How Engine Cooling Systems Work (Animation)

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This 3D animated video shows how an engine cooling water system works. We look at all the main components of the cooling water system, how it operates, how the thermostat works, why the engine is dosed with anti-freeze and why we use corrosion inhibitors.
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▶️Introduction
Internal combustion (IC) engines generate a lot of heat when operating. In order to prevent the engine seizing, it is necessary to remove the heat. The job of the cooling water system is not to continually cool the engine, the job of the cooling water system is to regulate the engine temperature in order to maintain the optimum operational temperature.
Note that we refer to the cooling water system in the video, but we could also be referring to a jacket cooling water system, the terms are interchangeable.
Operation
Cooling water is circulated through the engine by a cooling water pump. The pump is driven from the crankshaft via a belt, chain or gear. When the engine is cold, the cooling water is recirculated and bypasses the radiator. When the engine is hot, cooling water is sent to the radiator to be cooled. The thermostat regulates the flow to the radiator, or flow bypassing the radiator. Typically the thermostat will be set to maintain a cooling water temperature of approximately 80 degrees Celsius.
Thermostat
The engine thermostat consists of a rod, several springs, primary valve (main valve), secondary valve (bypass valve) and a charge cylinder. The charge cylinder is full of a wax with a melting point of approximately 80 degrees Celsius. When the cooling water exceeds 80 degrees Celsius, the wax melts and becomes liquid. The liquid wax is larger in volume compared to when the wax is in a solid state. A rod inserted into the charge cylinder is pushed out of the cylinder due to the expansion of the wax. The rod pushes the bypass valve linearly away from the thermostat body and thus closes the bypass valve. At the same time, the main valve is opened and cooling water is sent to the radiator.
The thermostat is a proportional response device and opens/closes proportionally depending upon the engine cooling water temperature.
Ant-Freeze
Anti-freeze is added to the cooling water in order to prevent the water freezing in sub-zero conditions. Freezing of the cooling water leads to expansion of the water and this could potentially damage engine components such as the cylinder block.
Corrosion Inhibitors
Corrosion inhibitors are added in order to prevent rust accumulation on the internal surfaces of the cooling water system components and to keep the heat transfer surfaces clean.
#saVRee #Automotive #IndustrialEngineering

[@savree-3d]

Want to continue learning about engineering with videos like this one? Then visit: courses.savree.com/ Want to teach/instruct with the 3D models shown in this video? Then visit: savree.com/en

[@B3engMarine]

I am so happy someones explain these with such detail.I am a seaman and 99% of the time nobody wants to explain you anything...You ask for help and there are 2 reactions:Yelling to you and saying to go find it youself or How the heck you dont know about this.Wish i had someone like you onboard.

[@LosBerkos]

It's horrible working in an environment like that if the others don't take pride in being part of the same crew.

[@R3vokenDallout1on]

I know your pain

[@capoleader3793]

This was by far the best and easiest explanation on how a coolant system operates! 👍🏻

[@savree-3d]

Great to hear!

[@nadahb979]

I'm so thankful for this man he detailed every single thing I had questions about and his way of talking "slowly" makes the explanation better

[@phongvo8357]

Thank you so much for making such an incredible 3-D video. I am taking a smog inspector license and your video helps me to visualize and understand my coolant system chapter much better. Please keep up your good work and hope you can have more videos of the exhaust and fuel system.

[@Mo4creed]

Best explanation on how cooling system works! the 3D animation helped tremendously. Thank you !

[@NickP0811]

Best description by far, so far, on this topic! Well done!

[@abhaygulati6514]

Thank you so much this video literally explains my whole coursework. For future videos could you cover the fuel side of a engine?

[@onicejade2010]

Great animation, awesome explanation. Thanks for sharing your knowledge and experience.

[@turanquliyev3000]

Very Very good video man! Thank you so much.You are teaching us without requiring any money. Thanks a lot!!

[@POPO-kg1nf]

as a Novice couldn't understand any other 2D or just explanation videos, but this one helped me a lot to understand. Thank you very much SIR.

[@samng6540]

The best explaination so far! Thanks for your video.

[@rosliroslan1452]

Excellent!!!!!!

[@mostafael-abboubi4638]

An outstanding video, thank you so much for all these clarifications

[@mohamedkhalid7708]

My car coolant pump broke down yesterday and replaced new one today. You video helped me understand the whole thing works, It was a truly very helpful video. Manny many thanks and God bless you.

[@savree-3d]

Great to hear!

