The engine should be running cool as if it is raining.
The temp gauge should also be relatively steady.
A wandering temp gauge means problems.
Could be a few things and maybe a compression test is in order, how many K's on the vehicle.
If you were getting overheating before and have replaced the fan clutch and thermostat and if the shrouds etc are all OK I would be thinking of getting the Radiator rodded.
Just flushing them doesn't work all that well it is best to remove the Rad and get it serviced correctly.
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