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To allow the coolant to reach higher temperatures, with out boiling. When a liquid is pressurized, it can exceed it's boiling point and remain liquid, but when the pressure is released (like removing the pressure cap) the liquid is instantly tuned into super heated steam.

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Q: Why is a radiator pressure cap needed in a water cooled system?
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Related questions

Where is coolant pressure release valve for a 2004 dodge caravan?

The radiator cap controls cooling system pressure.The radiator cap controls cooling system pressure.


Should there be pressure in the radiator after cooling down?

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.


How do you pressure test radiator cap?

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.


How do you pressure check a car radiator for leaks?

You attach a pressure test kit to where the radiator cap goes, and pressurize the system. If it holds pressure, it's good.


Does a 1997 5.2L Dakota have an intake coolant radiator?

Not sure what the question is getting at, but yes it does. There is no dedicated coolant radiator specifically for the intake, it shares the same coolant system and radiator as every other water-cooled system in the vehicle's engine.


How does an automotive radiator reservoir work?

A hot radiator releases excess coolant through the spring-loaded cap in to the reservoir, and when cooled the partial vacuum created by cooled radiator pulls it back in. A reservoir should be only about 1/4 full cold on a system that uses a radiator cap, some cars have a pressurized cap on reservoir and no cap on radiator


How does an automobile radiator system work?

The radiator consists of cooling fins around tubing which the coolant flows through. A water pump circulates coolant from the radiator through the engine. A smaller radiator around the dashboard makes up the car's heater. An automotive cooling system has 6 basic components; the radiator, coolant/water, pressure cap, expansion tank, thermostat, and the water pump. When an engine is running, the water pump circulates the engine coolant inside the engine. As the engine heats up, the thermostat opens (usually at above 160 degrees), which allows the engine coolant to be pumped into the radiator, through the top radiator hose. The coolant flows through tubes inside the radiator, and is cooled by air passing over the car's grill. The cooled coolant exits the radiator and reenters the engine through the bottom radiator hose. The pressure cap holds the entire cooling system under pressure, which allows the coolant to reach higher temperatures without boiling. The expansion tank holds extra coolant for the system and allows for extra capacity when the coolant expands with the heat.


How do you check for a radiator leak on a 1999 Dodge Dakota Sport v6?

You use a radiator pressure tester to apply pressure to the cooling system. You can then look for leaks.


Why radiator get dry?

There is a leak somewhere in the cooling system. Have the cooling system pressure tested for leaks.


Why does a car need a radiation?

A car doesn't need radiation, it needs a radiator. The heat is released from the radiator, which is part of it's water cooling system. All internal combustion engines require some type of cooling system to control the operating temperature of the engine. Basically there are two types of cooling systems for gas engines: air cooled and water cooled. An air cooled system for a car would be ineffective because the engine is enclosed thus it wouldn't receive enough air-flow to control the engine's operating temperature. this same principal is why an air cooled engine can be used on a motorcycle. A water cooled system works by having a radiator connected to the engine which has a pulley driven water pump that constantly circulates the water/coolant mixture from the radiator to the engine. The design of the radiator is made of metals that dissipate heat quickly which cools the water which in turn helps to cool the engine.


I have no pressure in my radiator after it has warmed up what could be causing this to happen?

This could be caused by a leak in the cooling system, a malfunctioning radiator cap, a blocked radiator, or a failing water pump. It's important to have the system diagnosed and repaired by a mechanic to prevent overheating and engine damage.


Where is the cooling system pressure relief valve on a gmc 4.8?

Radiator Cap?