Defrosters clear condensation from windows and melt frost, ice and snow. They work differently depending on whether they are for the windshield or the rear window.
How to activate Recirculation mode in defrost mode?
Does A Car Defroster Use Gas? (Explained By Mechanic) - The Driver Adviser
Why does my car have a “defrost” setting, but with cold air instead of hot air? What situations would make it useful? - Quora
How Do Car Defrosters Work?
If a car window fogs up because it is cold outside, should the defroster be set to hot or cold? - Quora
How Do Car Defrosters Work?
Why does my car have a “defrost” setting, but with cold air instead of hot air? What situations would make it useful? - Quora
Quick Question: Where Should The Rear Defroster Button Go And What Should It Look Like? - The Autopian
How to Use Car Defrosters - AutoZone
How to Defrost Car Windows
Repair a Rear Window Defogger (DIY)
How Do Car Defrosters Work?