Expansion of the water inside due to heat causes the system to be pressurised.
A radiator can crack due to a build-up of pressure from overheating, corrosion over time, or physical damage such as a collision or impact.
To pressure test a radiator cap, you will need a radiator pressure tester kit. Remove the radiator cap, attach the pressure tester to the radiator neck, and pump it up to the specified pressure level. Observe for any leaks or pressure loss to determine if the radiator cap is functioning properly.
a hole in the radiator
A hole in the radiator would do that, or a damaged radiator cap. It could be a cracked engine block that is allowing cylinder pressure into the cooling system, pressurizing the water until it breaks through a weak spot in the radiator.
the radiator pressure cap was invented by Albert Einstein
Wrong PSI radiator cap or defective radiator cap installed. NEW ANSWER: The above answer is true ( COULD BE ) But I would bet you have a BLOWN / LEAKING head gasket that is building pressure in the water / cooling system.
No, there should not be pressure in the radiator after cooling down. If there is still pressure, it could indicate a problem with the radiator cap or the cooling system, such as a leak or a failing pressure release valve.
Radiator hoses can collapse due to a restriction in the cooling system, such as a blocked radiator or thermostat. This restriction causes a vacuum to form in the hoses, leading them to collapse under the pressure difference. Additionally, weakened or deteriorating hoses can also collapse over time due to the force of the coolant flowing through them.
Does the radiator cap hold the correct pressure? Has the coolant been in the motor for a very long time? Is there alot of scale buildup on the inside of the radiator? Is the water and antifreeze mixture right? Is the cars oil pressure good? Is the thermostat stuck closed? Any of these will do it.
You attach a pressure test kit to where the radiator cap goes, and pressurize the system. If it holds pressure, it's good.
The radiator cap controls cooling system pressure.The radiator cap controls cooling system pressure.
Normal causes are low coolant and an inoperative radiator fan.Normal causes are low coolant and an inoperative radiator fan.