Water (antifreeze) takes TIME to absorb heat from the engine. If you don't have a thermostat in, the water flows too fast to absorb the heat that the engine creates when running while going down the road. Try boiling water on your stove, and see how long it takes from cold water to boiling water. It takes MINUTES, not seconds. The antifreeze needs to stay in the engine for a period of time to absorb the heat from the engine block and cylinder heads to do what it needs to do.
@@shahrozalijafri8816 yes and it runs cold for way too long. Your injection system is also putting enriched mixture. This will prematurely wear out your engine rings. Wastes gas too. just all around not a good idea! had a car with no thermostat running through the desert in high heat also overheat.
@@shahrozalijafri8816 so what about engine wear ?????? IF you run with no thermostat you will pay the price!!!! No BS here Try driving it hard up the hill from vegas to baker with your foot in it. on a 115 day.....YOU WILL BE THE ONE SCHOOLED.....
I had a 95 v6 mustang with a rebuilt engine that ran super hot, had to run with heater on to keep from going into the red. Took the thermostat out, no problem.✅
replace the radiator and put the thermostat back in. you should be good. Restricted radiator will cause that issue. you need the thermostat to keep the engine from running too cool.
This guy's full of s*** just like all the rest I ran all my cars with no thermostat and they ran cooler I love it when people say the coolant isn't in the radiator long enough to cool well if that's the case the coolant isn't in the engine block long enough to get hot he says running the engine to cool is bad for the motor from what I remember from my 40 years of experience heat is an engine's worst enemy 40s 50s 60s 70s and some early 80s cars you can run without a thermostat carbureted cars are a lot easier than fuel injected cars
alright just say that after driving through the desert at 115 degrees. you will get schooled real quick. Our old 70s car would run so hot. without a thermostat through the desert. then we put it back in there and it ran perfect again. As soon as you would stop to get fuel it would boil over. I guarantee you your not smarter than the engineer who designed the car with the thermostat. There is a reason
@@mikesrandomvideos Auto engineers are stupid and paid for by Big Oil. Example; they unnecessarily put catalytic converters to burn excess, wasted fuel. This would not would not be needed if they would just engineer the carburation to properly burn fuel and not waste it out the tail pipe. Sloppy engineering, purposely done, $$, on their part. They don't want us to get good MPG.
Not good for any engine. either runs too hot or too cold. they probably had one get stuck and didnt have the money to replace it. But no thermostat is not a way to make your engine run cooler. The heat never can be properly absorbed into the coolant if it is not regulated. Then released into the air from the radiator.
I have a old car and my head gasket got blown. The coolant was boiling in the reservoir. My mechanic told me that it's summer so we can remove the thermostat if you don't wanna fix the head. Ny car has 250k km on it. So i don't wanna spend anymore. So can i run without the thermostat?
A damaged engine head gasket will destroy your engine. If you remove your thermostat will also destroy your engine too. Don't destroy your vehicle too soon
Blown head gasket hear too , even tried first step of blue devil sealant , tried to let it run for 50 min only made it to like 35 min then car started smoking I just turned it off 😢
I’m a taxi driver in South Africa, the vehicle I’m driving has a 2.7L petrol engine. A couple of years back, the thermostat was removed because the engine was overheating, now what it does is it will run at normal temperature until I start driving then it drops all the way down to completely cold and will even increase rev like a cold start
my dad own 4 toyotas, the oldest is a 1998 corrolla and from brand new, he took out the thermostat, he passed down the corolla to me and not once have i ever had an engine overheating, all the toyotas at home dont have thermostat.
Not true i delete lot of thermostat and the engine runs cooler but you have to put the fans working with a swith to controller or put it to a ignition wire to always runs the fans
could i replace my thermostat and thermostat housing with a tap with an actuator controlled by my ecu though? im planning on fabricating an intake manifold for a 2001 6g74 sohc pajero and the thermostat housing and coolant piping is the hurdle I don't have enough experience to jump solo yet
I dont think it needs to be that complicated thermostats work just fine mechanically they just should be replaced every 60k miles or so just as a maintenance.
