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There may be a leak in your heater core inside of the care. This would cause moisture to be blown up onto the windshield.
Take the car to a mechanic to verify this.
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Is the heater control in the defrost position? Most cars will automatically turn the air conditioning compressor on when defrost is selected to dehumidify the air being directed on the windshield. This keeps the windshield from fogging up, and helps defog the windshield more quickly if it is already fogged up.
Assuming that it is working in frigid conditions, sometimes The
Ac works with the defroster to remove moisture and the fog on the inside windshield. So, turn the defroster of unless you need it when the windshield fogs. You may be able to keep the window clear by opening the outside air vent and increasing the heater temperature.
May I assume you've tried the 'defrost' setting? Front or rear windshield? I'd be looking at control to turn on 'defrost'. As for the in/out, there's an inlet and outlet hose to the core.
It is normal for the A/C compressor to come on during defrost mode. This is done to prevent provide dry air to the windshield to prevent fogging when the defroster is turned on. The blend door is designed to allow heat to the windshield, but also some of the cool air from the evaporator to prevent fogging.
There is too much moisture inside the cabin. Either something is leaking water into the car, or your fresh air setting is not working on the hvac system. You can not run the system on recirculate and get rid of the moisture.
temporary solution is to goto walmart automotive section and look for rainX anti fog wipes. and if you change you control knob to a different zone do you get heat and does it go from vent to floor
Was there a smell along with it fogging up the window like antifreeze? If it did the heater core is leaking and needs to be replaced. It will be kind of a sweet smell.
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