How much freon is needed to charge a 1985 Nissan 300ZX?

A 1985 Nissan 300ZX typically requires about 2 to 3 pounds of R-12 refrigerant (Freon) for a complete charge of its air conditioning system. However, if it has been retrofitted to use R-134a, the amount needed may be slightly less, around 1.5 to 2.5 pounds. It's essential to check the specific vehicle’s service manual for precise specifications and ensure the system is leak-free before charging.