Moisture on the internal windscreen when air conditioning is on?

When driving in the winter I normally turn on the air conditioning. But this caused a problem: there is moisture on the internal windscreen which can blur my view. I have to use a mop to manually clear the internal windscreen window. Is there a way to deal with this, without having to use a mop manually?

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  • 8 years ago
    Favourite answer

    There is usually a setting for defrost, use this setting if you are getting moisture build up inside.

  • sobus
    Lv 4
    4 years ago

    you're patently not utilising the air con wisely, ac quite dries the air that is why in some vehicles it comes on immediately once you place the air to the exhibit screen. you need to use ac constantly, even while heat air is needed, in case you do not the air pipes gets damp, you get a scent like cat wee and the misting up turns into worse. you additionally could have the recirculation on which lower back will make the damp worse as you're only recirculating heat damp air, be certain you turn this off, it is going to purely be used while in site visitors or an extremely warm day. If used while very heat you would be recirculating cool air so the ac may be became down somewhat.

  • 8 years ago

    Are you sure that this is just plain moister? Or does it smell like coolant? Sweet and kinda sticky to the touch. If so, you have a leak in your heater core. If it is just moisture, try looking under the hood back by the bottom of the windshield and check to see if there is any kind of leaves or dirt and debris on top of those plastic screens that cover up the air intake for your defrosters. If those are blocked or plugged in anyway, your defrosters won't work very well at all.

    Source(s): 38 years in the automotive repair buisiness
  • 8 years ago

    First thing to do is remove the cabin air filter and check that it isn't wet for some reason or clogged. Also check for any moisture in the air ducting.

    You're sure you've got the ventilation set to fresh air rather than recirculate?

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  • Neil B
    Lv 7
    8 years ago

    If you're getting moisture with the A/C on then it's not working properly, though bear in mind it's neither instant in terms of getting to work as soon as you start the engine (needs time to build the pressure in the system), nor is it instant in terms of clearing accumulated moisture.

  • 8 years ago

    If the heater core is good and dont leak , You need to get someone to look at the a/c system it runs in the wenter time and that is what removes the moisture off the windoes .

    Source(s): drpeppers
  • 8 years ago

    Just the opposite of what should happen: in a normal system,the AC kompressor is on except in coldest temps, it dehumidifies the air entering the system which is then heated by the heater core and distributed to interior. The entire point of the kompressor running is to dehumidify and prevent fogging.

    If the kompressor is working correctly, I would suspect that the evaporator drain (which collects moisture from the cooling coils and drains it to the ground) is clogged . . . . this drain is usually a plastic tube from the cooling box under the dash panel . . . best it be disconnected under the dash and blown out with air from a high volume air kompressor at your shop or dealership.

  • Anonymous
    8 years ago

    Simple-- turn the Heat Knob clockwise to put heat into

    the AC for the best moisture removal.

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