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It just means that the air is too humid and it is condensing on the windshield. That's the reason they auto manufacturers make so many choices on the air handling. ANSWER the heater core could also be bad

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โˆ™ 2009-03-12 05:05:16
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Q: What could be the problem on a 2000 VW Jetta when using the inside air the windows fog over?
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