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Misty windscreen

Discussion in 'A3/S3/Sportback (8P Chassis)' started by tally2425, Oct 23, 2013.

  1. tally2425
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    tally2425 Member

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    Well last night it was raining and was fairly cold outside and it was a pain in the arse to keep the windscreen from steaming up inside with the ECON on and auto set to 23c, before we jump to the conclusion that it's the heater matrix i just want to eliminate other things that it could be.

    Here's a little information on the matter

    i basically live under trees and leaves are starting to fall off the trees could something be blocked?

    Secondly drove to work this morning on normal temp 23c on auto and it was NOT steaming up

    Thirdly there's a slight musty smell when i put the heat on so it's making me think something is blocked?

    there doesn't seem to be a leak in coolant.

    it's not a major problem as i can demist the car with the button to demist the front windscreen but just want to try solve the problem!

    Thanks
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  2. LEE69
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    LEE69 07 170 DSG

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    Pollen filter blocked?
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  3. tally2425
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    tally2425 Member

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    Where is this and how do i change it?
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  4. nluk100
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    nluk100 Active Member

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  5. LEE69
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    LEE69 07 170 DSG

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    Right under the under the glovebox

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  6. tally2425
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    tally2425 Member

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    This makes me feel better! haha, i shall do that and see how things go!

    Thanks i shall get a new pollen filter too as it's done 90k and it's definitely worth a change! what's the best i can buy to replace it?
    Last edited: Oct 23, 2013
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  7. tally2425
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    tally2425 Member

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  8. veeeight
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    veeeight Well-Known Member

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    1. Change your pollen filter - this will improve things, especially if its old.

    2. Check for blockages of the inlet air vents, and the outlet (waffle).

    3. With humid outside air (eg: its raining outside) - and if you have ECON on (or AC off) - the humid outside air will condense on the windscreen - and mist up. That will always happen due to the dew point. The only way around this is to utilise full AUTO, or switch ECON off, or switch AC on.

    Same effect why you get condensation on the outside of a cold glass on a warm day. Switching on the AC or switching off ECON will de-humidify the air, changing the moisture content and dew point, and your screen will no longer mist up.
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    phil76 and tally2425 like this.
  9. tally2425
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    tally2425 Member

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    I'm definitely changing the pollen filter so that's all good. Thanks for the explanation makes me feel 100x better! :D
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  10. veeeight
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    veeeight Well-Known Member

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    The slight musty smell is probably due to 2 things - a manky pollen filter, and an aircon evaporator coil that has gone slightly musty/mouldy.

    The aircon evaporator coil is in the same area as the pollen filter (under/behind the glovebox) - when the aircon is working, it is extracting all the moisture from the incoming air, and all this moisture/water needs to go somewhere. So there is a drain tube from the evaporator, to the outside of the car (underneath the car) - this sometimes gets blocked, so its worth getting underneath to find this to poke it out with a stick.

    In the hot weather, you can tell if the drain tube is clear, when you return to your car after being parked up (having previously driven with AC on) - and you find a puddle of water under your car. This water is from the evaporator coil.

    So - check that your drain tube is clear, and you can buy antibacterial and anti fungal sprays to clean your evaporator coil out, if you think that is the problem.

    But just start with the pollen filter and see how you go.
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  11. tally2425
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    tally2425 Member

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    I'll have a look for this aswell, i may aswell check everything whilst i'm working on it! also any ideas what pollen filter i need for my car there seems to be 8P1 and 8PA which is two different types my car and the pollen filters differ and not sure which type i need, my car is Audi A3 2.0 FSI (2004/2005)
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  12. veeeight
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    veeeight Well-Known Member

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    Take your old pollen filter out to check part numbers.

    5 mins grovelling about in the passenger footwell.

    You can drive without the filter for a couple of days, but put the cover back.
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  13. fangio
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    fangio Well-Known Member

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    Do you have climate control? If so, just press the de-mist button, looks like a little windscreen, to the left on the bottom row of buttons.
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  14. tally2425
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    tally2425 Member

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    i do indeed and when i press it, it goes away but after a few moments it's back again
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  15. fangio
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    fangio Well-Known Member

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    Something needs looking at!

    Your carpets aren't damp, are they? :think:

    Some cars get water inside when the drains in the bulkhead get blocked with leaves,
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  16. tally2425
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    tally2425 Member

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    Nope no leak at all, i'm just coming to think that's it's condensation as i had it on auto on 23c and it was more like 9c outside so most probably nothing but changing the pollen filter and unblock my drains and see how thinks go!
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  17. tally2425
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    tally2425 Member

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    Changed the pollen filter, was fairly dirty check the photo out!

    Attached Files:

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  18. LEE69
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    LEE69 07 170 DSG

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    Yeah was well past it's due date
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