[@mohamedk.haddar3225]

Beautifully and simply explained, thank you sir!

[@ravipateluk]

Very well explained...you should have included heating core part as well...nice video

[@chrispitchford6045]

I'm a non engineer. This video provided me with the understanding of a diesels cooling system. Very clear explanation. Thanks for the help!

[@savree-3d]

Glad it helped

[@OKAZWA44]

Well done Sir , concise . clear, easy to understand and to the point thanks and God bless you

[@145broshan]

Amazing video, thanks for the help!

[@mumtazawan1421]

Briefing excellently. Thank you 😊 💓

[@DrZygote214]

Savree is a rly good channel and im rly glad i found it.

[@adolphuslewisiv1158]

Awesome Video, i need to replace my coolant heat storage tank in my car which i didn't know it's purpose until now. Thank you!

[@rengarajanrengarajan6021]

Great, clear explanation

[@zanedavids4141]

Thanx that was a good quick and very insightful course .

[@mohdzamreeabdul3935]

Very² good explanation.. many thanks for the informative video...!

[@damariussweeting900]

Yes Sir that was a good video can be used by University as reference videos thankyou good work and I hope you make some money

[@shiv7573]

Thanks so much for such a wonderful video.

[@vijaypandey4463]

Nicely explained. Well done. 👍

[@harrisonteodosio1903]

Thank you for this very informative video

[@thedeal9526]

Excellent presentation!

[@brunab.1145]

It was a great video, congrats!!!

[@AutomotivQueen]

great presentation there,learnt a lot,Please add at least some if not all causes of overheating in an engine on another video

[@mohamedsalahmoghazy4062]

Great Detailed Video Thanks a lot

[@soroushchabavi4230]

this is AMAZING

[@liangpeng9511]

Fantastic video! Thanks for the excellent explanation.

[@savree-3d]

Glad you enjoyed it!

[@harshilmistry0709]

Great explanation sir

[@b.altorany791]

Thank you thank you thank you so much you are awsome very professionally Explained and I learned a lot from you Please I support you and encourage you to do videos like that and do not stop

[@bornfree8073]

@@savree-3d do one for a tractor. The thermostats are on a different spot

[@iitanand757]

Simply Superb - Thanks a lot

[@Voltage06888]

Great stuff man!!

[@shubhamupman7260]

Thank you soo much great video!!

[@irajnoormanesh9805]

thank you very much it was very useful

[@maisaralifeschool]

very nice and detailed thank you

[@biruhtesfa8448]

Thank you sir!

[@faisalov9206]

honestly IDK how this channel hasn't reached a million subscriber yet!! mate the work you do is incredible, please keep going coz I learnt a lot from you. Thank you is not enough.

[@savree-3d]

Wow, thank you! Will keep doing what we are doing. Glad you like the videos, means a lot.

[@nashwanalaswadi3421]

Sir I need someone to write

[@rodneynicholls6537]

well explained

[@markschweitzer661]

Well done.

[@getachewchala2778]

lam so happy more explain thanks guys

[@nevilson7574]

Actually this is good work and amazing I can learn lot of things easy keep going which wonderful job I should follow you I will share this to more People then it's very worthfull to me and thank you is not enough 👍👍👍👍👍👍👍

[@madhusankawijerathne8435]

Thank you sir

[@jamesblack6227]

Excellent video!

[@admiretakaedza3245]

Very much appreciated

[@ghfhdhshah]

Thanks for the great explanation. I guess the hotter the wax, the bigger the volume, but what controls how wide the thermostat valve opens?

[@TimeLapsesBaudet]

Gracias!

[@anulalnhattela991]

Excellent 👌

[@mcmk1999]

thank you

[@travsformation1]

Great video and excellent explanations! I actually stumbled upon this video trying to understand how the system would operate in instances of hot coolant and a cold engine. I'll elaborate: I have a campervan that, as a hot water heater (dishes, showers) heats the coolant to 90°C. Cold water flows from the water tank and passes through a heat exchange in thy engine bay, where it warms up thanks to the hot coolant. Does this have any positive effect in terms of cold starts? The thermostat is dependant on the temperature of the coolant EXITING the engine right? So unless the engine is hot, the circuit bypasses the radiator? So... No benefit? When it's been in operation for a while and I start the engine, the vehicle indicates that the temperature is about 45° (half way to 90°, with an outdoor temperature of maybe 0-5°C). I'm not sure how this occurs... What am I missing?

[@mohandkhader3581]

great explainging

[@diegofeliperuizjurado8111]

Muy bien!

