Defrosters that don't use a car's HVAC system are sometimes referred to as secondary systems since they are designed to defrost things like rear windshields and mirrors.
A na-akpọ ndị na-adịghị eji ụgbọ HVAC eme njem ụgbọ ala mgbe ụfọdụ dị ka usoro "nke abụọ" ebe ọ bụ na e mere ha iji kpochapụ ihe ndị dị ka windshields na enyo.