In all probability you either have a bad radiator cap or an air lock.
After coolant is added run vehicle to normal operating temperature and re-check coolant level
White smoke from tailpipe when engine is at normal operating temperature? Oil mixing with coolant? Coolant mixing with oil? Run engine to normal operating temperature remove dipstick and let a drop fall on hot part of engine - oil will smoke coolant will "sizzle" Misfire at 2 adjacient cylinders?
Depending on the engine, the coolant temperature in a Cadillac could be from 180 to 195 degrees. The thermostat can be changed to give a lower or higher temp reading.
What is a normal operation in city traffic and in highway for corvette 2002 with LS1 engine?
It depends on which model year / engine. The E46 330i operating coolant temperature is about 97 Celsius.
You may have a faulty coolant level sensor
I am an ASE certified technician. Your normal engine or coolant temp should be 190 - 210.
this sounds like a bad thing to me...like the reservoir and/or the cooling system, has no antifreeze in it and heat from the engine is exiting through the cooling system. Does your temperature gauge read in the normal range? Is the car running OK? FriPilot
Oil mixing with coolant? Coolant mixing with oil? Run engine to normal operating temperature, remove oil dipstick and let a drop fall on hot part of engine - oil will smoke coolant will "sizzle" White smoke from tail pipe when engine is at normal operating temperature? Engine misfire from 2 adjacient cylinders?
Below 220 degrees .
Generally speaking, it should not get any hotter than the normal operating temperature of your engine coolant.