Every Virginia-registered motor vehicle manufactured for the 1969 or subsequent model years and required to be equipped with a windshield shall be equipped with a windshield defroster or defogger. The defroster or defogger shall be in good working order at all times when the vehicle is operated on the highways.
Windshield defroster or defogger
Va. Code Ann. § 46.2-1055.1, under Chapter 10. Motor Vehicle and Equipment Safety..
Va. Code Ann. § 46.2-1055.1