When your car gets too hot, it can be very bad. So you need to know how to cool down a car engine quickly. If your air conditioner stops working, it could be because your car is too hot. If the temperature gauge has moved to the “hot” side, you shouldn’t keep driving. When your engine gets too hot, your car might not blow up right away, but driving with an overheated engine can do a lot of damage to your car. It’s better to pull over and fix it right away than to risk having to pay a lot of money to fix it later.

Any licensed driver needs to know how to cool down an engine that has become too hot. If you can figure out what’s wrong and fix it yourself, you can get back on the road quickly, avoid expensive mechanical problems, and learn how to cool down a car engine quickly.

What is the Engine Cooling System?

What is the Engine Cooling System
Photo Credit: www.mechanicaleducation.com

The cooling system is made up of a group of parts that allow liquid coolant to flow through the passages in the engine block and head, where it soaks up heat from the combustion process. The hot fluid will then go back to the radiator to cool down through a rubber hose. As the hot water flows through the thin tubes and into the radiator, it is cooled by a stream of air.

Modern engines that burn fuel are cooled by both air and water, but some engines only use air or water to get rid of the engine’s waste heat. Air from the atmosphere is used to cool small or special-use engines, which makes the system lighter and less complicated. In some engines, a closed loop of water transfers heat to the radiator, which cools the engine.

Water can move heat from the engine faster and better than air can. The parts of the water cooling system make the engine heavier, more complicated, and more expensive. The system works well for engines with a lot of power that wastes a lot of heat but can move a lot of weight.

How do Cooling Systems work?

Every time the spark plugs light the fuel in the engine to make it move, it’s like a small explosion. Explosions make heat, and when you’re going 50 mph and there are 4,000 explosions per minute, things heat up quickly. Even though cars have gotten better over the years, heat is still made when they move. Then the question is arrive how to cool down a car engine quickly?

There are two ways for cars to cool down: liquid and air. But liquid cooling is more common than air cooling, which is only found in motorcycles and older cars. But how do cars get cool with liquid cooling systems?

Liquid coolant flows through tubes in the engine, picking up and absorbing heat from other parts until it reaches the radiator. The radiator cools the coolant by forcing air through the grill. Once the coolant has cooled, it flows back through the engine and soaks up more heat before going back to the radiator.

But what about the winter? The thermostat is controlled by a computer, which lets coolant flow through the engine. If it is below the set temperature, it goes back through the engine and doesn’t go through the radiator until it needs to be cooled. Also, coolant systems let your engine warm up faster on cold mornings, making it run more efficiently.

How To Cool Down Overheating Engine Fast

Now that you know what makes your engine overheat, you need to know how to cool down a car engine quickly from overheating.

If your engine starts to overheat, newer cars will let you know on the dashboard. Older cars, on the other hand, have that good old arrow that you have to watch yourself. This old system is easy to keep an eye on. You have two letters: C for cold and H for hot (hot). If the arrow is in the middle, you should be fine. If your arrow starts to move toward the letter “H,” which stands for “hot,” that’s the first sign that your engine is getting too hot. Don’t get too scared and don’t forget these steps.

Cool Down a Car Engine from Overheating:

  • When the arrow on your dashboard moves toward the letter “H,” which stands for “hot,” this means that your engine is getting hotter. You don’t have to think the worst, because this can happen if your engine is overloaded. At this point, you need to turn off your air conditioner and turn on your heater on full blast. This will let the warm air from the engine get into the cabin. You need to keep driving and keep an eye on the arrow.
  • If the temperature is still going up, park the car on the side of the road where it will be safe.
  • Stop the car’s engine and lift the hood.
  • All you can do at this point is wait for the engine to cool down. Make sure you don’t touch the engine when it’s hot, or you’ll get burned.
  • Once the engine heat has gone down, which will take about 25 to 30 minutes, use some cloth or gloves to open the radiator cap.
  • Check to see if the radiator has coolant in it. Add coolant if you don’t have any. If your car doesn’t have coolant, you can add water instead. Take your car to the closest repair shop.
  • Even if there is coolant in the radiator and the engine is still getting too hot, you shouldn’t drive the car. Put it on the side of the road and call a tow truck. You don’t want to drive your car if the engine is too hot because the damage could cost you a lot of money.

