Do you have to remove the radiator to change water pump on 97 grand Cherokee limited v8?

No but it will give you alot more room to work and radiator fins are very delicate. If you insist on keeping the radiator in place cut out some thick cardboard and place it over the fins. I would most definitely remove it. I have replace the water pump, radiator, and thermostat in my 98 limited 5.9L