2000 grand cherokee 4.0 runs hot, 200,000 miles,new radiator,relay & thermo

I had a 4.0 a while back that had all the impellor bades on the water pump rotted until they were almost flat! Had to be over 2500RPMs to get the slightest sign of circulation , at idle no circulation at all. ......Maybe you can remove t-stat & see if you have any coolant flow & if it changes off-idle?

Is coolant level the same or is it loosing some? Pump would be the last thing I would try but considering the mileage it's a possibility. Something simples as a radiator cap or air in the system can also cause overheating, if you aren't loosing coolant. Was the original issue just overheating or leak?