If I assume you compared the old and new pumps, and you were comfortable you put the right pump in.....then I would think you are either air blocked....or perhaps the thermostat you put in is defective.
With the radiator cap off, can you verify that you can see the coolant begin to flow as the engine heats up? That would prove that the pump is pumping, and that the thermostat is at least cracking open. Assuming that you see it start to flow....if you leave it running with the cap off and it heats up further, do you see a healthy steady flow of coolant?
What caused you to want to replace the waterpump and thermostat to begin with? Was there an additional problem or some other symptoms that you were trying to fix?
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