and he was unaware of a fix. <font color="green"> </font> <font color="green"> </font>
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  2. excursion
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    excursion Member

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    The only thing I can think of is to place some kind of diffuser over the windscreen demister vent.
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  3. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    Sounds like you need to regas the climate control, or get the dryer cleaned out (you may have a leak). Climate control takes out the humidity in the car, so if it's working ok you never get fogging. I had a leak on my system and when it got low on gas the windscreen would fog up regardless of the weather. Don't go to Audi to get this sorted they know absolutely nothing about A/C. Find an A/C service centre and get the system serviced. Apparently you're supposed to get the aircon serviced every 12 months, to avoid expensive repairs. My system repair was £600, which was half the price of an Audi dealer, despite the components being identical.
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  4. anwar
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    anwar Member

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    hi mate if it is steaming, then you have a water leak somewhere.
    Check the passenger and driver footwells for damp.
    Make sure they are dry.
    Water may be coming from a broken door seal, or your heater matrix might be leakig (behind dash).
    If it is your water matrix, your coolant level wil have dropped - check that to prove your matrix is OK.
    Check rear footwells too.if its that then its expensive let me know then i can tell you how to sort it out with out paying too much money. good luck /ubbthreads/images/graemlins/beerchug.gif

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  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    If the climate control was working properly it would clear the moisture from any footwell dampness. It's definately the climate control.
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  6. excursion
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    excursion Member

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    Guys you've read this wrong, it's on the OUTSIDE. Caused by the high humidy in the outside air (as Jim stated) and the windscreen being so cold /ubbthreads/images/graemlins/wink.gif
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  7. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    I've heard that there are devices called windscreen wipers that can cure this problem, I think they're standard on all A4's.
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  8. excursion
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    excursion Member

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    No they don't unfortunately, not in bad cases.
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