Liquid Cooling System Parts . Toyota L Engine Guide

Liquid Cooling System Parts

Cooling System Parts 

The cooling system is designed to remove heat from the engine to keep the engine operating in the optimal temperature range. Without the cooling system of a vehicle, it would run but it will not stay long. When the engine is overheated the head gasket will be burned, the valve seals will be melted, the piston rings if not stuck it will be broken, the cranked shaft bearings will be crushed or the crankshaft will crack or broken. Any of these issues will come if the cooling system fails to do its job.


The cooling system is comprised of the following parts…

1. Oil: Oil cooling is the use of engine oil as a coolant, typically to remove surplus heat from an internal combustion engine. The hot engine transfers heat to the oil which then usually passes through a heat exchanger, typically a type of radiator known as an oil cooler-Wikipedia

An article on Facts About Motor Oil discusses the importance of Motor Oil.

2. Coolant: Coolant is generally a mix of water and ethylene glycol. Many times called Anti-Freeze, coolant serves many purposes. As the common name implies, coolant prevents freezing, but it also provides lubrication for the water pump, increases boiling point of water, and keeps rust and scale from forming in your cooling system. Coolant must be changed on a regular basis, check your owner’s manual for the recommended schedule. PH level is critical to keeping your coolant from becoming a metal-eating liquid. When you check your coolant for freeze point, also check out the PH level and make sure your coolant has not turned acidic. 

Liquid Cooling System Parts-Radiator coolant


3. Water: Pure water is generally and commonly used as a cooling agent in the cooling system by car owners instead of coolant.  Its high heat capacity and low cost make it a suitable heat-transfer medium. It is usually used with additives, like corrosion inhibitors and antifreeze.

Liquid Cooling System Parts-water


4. Radiator: The radiator is a series of thin channels where the coolant flows through and is cooled by air flowing through it. It is important to keep your coolant in good condition to keep the channels open in the radiator. Following your manufacturers’ recommendation for changing your coolant, to keep your radiator in good shape.

Liquid Cooling System Parts-1978 Toyota Radiator


5. Water Pump: The water pump is either driven by the fan belt or the timing belt on some newer vehicles. The pump moves coolant from the radiator, through the engine, and back into the radiator. The pump has a shaft with a pulley on one end and a pump rotor on the other end. When the pulley is spun by a belt, the rotor moves the coolant.

Liquid Cooling System Parts-1977 Toyota L water pump


6. Thermostat: The thermostat controls the flow of coolant through the engine. When your engine is cold, it actually operates with less efficiency. So until the engine warms up to the ideal temperature, the thermostat keeps the coolant from flowing. Your thermostat can fail in either an open or closed condition. When it fails in the open position, your engine may actually run too cold and you will have bad gas mileage. If the thermostat fails in the closed position, your engine will overheat since no coolant will be flowing through the engine.

Liquid Cooling System Parts-1988-1995 Thermostat


7. Hoses: The hoses carry the coolant from the radiator to the water pump and from the engine to the radiator. Hoses are generally made of rubber and can deteriorate with time. The hose should be flexible and not dry rotted (check for tiny cracks in the hose)

Liquid Cooling System Parts-Radiator hose


8. Radiator Fan: I would include a radiator fan as necessary to be a component of the cooling system. I’m very sure even if you have all those others without the fan your engine will overheat. This fan is responsible for blowing air to the radiator especially when you are in heavy traffic. A related article on Freewheeling Radiator Fan gives more details on the discussion.


In summary, the cooling system is essential in the performance of the engine whether in light or in heavy-duty. It’s a system where each part is inseparable in cooling the engine to avoid burning of gaskets and immediate destruction of engine parts due to excessive heat.



12 thoughts on “Liquid Cooling System Parts”

  1. The importance of the whole cooling systems can never be overstated. This is something ever car owners know and therefore, apply for their own benefit. Neglecting any of these cooling agents oftentimes come at a very high price. I noticed you listed the radiator fan last. I do not think it is the least though. The radiator fan is just as important as the other coolants on your list since it is responsible for blowing cool air into the radiator.

    Thanks for sharing 

    • Thank you, Rhain for coming in and dropping your comment. I can see you are an informed individual with the parts of a vehicle.

      You are right, being negligent in one of these parts will bring a severe impact on the engine and is costly.

  2. The problem with water is corrosion as well as how low is its freezing point being compared to other available alternatives. If we want to extend the life of a radiator: don’t use water.

    This is a list of parts very important for keeping the performance and durability of our car. Don’t under-estimate the importance of keeping the motor within its temperature range of tolerance.

    Water pumps are one of the most reliable parts of this system. Hoses system, on the other hand, gets tired with time and clamps corrosion what ends on spills that reduce system efficiency and increase fluids consumption.

    Thanks for keeping us aware of these details with your post!

    • Thank you, Juan, for the informed comment. Yes, I agree with you with regards to the use of water. The cooling tubes are being trapped with solidified water contaminants and make the water flow irregular.

      Even though the other parts function efficiently if the water pump is not doing its job, meaning it doesn’t pump the water it’s useless.

  3. The cooling system is one of the most important systems in your vehicle. Most people will not do anything during the life of their vehicle to their cooling system until they are stuck on the side of the road.
    Checking this system once a year when the weather is good is a good way to keep on the road.
    Check your hoses and systems for leaks. The coolant level for the water or antifreeze should be checked once a month.
    Most people will not do these simple tasks to keep one of their most expensive investments on the road.
    Do you think a checklist for the cooling system, not just the coolant, is a good thing to do once a month?

    • I do agree with you John that every car owner should consider it very important. Since we want to emphasize the whole cooling system we want every part of it must be check.

      Thank you for leaving your comment. Surely our readers find help here.

  4. All of these parts are so critical to the health of the engine. If the thermostat fails, and the engine components overheat, it can make for very expensive repairs. It’s good to replace some of these items if there’s any sign of wear. On my VW Golf they changed the water pump at the same time as the timing belt, now I know it’ll be reliable.

    • Thank you, John. You are right, addressing the issue immediately will save us from expensive expenses if everything malfunctions and to the extreme busted. Good luck with your car care.

  5. I once stuck on the street because of the radiator. The mechanic said that if the radiator was defective, the coolant would leak out and the engine would not be able to be cooled sufficiently in the long run.
    It was a very expensive lesson for me since then I always check the condition of my radiator.
    Thank you for sharing this post, it will help many people.

    • Thank you for your rich experience, which can give inspiration to our readers to be more observant and have a regular inspection of their cooling system which includes the radiator.

      Now you have the knowledge that is priceless. You did not learn that from an automotive school.

    • If I understand you correctly, Catherine, the channels we are referring to here in the cooling system are the operation allowing the coolant to flow from the radiator to the engine. This is the task of the thermostat which you can read under this article-thermostat-part of the cooling system.

      Thank you for asking a question and being part of the discussion.


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