In my 30 years of working on cars with my father (RIP)... I can't recall a single time when an engine has overheated due to the removal of thermostat... Without a thermostat the engine will run cooler and you'll get no heat in the winter seasons... The only time I've seen an engine over heat without a thermostat, because of a coolant leak, or the cooling fan malfunctioned... If and when your thermostat fails to open, your waters hose WILL burst, and depending on the type of engine, yours heads will warp, separating from the engine block causing oil and antifreeze to mx, requiring a rebuild or the junk yard, gaskets and freeze plugs may need replacing.... With or without a thermostat, the front of the engine will always be a few degrees cooler than the rear... for the simple fact, the cooling fan(s) and air flow blows over the front of the engine while driving... Engine heat, and coolant aren't the same temp... The peak temperature of the burning fuel inside the combustion chamber is on the order of 5,000 degrees Fahrenheit, but this temperature exist for only a few degrees and quickly falls. By the time the exhaust valve(s) opens, the temperature has fallen to less than 2000 degrees F. The temperature of the exhaust gas as it leaves the engine and enters the catalytic converter is on the order of 1600 degrees F. All of these temperatures are at peak power... My dad ran a 65 Chevy Impala no thermostat up until mid 90's until someone stole it, it ran fine, we froze our asses off in winter time... No saying don't run with one... But I don't recall my Dads car overheating. My 04 jeep has no T-stat going on 10 years, no issues.
Smell boooboo, live in vegas, always have my cars without thermostat, no problems what so ever, some restrictions apply 😅on some vehicles thermostat redirect s the flow so in such cases thermostat is needed
and in the winter your ruining your bottom end and rings. The oil does not lubricate properly when the temp is too low. Try driving it to Laughlin at 115 then make that comment.
@@adrianmorita2012 in these winter months. the engine damage caused by running too cold is really not good for the engine. Not hard change the thermostat every few years and better for the life of the engine. Lots of premature wear to the rings from too cold. Fuel will settle in the rings and wear them out much faster. If the car is injected your also getting worse gas mileage. because the temp sensor is putting enriched mixture in the cylinders. This causes the wear.
Been running my 2.5 ford ranger for two years or more without a thermostat and it does run very cold all the time highway interstate doing 80mph or idling. I thought that was great so I left it out. But I have to admit It does seem like the truck is lacking power year over year. Never thought it could be this. Lol. Probably gunna try to put it back in soon
Thank you excellent video my car runs all the time, 63 ford inline 200, can’t seem to g get it to run cool changed out water pump radiator , put fans on radiator nothing is working right !!
Probably excessive rust in the block. old Ford 200s had issues. and always ran hot. It is a F word issue. you can put all the cooling on there and have thermostats and everything. and chances are it will run hot. they had issues with block design...so anything remotely wrong it would keep getting hot. make sure you are running 50/50 never run straight coolant.
sometimes when you have no thermostat the coolant will go too fast through the engine and the heat may not transfer to the coolant. your gauge may read engine is not hot but the engine is hot and coolant temperature is not hot.
Modern radiators are made of aluminum. Engine blocks are usually iron, but sometimes aluminum. Aluminum thermal transfer rate is 3 times higher than iron. How would the coolant that you say is moving too fast to transfer heat to the radiator, be somehow still able to transfer heat from the engine block in the first place? WHAT exactly is heating up the coolant, if not heat from the engine block? And if the engine can GIVE that much heat to the coolant, then the coolant can GIVE that much heat to the radiator. It's a closed loop, lol One cannot happen without the other.
@@AmericanThunder If the flow too fast, it won't have enough time for both to pick heat up from engine nor have time to cool their way out in radiator.
@@MRsickcat84 since the 1970s I've noticed that when a thermostat is stuck shut and I need to quickly get the car running quickly, I remove the thermostat, silicone the housing back on and run it. They always run cold until a new thermostat is put in to bring it back up to operating temperature. In the last 45 years of working on cars that's probably happened two or three dozen times, all with the exact same results.
There are 2 types of thermostat. One type is only control the flow to the radiator (this is when the engine has small bypass line to water pump suction). This type probably okay to remove the thernostat in emergency situation. There is another type is where the thermostat acting as double valves where the thernostat will close the the bypass to water pump and open the line to the radiator. In this case removing the thermostat is actually harming the engine. . The engine for this type has a big bypass line to the suction of the water pump. When the thermostat is removed, all the hot water will be sucked by the pump and very little to radiator. Infact it will makenthe system becomes hotter. I just worked with car engine that has big bypass line to the pump suction. Cheers from Indonesia.
Really good point those bypass systems are totally dependent on the thermostat being there. In most circumstances it is much better to have the thermostat. better for engine wear.
May have been mentioned already but in my experience removing the t-stat even temporarily required a certain gasket to be used in place of it or the connection will leak water very badly.
