My car is cadillac deville 1998.i just change the radiatore but still have same problem.i know is 220 not over heating temp but at that point the steem start coming from the radiatore.
Make sure the cap on the expansion tank is holding pressure, it may need replacing.
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.
Should run between 195 and 215. Get it pressure checked to find leak. Head gaskets give problems on this motor.
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