Question about 1998 Volvo V70

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Well when I turn on the heat the windshield fogs up due to fumes/smoke coming out of the vents.

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Seems like you've got some damp in there.

1) Check that the run off's are not blocked. These are the pipes that allow water to run off the front screen and the plastic below it. Under the bonnet / hood.
2) Could be damp in the cabin pollen filter. Clean out the housing, check the seals and replace the filter.
3) Check that the carpets are not damp - could be hole in the bodywork cause by rock or some such.
4) If it is an estate car / station wagon, in the back behind the seats, near where the seat belts go in, there is a "vent" at each side. Behind the plastic slotted cover is a block of foam rubber. Check these are dry.
5) Try clean the windscreen / windshield with a solvent based cleaner. Then use a product such as FogX

Posted on Oct 22, 2009

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Most like its the heater core

Posted on Oct 02, 2009

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An easy fix and one to try first is turning the temperature gauge over toward heat, and setting the directional controls to defrost. Up the power on the blower for a moment. The warmer air will usually clear up a foggy windshield in seconds on a chilly or even not-so-chilly morning. The condensation on the glass needs a change of temp in order to evaporate. Sometimes you can get the same effect by using outside air to circulate through your car's blower system. Most have a way of circulating either inside-car air, or outside-car air.

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Of course, if you're trying to wipe this fog clean and it won't go away, maybe you've got someone smoking in the car and leaving a film on the glass. It would take a lot of smoking to make the windshield look foggy though.
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