How long does it take to cool an engine completely?

In theory, forever. The heat loss will depend on how different the engine is from the rest of the environment. As the engine cools down to almost the same temperature as the air around it, the heat loss will become very small, so it will take hours for the temperature to drop to the last few degrees. At some point, you won’t be able to tell the difference, but very sensitive instruments will show that it’s warmer than the environment for a long time.

In the real world, an engine is a big pile of iron and steel. When you turn it off, you lose both the circulated coolant and the forced air cooling. It will take at least a couple of hours to cool down enough to work on, and it may be a long time before you can feel that it is cold. Some places will be hotter than others, and they will cool down at different rates.

But it will take a few hours for the engine to cool down enough for you to work on it comfortably.

How to Cool Down a Car Engine Quickly Steps

Here are a few steps for how to cool down a car engine quickly:

1. Open Hood

If you need to get back on the road, opening the hood and letting the engine cool down can help a lot. The first step to cooling down the engine is to turn it off. Opening the hood gives the engine more space to cool down.

2. Blast the Heat

This method may seem strange, but it can be very helpful. If you keep driving a car that is too hot, you must turn off the air conditioner and crank up the heat. It will probably be uncomfortable, but the hot air will flow into the cabin and out of the engine, which will help the engine cool down.

3. Befriend Neutral

If you are stuck in traffic and can’t pull over, putting your car in neutral and revving the engine a few times can help. This turns on the fan and the water pump, which makes them work faster. This will make your car’s radiator pull more air and water through it, which should cool down the engine.

4. Coast

If you have to keep driving, put as little pressure on the gas pedal as you can. The less you have to work the engine, the more time it will have to cool down a little. But this is not the best way to cool down the engine.

How Long Does it Take For a Car to Cool Down For an Oil Change?

About the same amount of time is needed for both checking and changing the oil. If the car is running, let it cool down for 30 minutes before you change the oil.

But, just like when you check the oil, you should let the car run for a few minutes if it is cold. By running the car, the oil will warm up and flow more easily. Before changing the oil, a little bit of heat will speed up the process by a lot.

How Long Does it Take For an Engine to Cool Down to Change Spark Plugs?

The best time to change your spark plugs is after the engine has been cool for about 8 hours, or all night or day. But if the problem is with the spark plugs, you should be able to fix them after the engine has been off for 30 to 60 minutes.

Since spark plugs are partly made of metal, the metal part can keep the heat for a long time, which could be dangerous. Because of this, experts say that you should play it safe and just do a cold engine job.

How to Cool Down a Car Engine Quickly From Overheating Tips?

If you like it hot in the summer, but you want to help your car stay cool when the temperature rises, here are some tips. If the engine runs too hot, it can hurt the car and put you in danger. Here are some things you can do how to cool down a car engine quickly:

1. Park your car in the shade

Both you and your car can feel the difference in temperature between the shade and the sun. Not only does parking in the shade keeps you cool, but it can also help your car last longer. Not enough shade? Use a sunshade to keep the car from getting too hot inside. 1

2. Tint your windows

Window tinting or window film can be put on your car’s windows by a local dealership or auto body shop. This will help keep your car cooler and protect it from sun damage caused by UV rays.

3. Use car window shades

Having window shades in your car is helpful because you can’t always be sure you’ll find a place to park that is shaded or covered. These UV heat shields will keep the inside of your car from getting too hot, and they will also protect it from the sun’s damaging rays.1 You could even get window shades that are made to fit your car’s make and model. These sunshades can be better at blocking all the sun’s rays.

4. Leave windows (slightly) open

When you leave your windows slightly open, air can move through the car. This is especially true when the hot air inside rises. But if you park your car outside, we don’t think you should leave more than a couple of centimeters between the top of the window and the door frame. You don’t want a thief to be able to open the door. Also, turn on your alarm when you park your car.

