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How A Radiator Works

Updated on February 20, 2012

Radiator

Your car's engine runs at very high RPMs(revolutions per minute) which you can imagine generates a lot of heat. 

Somehow the engine has to be kept cool to prevent it from breaking down, yes I guess it could be cooled by air but that might not work so well. So we all have radiators in our cars, but how do these work?

Here's a step by step guide to how your radiator works...

Coolant

It all starts with coolant and water. You have to fill your radiator with a mixture of water and coolant.

Coolant is also called antifreeze, because it does just that it keeps the water in the radiator from freezing in cold weather.

The mixture of water and coolant runs throughout the engine to cool it down then back to the radiator and the cycle begins again.

The Fan

The radiator fan is the next part in the cooling system. The fan runs, when it needs to or in some older vehicles the fan runs whenever the engine is running, to cool the radiator and the fluid inside it. 

The fan is located directly in front of the radiator and behind the grill, it pulls in cold air from outside of the vehicle.

Thermostat

The thermostat measures the temperature of the water/coolant and when it reaches a certain temperature it triggers and tells the fan to come on to cool the radiator fluid.

Engine

After going through the thermostat the coolant/water then moves into the engine, cooling it on it's way.

Radiator

Now back to the radiator goes the fluid. The mixture runs through the engine and returns to the radiator.

Reserve/Overflow

The reserve or overflow tank is often located on the side of the engine bay. It stores coolant/water.

What happens is this...

When the engine warms up so does the water/coolant and when it does this is bubbles or boils, but where does it go? Into the reserve!

The hot water goes into the reserve until the engine cools down.

Once the engine begins to cool the radiator fluid stops boiling and the fluid level goes down, but if the fluid level goes down the car will overheat, so the radiator pulls water/coolant from the reserve tank to make up for it.

You see if there was not reserve tank the water would boil over and out of the radiator, if there was a release at least, and then when the engine began to cool it would overheat!

It's all one continuing cycle, perfectly invented so we can get around safely and reliably!

Pictures To Refer To

Radiator hosing diagram
Radiator hosing diagram
Car Radiator
Car Radiator
Radiator Fan
Radiator Fan
Radiator Overflow/Reserve Tank
Radiator Overflow/Reserve Tank
Thermostat housing
Thermostat housing
Thermostat
Thermostat

Comments

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    • profile image

      Awais 

      6 years ago

      I have idea related to radiator. we can make AC using radiator, in radiator we just use water not any other liquid. I have done experiment in my Home.

    • profile image

      panji 

      6 years ago

      good tutorial

    • profile image

      paul 

      9 years ago

      your description of thermostat does not describe the thermostat in the photo. i.e., there are two thermostats, and one is a temerature operated valve that prevents coolant circulation until it reaches operating temperatures. Also moderates the flow in cooler weather to keep the engine warm at all speeds. ( I live in Canada. Driving without a thermostat installed equals no heat in the car. Brrr!!)

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