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Wisconsin | you don't say where you are, or what conditions it's fogging up. AC with defrost is for mild humid climates. If the outside temp is much below freezing, there is so little moisture in the air that AC is not doing anything. Heat on high, fan on high and all fresh air will dry it out best. If that's not working, your heater core or air filter is blocked with dust and chaff, the thermostat is opening too soon, or the heater core is leaking if you smell sweetness from the vents.
Edited by junk fun 12/24/2020 21:16
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Cab windows fogging