5. Turn the floor air vents on

Most people get in their cars and turn the air vents on the dashboard to “high” to get the air moving. But it’s better to send the air through the vents on the floor. Hot air rises, so turn your vents to the bottom and turn your blower to its highest setting to get rid of it. Then, when the car starts to cool down, you can open the top vents again.

6. Use the fresh air setting instead of recirculation on your A/C

Turn your air conditioner’s fresh air setting on for about 10 minutes. When you use the recirculation setting, you just move the hot air around your car, so you should use it after your car has had a chance to cool down.

7. Cover your seats

Most modern car interiors are as dark as a coal mine, which makes it hard to stay cool. Especially leather seats can get too hot and sticky, and if they are constantly hot, they may wear down and crack. You could put on light-colored seat covers, or you could choose lighter upholstery from the start. Spreading a towel over the seat will help you stay cool in the short term.

8. Invest in a remote starter

With a remote starter, you can get your car cool before you even get in. This can make it so you don’t have to run the AC the whole time you’re driving. Instead, you can use the fan to bring in the fresh air.

9. Keep your eye on the car temperature gauge

The device is on the dashboard, and the needle should always point toward the middle. If it says “hot,” stop the car, shut off the engine, and let it cool down.

10. Turn on the heat to cool the engine

On a hot summer day, you might not want to turn on the heat, but doing so can pull hot air out of the engine compartment and cool the engine. It won’t fix the problem itself, but it’s a good way to deal with it on long trips.3

11. Add engine coolant

This is very important when it’s hot. Open the hood and look for the coolant reservoir to check the coolant level. The reservoir has lines that show how much coolant is in it. If it’s too low, just add the right amount of coolant and put the cap back on. A common way to sell engine coolant is as a 50/50 mix of water and coolant. You can also buy the coolant in a concentrated form and mix it on your own.

Safety tip: Never add coolant to an engine that is already hot. Wait until the engine is cool to take off the cap or pour coolant into it.

12. Add water to the radiator if you are out of coolant

Even though you shouldn’t use water to cool your engine for long trips, it will work in a pinch. You should put warm water in your radiator after the engine has cooled down. The big difference in temperature between hot and cold water can cause a crack in your engine block.

13. Have your radiator flushed by a mechanic

Even if you keep the right amount of coolant in the engine, it will get dirty over time and need to be changed. A radiator flush, which is also called a coolant flush, is when the old coolant is drained from the radiator, it is cleaned with flush fluid, and a new coolant is added. Mechanics say that a flush should be done every 40,000 miles, but you should check your owner’s manual to see what the manufacturer says.2

14. Consider replacing your car battery

If your car’s battery is more than three years old, it may not give as much power as it used to. This makes your car work harder and can cause it to overheat. Your mechanic will be able to tell you if you need a new battery. Learn when you should change the battery in your car.

Components of Engine Cooling System


This part cools the engine and is made of aluminum tubes and strips that go in and out of the tubes. Through a hose, fluid that is very hot flows through the radiator. The heated fluid is then moved from the tube to the stream of air, which is then blown into the air.

Cooling Fan

The radiator, which is closest to the engine, is where the cooling fan is. The part is made to keep your fingers safe and guide airflow. While the engine is running, it blows air into the radiator to cool the hot fluid, so the fan helps to lower the temperature of the radiator.

The electric fan in a modern car is controlled by the car’s computer. There is a temperature sensor that checks the temperature of the engine and tells the ECU about it.

Cap for the pressure and reserve tank

Now, radiators have a pressure cap that lets coolant flow out as it expands and the coolant is under pressure. So, the job of the pressurized cap is to keep a certain amount of pressure in the cooling system. The spring valve on this cap was set to the right pounds per square inch (psi). If the pressure goes above the set points, the valve opens and a small amount of coolant leaks out.

A reserve tank is a place where the coolant that leaks out of the pressurized cap can be stored. Most of the time, the tank is made of plastic, and it can show how hot the coolant is.