[@papacaleb8136]

nice work

[@jessietanzo6195]

Hi sir the video is cool and informative, but i think the radiator fun animation direction is going to the engine side. Pulling the air, not pushing.

[@sureshvamsy2569]

Nice bro

[@DavidLeeEDHSAutoTech]

Good video. Good animations. Only thing, the fan pulls air that is coming through the car's grill. If the fan was pushing, the air being pushed forward would meet the air being rammed in through the grill and radiator and may not cool the engine properly.

[@shiv7573]

Exactly . I too got the same doubt

[@ghoshae478]

Thank you

[@savree-3d]

You're welcome

[@jquiznos2283]

Wish this existed when I was a young man in High School and went to Auto Shop.

[@SudhirKumar-db4ti]

Good video

[@dse2008]

from hong kong, very nice video

[@savree-3d]

Thanks! 😃 From Munich (soon to be Edinburgh).

[@kramyaj512]

Hi! A 1.5 inch long plastic thin tube fell inside my car's coolant reservoir tank. Is it safe to drive to my mechanic? If not, any ideas on how to remove it? Thanks in advanced!

[@leebreeze8919]

Good video 👍. What's is the lifetime of the thermostat? Thank you.

[@grantp4022]

Great video, and I do have a question ? Do the radiator fans blow air forward thru the rad, and outside, or do these rad fans "suck in" air thru the radiator, to cool the coolant, and then release the air under the hood. I always thought, they blew air forward thru the rad, and out the front, and then into the outside air, but after watching a couple videos, including yours, it appears these rad fans suck air in thru the rad, to cool the coolant. Could you please clarify this ?? - thanks, and great Video :)

[@GRMNMSCLE]

Yeah, all radiator fans pull air through the front to the back, as this is how air flows through them when driving forwards. It wouldn't make much sense to push air back to front through a radiator as it would be fighting a head wind in motion

[@NKaumans]

The fan does not blow air into the radiator, it sucks or draws air in. Some vehicles use a clutch fan such as in this animation while most use electric fans. Clutch fans can only draw air in as they are behind the radiator being driven off the belt

[@nguyentri1933]

May I ask you what was simulation software you use?

[@lolz616]

How does the engine seperate the coolant from mixing with the engine oil? does the coolant flow in a different area than the motor oil?

[@valjean2036]

Good ?

[@nowayjose596]

Yes, the coolant passages in the engine are separate from the oil passages.

[@LangsonFulayi]

Guys let's explore more and shade more light on this one. Research and send something on the group it will help as go deeper in how group. Mr fulayi minister, indeke iyendela pashi, good 9yt bane let's avoid sleeping Ely we are students I grt u all lesa atupale bose amen.

[@milhampratama6126]

Can the water in the expantion tank regulate back to the cooling system?

[@lllucky13]

One thing that isnt mentioned here is that when the engine cools down the coolant from the expansion tank goes back into the engine

[@faisalov9206]

that's what I thought.

[@mattsmith6828]

so does the coolant reservoir eventually get filled up and have to be manually removed?

[@eugenenazarenko9220]

Nope, when the engine cools down the coolant cools down too, therefore the coolant contracts. As it takes less volume, there is a slight vacuum that sucks coolant from the tank and back into the radiator

[@THEBILL1993]

so is there a pipe or something behind the engine that gets the coolant from one side to the other of the engine? there is arrows going around the cylinders but nothing showing how the coolant gets to where it is sucked out. are the cyclinders just in a bath of coolant?

[@Bendigo1]

There are channels inside the engine that coolant circulates through. Basically a bunch of tunnels for coolant to flow through.

[@roeldelrosario5189]

Where we can order a tube where termostat is installed, can we order to you

[@laibakhokhar9009]

HI, hope you are well nowadays. Can you tell me which type of software you are using? i

[@zokonjazokonja]

I newer seen system where fan blows through radiator, always suck through radiator and blowing in engine direction

[@sayassana33]

That's what I noticed as well because if the fan blows into the radiator then hot air from the engine and the components is gonna be pushed through and it's not gonna cool fast enough. Or maybe there are exceptions we don't know

[@wertigo7827]

Thats because its connected to camshaft, audi, bmw and merc have that system on some models.

[@usamajadoon352]

So whats the thermostat setting . How to adjust setting

[@stateboy80892]

Thermostat housing is located on lower radiator hose instead of the upper hose... Does it mean the upper hose is inlet to engine from radiator and the lower is exit from engine to radiator?!

