Question about 1994 Mercedes-Benz C-Class

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Fog problems inside windows,most with 3-4 persons in car.No A/C Have tried all positions on vent.And heat. c 180 1994

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  • Alex Jarema
    Alex Jarema May 11, 2010

    Easy with the shop. First of all try to change the pollen filter and then see if the moisture is still coming up on the windows.

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Your de fogger uses the A/C system to work properly. You will need to find someone to repair the ac system. check your local autoparts store to find a reliable mechanic if you don't have one.

Posted on Jan 10, 2009

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If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.

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1 Answer

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Does the air smell like antifreeze? If so your heater core could be leaking. If it doesn't then it sounds like somehow moisture got down into the vents so moisture is heated and blown up causing the windows to fog up.

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