Defroster nozzle. Front Upper. PartQualifier: upper. upper. w/o night vision. A nozzle / vent to direct HVAC Air to the vehicle's windshield of to defrost / defog the windshield. HVAC Air Distribution Ducts located under the dashboard. Distributor. Heater. Instrument Panel. Outlet. Side. Windshield Defogger Vent. Windshield Defroster Nozzle.