When they come into my shop like this I check several things.First I check with a temperature gun whether it is actually getting hot( a gauge fault)Maybe your local garage may have one and check for you.If it is heating, as it approaches the fan cut in speed I check for operation of the fan.Electric fans usually can be tested by removing plug near thermostat housing or grounding this plug.it should turn on.If you have a viscous fan type(it is bolted to the front of the water pump and free wheels).This should begin to spin faster as the heats causes the viscous to bind.On this type you should feel the heat getting pulled off the radiator and fanning back past the engine and underneath the vehicle.Also ensure if there is a shroud that encompasses the fan and the radiator.Without this on, certain models can not draw heat off the radiator effectively.
Note also if you have air conditionally this should either turn on the electric fan also or switch on an auxillary fan located either beside it or behind the grille.
The fourth item checked is the lower radiator hose.Ensure as holding the revs at cruise speed that it doesnt flatten closed.This can be caused by going soft,or a restriction in the cooling system circuit,but you have indicated that the radiator has been replaced(I am assuming it is a new one)
Hope this helps or get back with your findings and we will work further on it.
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