i went for a drive and the tempt just kept going up. i went 5 k's and turned around.
i checked the thermostat seems to open all right.
is it waterpump or could it be the radiator is stuffed.. all seem to be ok.
HELP.

its the radiator

thanks. i was thought it was just that. pisses me off as i have just tidied up the engine abit and wanted to cruise.

If you have access to compressed air, remove the radiator, half fill with water and blow air into the bottom tank, and repeat. This will release some blockages, or just get it done professionally.

I got me self a 1200 ute!Doing the same thing!Got raditor flushed by red devil,didnt fix it!Got it compression tested!Hot air gases going into water chamber!Since then I have had to do head gaskets and then had to do the heads!Hopefully it's stopped my over heating problem!!

Oh great! hopefully i will be able to get away with a good flush. it was running fine until it sat in the panel shop for 3 months.
anyway i will find out on saturday. also finish putting on the card linkage kit.

Have you checked:
Welch plugs, air leaks, radiator cap, dirty cores in radiator, blocked/torn lines in radiator (little sh|t like grass reeds and seeds are buggers for these), water pump fins, kink in hoses, thermostat correct rating, are your water galleries blocked? reverse flushed the block or radiator? does water flow like the niagra falls?
There are SOO many options and the way to go is...ILLIMINATION!! tis key and then the problem will be solved!
When i bought my radiator (2nd hand) i ThOUGHT i got a bargin, good notch to...no way was completley stuffed! So i got the same one but fine nick for free!
A great test for radiators remove from car, hold your hand over the bottom pipe and fill up with water till full then let your hand off and it should flow out REALLY fast like im talking no water left in there in less than 15 secs (sounds about right??)
And before fitting again remember to reverse flush and forward flush the block and get all that crap out of the galleries coz we dont want any little nasties floating round that beautiful Datsun machinery!

I spose im stating the obvious here as the topics been brought up millions of times but this is my experience & im just sharing it!
Let us know how you go

Cheers
Dave