Something everyone needs to understand is a cooler thermostat isn't always better. If you're engine never reaches the cool threshold of the thermostat it'll always circulate coolent which can actually make your car run hotter for reasons explained in the video. Basically it's the same as it being stuck open cuz it'll never close. Put a 160° on my 6.1 hemi and it ran 15° hotter than OEM 203° thermostat cuz the factory cooling system couldn't keep up so I went back. Most modern cars match the thermostat to the capabilities of the cooling system so changing it can be counterproductive and over tax the cooling system not giving the radiator enough time to cool Even if it does make the engine cooler if it never reaches the thermostats rating your over taxing the cooling system cuz it's always circulating, radiator just happens to cool very well but it'll shorten its efficiency over time cuz it's literally always circulating and it's designed to circulate in bursts
Great video Sir. I very respectfully wish to ask a question. I have a 1995 chevy 5.7 liter. It was recently overcooling-So i picked up a 195 thermostat. When installed the vehicles the vehicles temperature climbed up to 240 before the new thermostat opened and brought the vehicle down to around 190. I did bleed the system prior to driving. My very respectful question is; did i possibly purchase a bad thermostat? Or would it help to run a 180 degree instead? Thank you for your time Sir. Have a great day
sometimes they have an air pocket somewhere that you could not get out then it finally gets out of there. Even if you run without the cap for a while. Keep an eye on it and see. probably just fine just had some air in there you could not get out until it boiled.a bit. Check the coolant level again after driving a short bit and letting it cool.
Already then I got one question, comma what is the ideal operating temperature of internal combustion 4 cylinder 2.2 l Chevy S10 ? Because when they take all the speck ratings it's at a 150ﾟF My S10 is slightly modified with Bolt on like 3 core radiator
lol no, they don't. I haven't had a thermostat in the 332" stroker motor that I built 23 years ago, and it's still running the same. I took the thermostat out, punched the guts out of the middle, and re-installed it. The engine begins moving the temp needle in a minute or less. 30 seconds later, it begins getting warm air from the heater, coolant temp varies from 170-190F, depending on throttle. Obviously, if I'm shifting at 8500 rpm, temp goes up a bit to 190, but then drops back again. In one of my videos, it shows the temp gauge rapidly rising after a cold start. 500+ horsepower puts off a lot of BTU.
While I agree that there aren't very many reasons to ever run an engine without a thermostat, some of this information is flawed. Coolant doesn't need to stop or slow down in the radiator in order to dissipate heat. This is the way a sort of "buffer" is built, so you essentially have a reservoir of cooled water for when you have short bursts of load, like while accelerating, so your engine temp will remain steady, but it will eventually begin heating up if the cooling system isn't up to par. In fact, the faster it flows the more it will dissipate, up to a certain point. So in the same situation, if you ran with no thermostat, you'd be running at a lower temp to begin with, but instead of that buffer being inside the radiator per say, it's the entire system, so under hard acceleration, the entire engine temp will begin to raise slowly, and eventually would overheat in the same manner a system with a thermostat would, it just may take a little longer since the entire system has to heat up.
When you drive on the freeway on over 100 degree days the engine will get hotter and hotter and eventually overheat long trips through the desert especially. Have seen this many times. Cars came in the shop with this problem. Also the oil temp being too low most of the time will cause excessive wear to the engine bearings and rings etc. Not good to run without thermostat.
@@mikesrandomvideos if you're overheating without a thermostat, it would still overheat with one. All they do is allow quicker warm up and set a minimum temperature for the engine to run. Yes, it is bad to run without a thermostat due to increased wear, but it won't cause you to overheat any more than if you are running one.
@@CarsonC5 All I need to say is Take your thermostat out and drive on a long drive through the desert on a over 100 degree day....you will get schooled. I am a retired ASE master auto tech. I saw this many times in the shop. guys had a stuck therm. took it out and had different problems. Yes I am right. I am not sure your experience with this but I am well experienced. many cars. over several years.
@@mikesrandomvideos sir I have an 1999 Ford Taurus 3.0 LX and I have replaced the whole cooling system from water pump to all the hoses and it still runs hot I’m beating my head on the wall trying to figure out what the problem is and no it’s not a blown head gasket and I’m thinking about running the car without a Thermostat
whole cooling system.....have you replaced the radiator. Something is wrong if it is overheating. Fans working? do they cycle on and off. Work with the AC on and off. Water pump impeller spinning on the shaft? You really need to diagnosis the problem. Check to see if the coolant is flowing through the radiator, Make sure the coolant is 50/50 water. If it is straight coolant it will run hot. sometimes You can get a bad thermostat right out of the box. make sure you get all the air out too. should cycle. check temp at top of radiator and bottom. make sure it hot at the top and cool at the bottom. You can just feel the hoses. Thermostat must be there and working for car to run properly. On that year car it should trigger a CEL if the therm is out too.
bad for engine wear. and on long road trips in extreme heat will run hotter than with a thermostat. Running too cold for too long is not good for the engine.
