The car defroster is one of the most misunderstood parts of a vehicle. It’s a simple device that performs an important service. Here’s what you need to know about your car defroster: Kinds of Defrosters In general, there are two kinds of defrosters. The most common one is located on the front of your vehicle. This uses the heat generated from your vehicle’s engine and from the HVAC system to direct air onto the window. The heat is pulled from the engine block while the cool air is treated by the HVAC.  The other kind of defroster is most commonly found in the back window. If your vehicle has a rear defroster, there isn’t an engine block to send direct