Nissan Repair: over heating, radiator cleaner, fan clutch

Question
hi i have a 1986 300zx it over heats after 30 mins of drive time iv changed the fan clutch put a new thermostat changed the hoses and checked for lecks none are present and used a calcium and rust radiator cleaner but it still over heats plz help.

Answer
Hi Aaron -

Please give me more information if you would -

Have you inspected your radiator fins and circulation?

Does it overheat while driving city traffic, or at higher speeds?

Does your car have air conditioning? If so, any difference when the A/C is on/off?

Thanks Aaron -
aloha
calvin