First, you must have a properly installed thermostat that is working correctly. Second, Northstar engines are notorious for air in the cooling system after draining and refilling - keep checking the purge tank level after overheating and after the cooling system cools down. Third, make sure your cooling fans are working correctly (relay, fuse, temperature sensor) - check to make sure both are running when it overheats. If all the above is correct, the problem will probably be blockage in the system (try a flush) or your water pump itself is failing.
SOURCE: 1996 Cadillac Deville overheating- head tested, no
remove pump and check that the imèller which is plastic hasnt seperated from drive shaft
SOURCE: Will a leak in the coolant crossover pipe cause my
no. a leaking headgasket or intake manifold will however.
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