3lt Patrol sometimes overheats

Not specific to your car but I'd be checking coolant level, radiator cap and thermostat operation and depending on how many Ks you've done drain and flush cooling system. Also check out post 20842 by Roachie. You are obviously working it pretty hard when in 4wd with the A/c on, the A/c should turn off if the engine gets too hot, does it do this?

It's a car, they get hot, radiators block up, thermostats fail to open, electric thermofans stop working, water pumps wear out, radiator caps leak, head gaskets leak, clutch fans become ineffective, Mars circles Uranis and the tide goes up and down !!!

It's all part of life.

Radiator repairers/mechanics fix them, everyone is happy again.

WOW I really am feeling cynical today.

If it has been as hot in your neck of the woods as it has been in Kal then no wonder even the work tojos have been getting warm. I am assuming it is not that old so unless you have been using bore water to fill it up the radiator shouldnt be blocked inside
1st thing I would do is look for seeds blocking the radiator this not only involves chacking the front of the air con condensor but looking between the radiator and condenseras crap gets sucked up here and blocks the rad no worries. Also when the gauge heads north next time jump out and check the fan out as you turn it off. With the motor stopped it should do no more than 1 turn otherwise it needs service/replacement. Ccheck for mystery coolant loss and cracked head (unlikely) otherwise as per previos reply. If all draws a blank get the radiator removed and rodded as there could be internal blockages

i herd from an arb dealer the early gu 3l turbos had a heating problem which was a nissan eng fault.he said nissan would fix as a recall problem so call nissan and ask.

good luck