It is measured in Fahrenheit on US cars, and boiling temperature is 212°F. The scale indicates coolant temperature and over 200 would mean overheating, as steam could form in an unpressurized system.
Low on coolant or a sticky thermostat, replace it.
Thermostats work by only allowing so much engine coolant to go to the engine to keep it at about an even 200 degrees. The are cheap easiy to put in but can become faulty very easily.
Bad sensor, low coolant, sticking thermostat.....................
Could be, sticky thermostat or low coolant level.
probably the coolant level sensor... Does the temprature gauge go up to hot then down to normal?
Normally 180 On hot days it might go to 200
You may have a faulty coolant level sensor
Could be low on coolant or a faulty thermostat.
The coolant is low, probably from a leak. You need to have it checked with a pressure testor.
THATS WHAT THE OVERFLOW/EXPANSION PACK IS FOR. WHEN ANTIFREEZE/COOLANT BEGIN TO BOIL IT EXPANDS AND IT NEEDS A PLACE TO GO. THERE FOR IT GOES IN TO THE OVERFLOW/EXPANSION PACK. THIS PREVENTS DAMAGE TO THE ENGINE/RADIATOR AND OVERHEATING. THERE IS ALSO THE POSIBILITY OF A MALFUNCTIONING SENDING UNIT/GAUGE.
The car can begin to overheat because it is low on oil or antifreeze/coolant. Your radiator can also be acting up. It is best to address this as soon as possible and not to let it go.
If it's 200 degrees! Your heater wont go that hot. Trust me.