When it's cold outside and you can't see through your car's windshield, you'll probably reach for the defroster button. But how does the defroster work – and why does it always seem to take forever to clear ice, frost, mist or fog from the windscreen?
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How to defrost car windows FAST (DRIVING TIPS)
Learn all about how car defrosters, demisters and dehumidifiers work.
There are two primary types of defrosters. The first type uses a vehicle's heating, ventilation and air conditioning (HVAC) system to blow warm, dehumidified air directly onto the fogged or icy windshield. The other type of defrost system defrosts and defrosts through a mechanism called resistive heating.
Defrosters that use a vehicle's HVAC system are sometimes called "primary" defrosters, as they are designed to clear the front and side windows, and they work via two main principles.
