Is this normal for the coolant level to be at min? Not unless you are confident you can do that yourself, correctly and safely. Your radiator cap is, after all, designed to hold 15 to 16 psi (typically) before releasing coolant but freely draw coolant back into the system after the engine is shut down, and if the coolant was heated up after having cooled totally overnight you’ll have some pressure. I got a 2002 mustang v6 and I hadn’t flushed the coolant since 5 years ago so I decided to take off the radiator cap off too check the status of the coolant. I don’t think this is something to be concerned about. As will coolant. This is because the hoses expand slightly with normal running pressure. a pun). The outside of your coolant tank should have marking indicating the recommended level of coolant for proper function of your car. When checking my coolant reservoir on my 2018 Escape 1.5 I noticed the coolant was low, when I released the pressure cap the reservoir filled almost back to the correct level. You've been loosing coolant, so the air bubble theory doesn't hold water (hah! In fact a lot of radiators now don’t even have a cap anymore. As the pressure causes the coolant to get higher than the pressure cap, the excess coolant needs to be captured somewhere in order to prevent leakage. how do you release airlcok from the heatermatrix? Download this Cooling System Radiator With Cap Removed Showing Green Antifreeze Coolant Level Inside Concept Of Automotive And Lawn Equipment Maintenance And Repair photo now. Checking your car's engine coolant level regularly is important. When the coolant level gets too low, the electrodes are exposed to air, the circuit is broken, and the low coolant level warning light on the dashboard is triggered. Coolant level cold should be above the minimum. When the engine is cold, the coolant level should be between those marks. The first thing that you need to inspect is the coolant level sensor if your BMW has one. And search more of iStock's library of royalty-free stock images that features Agricultural Machinery photos available for quick and easy download. The engine temps were running normally on the run at … If still concerned, you could do a quick check for a head gasket problem. I have heard some say it's how some cars are. Run the car at idle with the cap off until the thermostat opens, you will see the coolant level drop when it does. To keep your cooling system cool, check the fluid level in the system and, if necessary, add water and coolant. I just got back from LA. Most cars these days have a translucent coolant overflow tank right next to the radiator. Paraoxically the hot level is different if you run engine until hot with radiator cap removed. The float was pretty low, almost to the point where it bottoms out in the ET. Now, turn on the car, during the engine running (about 10 minutes) kept check the level of coolant be sure it still maintains pass the full mark level. This car feels different. Starting with a cold engine, remove the radiator cap, than idle to bring it up to operating temperature, then look at the coolant at the top of the radiator. If so the coolant will drain down to the radiator and out the open cap. What causing this? Once the driver parks the vehicle and tur… But then even a short section of heater hose that is above the level of the cap will drain down and out. just released cap after todays drive and engine cooled down, same thing.. the level was minimum, released cap and pressure came out and rose back to Max... whats happening???? Reading your coolant level. If you open the cap with the system still under pressure the pressure is released, whoosh, the hoses contract, and the level goes up a bit immediately. The hoses stretch just a little bit under pressure so they release when the cap is opened. agreed, this no longer sounds like an air bubble etc and much more like a head gasket breach that is over-pressurizing your coolant system slightly under certain conditions. Now, fill coolant to the top and put a new cap back on. old cap wasnt holding pressure? It’s dangerous to remove the pressure cap from the radiator or coolant recovery system reservoir while the engine is still warm. No bubbles, unlikely to have a head gasket problem. If the level is low, ensure you don’t remove the radiator filler cap until the engine is cool – it usually takes a few hours after a drive. Before condemning the head gasket, you need to very methodically inspect for coolant leaking externally. Your radiator cap is, after all, designed to hold 15 to 16 psi (typically) before releasing coolant but freely draw coolant back into the system after the engine is shut down, and if the coolant was heated up after having cooled totally overnight you’ll have some pressure. It should just be a little though. Naturally if I put the thermostat bung back in the coolant level rises in the expansion tank, ... fill system completely ie thermostat plug removed and expansion cap till both overflow , then refit and go for a run,system needs only to overflow not run clear jamesmartin, Sep 3, 2016 #8. does that sound a possibilty. Opened my expansion tank to check coolant level and add water wetter, car was lukewarm after sitting for ~2 hours in the garage, small hiss. Next you can close your hood and confirm its latched. I did find this - Coolant goes down, triggers alert, but bubbles back up when cap is removed Maybe the OP @Ondro05 can give us an update. Put the cap back on the radiator and check the heater radiator, coolant, cars, level, trucks, suv, chevy, mechanic, hot, how to, how long to waitYou should put antifreeze—more appropriately known as coolant—into your car immediately. Because it’s hard to tell just how hot things are inside the engine, follow […] Water will seek its level. The level is above max when hot. Thanks for the help man I’ll sure do the head gasket test when I get my car back from my brother since he’s borrowing it for a week. What could be causing this to happen? As I took the cap