Water in a car radiator does not normally boil. In some old cars, the cooling systems would run at about 220 degrees Fahrenheit. The pressure would be high enough so that the water would boil at 250 degrees. Today, you do not put water in radiators but coolant. It is much more efficient than water for cooling engines.
Water must reach 100° C before it will boil. Since hot water is closer to 100° C than cold water is, hot water will boil quicker than cold water goes once you have started to heat it.
salt water will boil. also will freshwaer
The time needed for water to boil depends on various factors such as the heat source and the amount of water. Generally, it takes around 5-10 minutes for water to boil. Adding salt to water increases its boiling point, meaning it takes longer for saltwater to reach boiling point compared to plain water. However, the difference in boiling time is minimal and may not be noticeable in everyday cooking.
Sea water will boil at higher temp
Hot air from a radiator reaches the other side of a room by convection current. Convection current is when hot water/ air rises, hot water/ air cools, cool water/ air sinks, cool water/ air warms and then the cycle starts over.
Water under pressure has a higher boiling point, if the water is already hot enough to boil it will suddenly erupt when the cap is removed and pressure relieved.
replace your radiator cap...
A small amount of water will reach it's boiling point sooner than a large amount of water. It will not boil faster.
Can be the thermostat which is cheap to replace, or it might be the head gasket which is expensive.
Slower, the more water, the more time required to reach boiling temp.
It's a pressurized system. When it exceeds cap release pressure, it comes out.
Blown head gasket?
Water must reach 100° C before it will boil. Since hot water is closer to 100° C than cold water is, hot water will boil quicker than cold water goes once you have started to heat it.
Low coolant, inoperative radiator fans, stuck thermostat, failed water pump, restricted radiator, head/headgasket.
possibly a bad head gasket you might need more coolant
Because the temp gauge is not giving you the temperature of the water/steam in the radiator. You may have a bad head gasket or a cracked head causing the coolant to have that boiling effect.
As a very temporary emergency situation, yes. Without a proper mixture of coolant and water the water will boil at 212°F.