Water Pump

A water pump is another important part of a system that keeps an engine cool. It is attached to the front of the engine and keeps the coolant circulating as long as the engine is running. The part is made of cast iron or cast aluminum, and it has a pumping blade called an impeller.


A thermostat is just a valve that can sense or measure how hot the engine coolant is. If the coolant isn’t hot enough, the thermostat stays shut. Once the coolant reaches a certain temperature, the thermostat opens, letting the coolant flow through the radiator.

Core Heater

When needed, hot coolant is better for the inside of the car. So that this can happen, the cooling system has a heater core that looks a lot like the radiator. The part is connected to the engine with a pair of rubber hoses that bring coolant from the water pump to the top of the engine and bring it back. There is a fan blower that moves air through the heater core. The hot coolant in the heater core then heats the car’s interior.


Hoses allow coolant to move from the radiator to an internal part of the engine and back to the radiator, as well as to some other parts. But the upper and lower radiator hoses are the main hoses. Compared to other things, they are bigger and wider.

Bypass System

When the coolant in the engine is hot enough to open the thermostat, this part goes to work. So, it lets the coolant go around the radiator and go straight back to the engine, balancing the temperature of the coolant. Some manufacturers use a fixed steel tube, but rubber hoses are often used.

Cylinder Head Gaskets and Intake Manifold Gaskets:

This part also helps the cooling system of the engine because it keeps the surfaces of the combustion chamber from moving around. It makes sure that coolant and oil don’t leak out of or into the engine. Even though the surfaces that fit together are tight and precisely machined, coolant can still flow through it. Because of this, the gaskets are used.

Freeze Plugs

This part of the engine is made by mixing special sand with metal that is still hot. It took the shape of the holes in the engine block where coolant flows. Since coolant flows through the part, the hole must be sealed or the coolant will just pour out.

Most of the parts of the cooling system have been talked about in-depth in a new post. You should look at them to make sure you understand them well.

Read More: Led vs Halogen Headlights

Types of Engine Cooling System

Air Cooling System

In air types of cooling systems, heat from the outside of the engine is reflected by the flow of air and carried away. This airflow comes from the air around us, and the fins effectively direct it to the engine parts. The fins are made of ridges of metal, and the size of those ridges determines how much heat will be blown out during the process.

The air cooling system depends on how big the fins are, how fast the cooling air is moving, and how hot the fins and cooling air are. The cooling system works well for less powerful tractors, scooters, motorcycles, small planes, and small car engines. Small industrial engines can also be made with cooling systems that use air.

Air cooling system has these pros:

  • It costs less to make the system.
  • It weighs less because there are no water jackets, radiators, circulating pumps, or water in the design.
  • Less requirement for maintenance.
  • There won’t be any risk of damage from frost, like cracks in the cylinder jackets or leaks in the radiator water tube.
  • Less work goes into air-cooled engines.

Water Cooling System

So far, we’ve talked about cooling systems that use water because they are often found in car engines. Well, they do two things for an engine: they get rid of extra heat and keep the engine from getting too hot. Also, it keeps the engine at a good temperature for working and saves money.

There are four different kinds of water cooling systems, which are:

  • A system with or without a return
  • The Thermo-Syphon System
  • Hopper System
  • Pump and Forced Circulation System

What happens if your car runs out of engine coolant?

If you run the engine without coolant for a long time, it will be seriously damaged. The heads and head gaskets are often one of the first things to break. If you really push it, you could damage the block, lock up the engine, or melt a hole in a piston.

There are some telltale signs that you’ve run out of coolant before the damage gets too bad.

  1. The heater breaks down
  2. The temperature gauge goes from hot to cold because it’s no longer in the hot coolant.
  3. If the cooling system isn’t doing its job, the engine heats up, and the heat gauge keeps going up and into the “hot” zone.
  4. At this point, the engine is running hotter than it was designed to, and the check engine light may turn on. You may have already hurt the heads or gaskets at this point.

After warning number 2, you should turn off the engine and let it cool down. Putting cool water into a hot engine could cause it to warp or crack. Also, you might get burned when you open the cap.

