Possible reasons for overheating:
Low or out of coolant
Clog in cooling system
Thermostat failure
Cooling fan not operating
water pump failure
If the Chevy Celebrity radiator is smaller that the Saturn radiator it might well overheat from not enough cooling capacity. If the Chevy Celebrity radiator is the same size or larger than the Saturn radiator I would think it would not over heat.
check your thermostat
Blown Head Gasket or Bad Cylinder Head
over charging or bad bearings its about to let you stranded change it
I would suspect low fuel pressure would cause both conditions.
I had a 1987 Chevy Celebrity that would start and then immediately die. It turned out to be bad fuel injectors. I replaced three fuel injectors and the problem has not returned.
Too high a temperature
Check to make sure the fan clutch is engaging.
I have not seen a standard Chevy Celebrity with a toggle switch under the dash. I would suspect that is something a previous owner installed.
To answer your question I would need to know the year of your Celebrity as well as which one of the four transmissions it has.
Not enough air in the fuel
yes, if you have coolant in the oil the oil doesn't give the rod bearings the lubrication that they need, they then overheat, and fail.