300ZX V6-2960cc SOHC Turbo (VG30ET) (1984)
Heater Core: Service and Repair
1. Disconnect battery ground cable, place temperature control lever in HOT position, drain cooling system.
2. On models with A/C, discharge A/C system using refrigerant recovery equipment, disconnect refrigerant lines to evaporator, then plug lines and
open fittings.