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From Consumer Reports
Q. How can I keep my car windshield and windows from fogging up in the winter?
A. Car windows can quickly steam up in winter when moisture in the warm cabin air creates condensation.
To clear a foggy car windshield and/or windows, make sure your climate control system is in fresh-air mode (running it in recirculation mode will cause moisture to accumulate). And although it might seem counterintuitive, you should turn your car's air conditioner on. The compressor dehumidifies the air, which will reduce the chances of a foggy car windshield. Plus setting it to a high temperature should keep the car toasty, too.
Q. How can I keep my car windshield and windows from fogging up in the winter?
A. Car windows can quickly steam up in winter when moisture in the warm cabin air creates condensation.
To clear a foggy car windshield and/or windows, make sure your climate control system is in fresh-air mode (running it in recirculation mode will cause moisture to accumulate). And although it might seem counterintuitive, you should turn your car's air conditioner on. The compressor dehumidifies the air, which will reduce the chances of a foggy car windshield. Plus setting it to a high temperature should keep the car toasty, too.
