What is the operating temp. for a 1997 Cadillac with the Northstar engine?

I am looking to buy a Cadillac That had over heating problems. There is now a switch that starts the cooling fan when the key is turned on. the engine get up to 190f* at idle. Is that the normal temp. What should the on board computer tell me? I have never owned a cadillac and don't know what to look for. Any input would be welcomed. thanksWhat is the operating temp. for a 1997 Cadillac with the Northstar engine?190 degrees is where it should run. But if its been hot than I would be leary of it. The northstar is bad about blowing head gaskets. If it blew a gasket and then got hot and they fixed it may be ok for awhile.and then cause problems again. If something else caused it to get hot and only fixed that the head gaskets could be next. Its an expensive car to do engine work on. Also if its got a lot of miles on it they also start leaking oil. Its a common problem on them also. And the only way to fix the oil leak is to pull the engine out and tear it apart. So if its got a lot of miles on it I would pass a go to something else as repairs will eat you up..........md........EDIT EDIT EDIT EDIT.......155000 miles is a lot I would look for something else as you will have problems sooner than later.........mdWhat is the operating temp. for a 1997 Cadillac with the Northstar engine?This car should run between 180 to 210 degrees, the fan will kick on around 190 to 195 degress to keep it in operating range.