Where do you put the antifreeze in a 1990 300zx?

To add antifreeze to a 1990 Nissan 300ZX, locate the coolant reservoir, which is typically a translucent plastic tank near the radiator. Open the cap and pour in the antifreeze mixture, ensuring it's the correct 50/50 blend of coolant and water. It's also advisable to check the radiator directly by removing the radiator cap (when the engine is cool) to ensure it's filled to the appropriate level. Always remember to replace the caps securely after filling.