[@giyudhkarlops9012]

Can u explain why air trapped in modern engine lead to over heating but not in old car?

[@deidsondjp]

Someone know the software that he used in this 3D simulation?

[@richardlindsay3958]

Love it!!! Except; the cooling fan pulls air towards the engine.

[@javierrojas8262]

Jaja

[@danielpolon9503]

Can the thermostat be removed, bypass one hose so all the water passes through the radiator?.

[@savree-3d]

You can, just means you lose the control to regulate the cooling water system temperature. With the setup you described, you would be cooling the cooling water at max, continuously, irrespective of the cooling water temperature.

[@ayoubpapiy6692]

Why the water is going to chamber tank every time? And water make full then the water disappear out.

[@engmohamedyusuf9222]

13 sep 2020 internal combustion engine this course is complicated

[@rachellyap8560]

can i know why need to be high boiling point?

[@thesilentgeneration1711]

If you have too low of a boiling point your coolant can boil and create air pockets in your cooling system thus reducing cooling efficiency and potentially blowing a hole in the cooling system and getting the engine to hot

[@joshwasimamora]

Is this Tyson Fury the Gypsy King speaking? 🤣

[@cesarpineda2696]

When to open thermostat

[@RoxusRemo]

When engine is up to temp.

[@moisespetalio3319]

Why oil trapped to water radiator systim , how couse

[@arlingtonpierre9371]

The coiling fan doesnt blow air against the radiator it pulls air away from it

[@Bendigo1]

It can be either way. It is most common to have a pull configuration but isn't always the case. The goal is to get air to move through the radiator fins to carry heat away.

[@brittanywright9646]

@@Bendigo1 assuming he's referring to the fan in the video, if the fan blew air, the goddamn engine would already be at 120c and either the head gasket is toast or, if the radiator is aluminum and plastic, the plastic ruptures expelling all the coolant.

[@Bendigo1]

@@brittanywright9646 If the vehicle was moving the direction opposite of the airflow it would not make sense to have the fan blowing air that way. But if it was stationary or moving with the direction the fan was blowing, it would still cool the coolant in the radiator, just not as fast as it would if it was pulling cooler air through from the front. There are actually quite a few cases where the fan blows air from the engine side out through the radiator. Air just needs to move through the radiator, it really doesn't matter too much which way it goes. It is just better for cooling to have cooler air going in one side. If it is really cold outside, it could be better to have the air blowing from the engine side.

[@brittanywright9646]

@@Bendigo1 Tell me when have you seen a fan mounted behind the radiator actually push air through the radiator? Are you just commenting just to post replies or what? If it's really cold outside it could be better to have air blowing from the engine side? How? If it's really cold outside, the fan wouldn't even be on. You aren't making any sense at all.

[@Bendigo1]

@@brittanywright9646 Many times actually. Heavy equipment often has fans that push air out instead of pulling air in. Sometimes they switch between pulling in or pushing out air. Most ICE forklifts push air out. In cold temperatures, air still needs to be circulated to cool the engine, pushing air from the engine compartment, while not commonly done, can help to keep the coolant at a more stable temperature instead of pulling extremely cold air through the radiator, you push the warmer air out of the engine compartment. You must not know much about engine cooling systems, or uses for them in anything other than standard road vehicles, or are thinking only about the standard cooling system in regular road vehicles.

[@fugitivemoses7515]

The organs of advanced life forms seems to be the inspiration behind the manner engines were designed to functions. Why then do we observe the organs/organelles of life forms and then attribute it's origins to a series of mindless, random, accidents? A person would be considered Mad and insane if they believed Engines were designed by random, uncontrolled accidents. And yet, when people suggest that our organs appear to be designed, they are considered to be the idiots... It's a crazy world.

[@migdolmielies]

The fan is pulling air toward the engine not away from the engine. Great video though

[@javierrojas8262]

Jaja

[@moisespetalio3319]

On my 4k ingine

[@nemipaka2319]

bandamax no entiendo la tarea

[@johntran7021]

nothing mention if USING WATER AS COOLANT....meaning adding water contanstanly everyday after few distance drive

[@Bendigo1]

Too much water in the mix lowers boiling point and raises freezing point, along with reducing how much heat the coolant absorbs, reducing cooling ability.

[@barekzayfamily9783]

Hello, it was first time, my car got overheated, it was because the wasn’t tightened I hope the engine is not damaged. ????

[@ChasinOneTwelve]

Did you get it fixed?