Causes of Engine Overheating

A car can get too hot for a number of reasons. The engine cooling system of a typical car has four main parts: the water pump, the radiator, the heater core, and the thermostat. All of these parts are connected by hoses. If any of these parts break, the cooling system won’t work right, which can cause a lot of damage.

If there is good news, it is that an overheating problem is probably caused by a broken coolant hose. When this happens, the coolant can leak out quickly, which can cause the car to overheat quickly. This is an easy and cheap problem to fix as long as you pull over and stop driving the car right away.

On the other hand, it costs more to fix a broken water pump or a problem with the radiator. The cooling fan, which is sometimes powered by the engine and sometimes by electricity, is another thing that could go wrong. The fan belt can break on engine-driven fans, which is another problem that can be fixed for a low cost.

You should never drive a car that is too hot. This is the most important thing to remember. If your car starts to overheat, pull over somewhere safe away from traffic and give it enough time to cool down before you try to check it out and fix it.


Keeping your car’s engine clean is a great thing to put on your list of things to do to take care of your car. You might want to wait until your service, but service might not include cleaning.

Even though they will check and fill all of your fluids, like windshield washer fluid, brake fluid, and engine coolant, they won’t clean anything in your engine. This means that it is up to you to make sure they are working with clean parts and can easily spot any problems.

Service your car at least once a year. How often you should service your car depends on how much you drive, where you live, and how to cool down a car engine quickly in general. If you start having problems, hear strange noises, or feel like it’s not working well, it’s best to get it checked out as soon as possible.

Frequently Asked Questions (FAQs) How to Cool Down a Car Engine Quickly

Can I cool down a car engine quickly by pouring water on it?

No, pouring water, especially cold water, on your engine block can cause it to crack and cause other problems because of the sudden change in temperature.

Can an engine handle get too hot?

Can an engine handle get too hot? A car engine can keep running even if it gets too hot, as long as the car isn’t driven until the engine completely breaks down. The longer you drive a car that is too hot, the more likely it is that you will hurt yourself or someone else.

Can I put water in my radiator?

Water should only be put in the radiator in an emergency. If it’s really low or empty, you need to put more fluid in your car. Adding a 50/50 mix of coolant and water or a pre-mixed coolant is best, but if you have to keep driving, you can add water to the radiator to get you there.

Can low oil cause overheat?

Low coolant is usually easy to spot, but low oil can also cause the engine to get too hot. Even if your coolant level is fine, this can happen. If there isn’t enough oil in the engine, it will keep getting hot because it can’t cool down.

Can I drive my car if it’s overheating?

Driving your car when it’s too hot can cause serious and sometimes permanent damage to your engine, so it’s best to stop as soon as possible. Shop where you won’t be hit by other cars, and then turn off the engine.

At what temperature is it safe to open the radiator cap?

Once a radiator cap has cooled to 100 degrees Fahrenheit or less, it is safe to touch and move it.

Does oil cool the engine?

Everyone knows it makes things smooth. It also cleans, stops rust, and keeps things cool. And this is something that many people don’t think about. But oil is a very important part of cooling any engine. This is especially true for engines that use air to cool.

Does the radiator cool your oil?

In this system, cooled coolant is pumped to the oil filter housing to lower the temperature of the oil at the oil filter housing. Another is a return line from the radiator that goes to an air-cooled radiator in front of the radiator that cools the engine coolant. This can cool the oil even more.

How long does it take for coolant to work in a car?

Once you put coolant in your car, it will take between one and two hours to control the temperature of your engine.

How far can you drive an overheating car?

There is always a way to do something, but experts say that you shouldn’t drive more than a quarter of a mile in a car that is too hot.

How long does an overheated cool down a car engine quickly?

30 minutes. Normally, it takes at least 30 minutes for an overheated engine to cool down to a safe temperature so that it can be looked at and possibly fixed.

How long should you wait if your car overheats?

Wait at least 30 minutes for the engine to cool all the way down. If you can pop the hood with a latch inside the car, you might be able to speed up the cooling process. But don’t touch the hood or try to open it until the engine is totally cool. Check the reservoir for the coolant or antifreeze.

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