So driving around my car is fine and at a good temp , stop for not Evan a minute an it's over heating , any ideas ?

Assuming its a Datsun with an A12, check your coolant level, then check your thermostat for proper operation and opening, then flush the radiator while you're at it, seeing as the circuit will be empty. Flush the block as well and replace with a quality coolant.

Could be air flow. Bolcked radiator does this too. Once moving theres enough airflow ovrr core to cool it.

Sorry yes 1200 ute a12 , The block should be fairly clean, It was re built earlier this year , I checked the coolant a few days ago an it looked great, nice and green still , it's wierd , I let it idle for 20 minutes of a morning. And it's still cold , then middle of the day it over heats, could it possibly be the air temperature?? Is there any way to clear the core if it is blocked?

sounds like you don't have a thermostat fitted. Or it could be faulty.

do you have the standard engine fan or an electric/thermo fan?

I'll second an airflow problem. Perhaps a faulty electric fan setup.

try this.

take off the bottom radiator hose, draining all the water.
stick the hose into the top of the radiator and turn it on
if the water does not flow into the radiator quickly i.e. if it overflows at all then maybe the core is blocked

a radiator should flow easily and quickly.... try it with the hose on one side then the other to see if this makes a difference

It's a simple test that only costs you a little time and water

Jus my 2 cents check engine timing,replace the radiator cap .

so the ute has started to over heat while driving, im going to remove the thermostat when it cools down, if that dose not do anything its a blockage right? , its the standard fan, im looking into a thermo

Overheating while driving? Or only when you come to a stop (idling)?