What can be the cause when your car idles at a higher temperature then normal? Usually it idles somewhere before the half mark on de temp meter, mine idles a bit past half, can also feel the heat of the engine. Doesn't overheat though, just stays there. Any suggestions?
@@mikesrandomvideos The car doesnt have a thermostatz previous owner removed it for some reason The problem is that the car sometimes turns off when I drive a long distance or with AC on
@@ANIL933 well it needs a thermostat. and need to be working properly. Put one back in there. if the car turns off it must be either ignition or fuel shutting off. Possibly a relay is getting hot and shutting off. That would be my best guess. I would have someone put their hand over the relays and see which ones click when you turn on the key. Replace that relay. with the AC on could put extra stress on that relay. My best guess without looking at the car and knowing YMM...
i have a 2008 kia spectra, the car overheats only when im driving fro 20 min and it overheat faster when im going up the hill but when i stop the car the temperature came back to normal. any suggestions?
Have you checked the condition of the coolant ? If you got a gray-blackish color to it the headgasket is blown and needs to be replaced if it is not the headgasket, the thermostat could be stuck closed and not open you can test the thermostat by removing it and put it in a cooking pot filled with water and boil the water and watch if the thermostat will open if it does then clean out the radiator cooling finns because they will get plugged overtime if isn't the problem or you cleaned through the radiator and the problem occurs, then you might have a bad water pump
When it reaches a certain temp between 180-195, the spring expands and opens the top portion allowing coolant to flow thru. Below 180 degrees and it remains shut. You can test if a t-stat is faulty by boiling water to that temp and dropping the t-stat in the boiling water. If it opens at those temps then it’s good, if not then replace
In hot States, in the South, for example, where I live, is it harmful to put in a lower temperature rated thermostat to help the motor run a bit cooler? I think it's a 170F rated thermostat I put in my 84 Mazda B2000; the original one was rated at a higher temperature than that, (180F?). No AC in this truck, 2.0L engine. Temp gauge on dash, if accurate, always runs very low. Thanks.
Engines run more efficiently at higher temps. Ideal range from 190-220 is considered the safe range. I had a 98 V6 ranger. Thermostat starting going out. We replaced the thermostat with the stock ford 192 F or whatever thermostat and never had a problem (I live in NC, temps get up to like 100F with 60% humidity). If the temp gauge is low I would run the 190. Low temps can cause premature wear, carbon deposits on the piston which could lead to detonation, and worse gas mileage
@@steveandrews8301 Modern cars now sit somewhere around 200-210 from what Im seeing. Honestly though Im primarily a forklift tech and work on old cars from time to time so may info my be a little off. Once you start pushing 230 degrees it could start causing problems but 220 and below is considered safe. Interesting tidbit is that engines seem to produce more power at temps around 190. Whether that's due to thinner oil viscosity, metal expanding, higher combustion chamber temps, etc I could not tell you haha. I just spend way too much time researching every little detail about every component on my mustang
@@Boberation Well, with a chain saw that has shot piston rings, cylinder compression goes down when in use and warms up - to the point it just stops running and won’t restart, if at all, till it cools down completely.
not just the radiator it is also the block. the coolant is not going slow enough to transfer the heat to the radiator. Yes it is not a myth. it is science and it is really important. had several cars with no therm and major issues.
@@mikesrandomvideos its been a month and I took the thermostat off my corolla and even if drive at the redline the car never gets to operating temperature and runs way way cooler, you never owned or driven a car without a thermostat have you
@@shahrozalijafri8816 look take it out when it is over 100 degrees put on the air conditioner. drive on the freeway through the desert. then tell me I dont know what I am talking about. I was a ASE master auto technician I worked on several cars without therms that all had issues. Also if your engine is not getting to operating temperature. Your OIL is not properly lubricating the parts. And you are causing excessive wear to your bearings and rings valve guides etc..... YOU WILL GET SCHOOLED.....EVENTUALLY.
@@mikesrandomvideos you don’t know shit what you are talking about🤣🤣 it was like 36-37 degree Celsius like a week ago and I drove around in the city with my ac on and the temps take a lot longer to get up to operating temperature with the ac running from dead cold and lastly I took it on the motorway with the ac running and the temps dropped😂😂 below operating temperature I have had two cars prior whose thermostat failed and they never overheated they just either took long to get upto temperature or they dropped temps with ac running or when they were on the motorway where I live it never cold enough to use the heater so driving without them is fine
