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i would have to say ck. the easast things first,when was the last cooling system flush making sure all cooling system parts are clean and new coolant added(old coolant looses its abilaty to work properly when old)then have the thermostat ck to make sure it opens and closes at the proper temp.
Check for coolant flow at the Purge line,this is a common problem on the Northstar. There is a small diameter hose coming from near the top of the coolant tank,this is the purge line. With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.
My retired uncle has a 97 cadillac deville sts that runs well but after a short distance or time idling begins to overheat. He has replaced the water pump, thermostat and had the radiator and head gasket checked. Unfortunately he lives in a rural area and there is no local cadillac dealership for diagnostic repairs.