The inside of your windows fogs up, especially in cool or humid weather. This is a humidity problem usually tied to the AC, cabin filter, or a coolant leak.
Find a ProviderWarm, humid cabin air condenses on cool glass. Running the AC (which dries the air) usually clears it; if it doesn't, something's keeping moisture inside.
Yes — a leaking heater core can fog the windshield with an oily film and a sweet smell, which needs repair rather than just defrosting.
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