off, coolant started to slowly spill out of it so I quickly put the cap right on. Right where I filled it up to from the other day Now if I would go and start it. Most likely the coolant is leaking under pressure when the engine is operating. Just checked the coolant level before I went to work this morning and it was fine. You'll also see markings on the side telling you the low and high levels to work with. It is possible to get a Coolant Level too Low warning still even if you add coolant. It only overflows for a few seconds, then stops, right? If the motor is very hot when the radiator cap is removed, some flash boiling should be expected. See any bubbles coming up? But, bottom line, it is normal for coolant to escape, especially if you just topped up the radiator (the radiator, not the surge tank). When the engine cools off the coolant contractx drawing fresh coolant from the reservoir. It's when it's disapearing you need to find why very quickly! I have not had a warning even when at min. Check out the Drive’s Garage Guide for detailed instructions to check your coolant level. Once the coolant reservoir tank is filled to the maximum level line you can reinstall the cap (clockwise) until you hear or feel the click. then had to release cap to let water rise bakc but a bit of water did get lost, Read similar threads on other forums and similar issues are pointing at headgasket or airlock in heater matrix? I set mine between max and min lines. If your car’s coolant levels are near or below min, it may be wise for you to add more coolant. (The surge tank usually doesn't have a pressure regulating cap.) And as this happens it fills the radiator right to the brim. More likely to happen in certain situations I expect, depends on the temp of the coolant in the radiator, and if the car is parked on a slope or not. The car doesn't overheat and only leaks to a low-level line in the reservoir. We recommend keeping some coolant in the trunk in case you need to top off the coolant … I ran the car today with the cap off 1.5k revs until reached 90. As the engine cools while parking the car overnight, the coolant in the overflow tank gets sucked back into the top of the radiator. You must log in or register to reply here. The important thing it, if the coolant is at the seam when it was cold, then after getting hot and cooling again it's still at the seam, it's fine. They piddle a little coolant when the cap is opened. for a week the level of coolant has remained steady just above max line. went to start car, light came on for coolant check. Please help btw coolant is still green. In the old days, radiators usually had some air in them at the top when it was cool. If the cap is off, slightly it doesn't leak coolant at all. Some cardboard or newspaper can work for a collection zone. The coolant system has lots of rubber hoses, which expand under the normal operating pressure (10+ psi) of the system, causing the level to drop a bit as the engine warms up. Hi all just after bit of advise after replacing coolant cap... and thats the first time ive taken the new cap off after a drive so i'm hoping the new cap has done something ? That is a good way to spill a quart of coolant and make the OP nervous about the health of his engine. So I’m guessing I shouldn’t be checking for bubbles? Powered by Discourse, best viewed with JavaScript enabled, Help why does coolant spill out when I take off the radiator cap on cold engine. I am not new to VAG or Skoda. On the other hand, if coolant is disappearing (and the surge tank keeps going empty), that indicates a coolant … Not only does it keep your engine cool and protect it from overheating, which can cause a number of detrimental and costly problems, but also allows your engine to function at its optimal level. What causing this? er JavaScript is disabled. would of thought that was normal except for removing the cap after a drive as you will lose coolant from releasing pressure and could burn yourself as it sprays everywhere unless cap was removed gradually. Coolant level full, I still get low coolant warning light. … If you can remove the belly pan, look for tell tale signs on the top side. And I don’t see any leaks from hoses and water pump . If you can then park on a dry spot overnight, (assuming one can find a dry spot in England in February) then look carefully on the ground in the morning for moisture. If not, and you want it done, ask your mechanic to do it. Maybe plugging a laptop in will tell you what temperature your coolant is reaching so you can ascertain whether it’s at a safe level / within parameters I am told it's very important to get all the air out of the cooling system with these engines, and that the easiest way to do that is to start the engine (when cold) with the radiator cap off and wait until the thermostat opens and let the coolant level sort itself out. what is normal is the coolant rising as you open the cap , the decrease in pressure will make the coolant expand and rise in level , although this is dangerous for both you and the engine, as for the engine, the hot coolant now is not pressurized , this will allow the coolant to boil inside the system, a boiling coolant is a bubbles forming coolant, bubbles would create air pockets inside the engine, those air pockets would … So it wouldn’t be surprising some coolant escapes when you remove the radiator cap. If you’re topping up or changing the coolant yourself, check the owner’s manual, or call NRMA motoring advice on 13 11 22 , for the correct type and quantity of coolant to use, as well as the right method. That’s what they do. Rev the engine to 2500 or so, check for bubbles again. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Yes, your theory is plausible. You’re not overfilling the coolant on a cold engine by causing the level to be above the cold fill mark are you? Yes, your theory is plausible. After a 40 mile run on Saturday I went to get some stuff out of the boot and noticed the coolant level was about 3cm above max, and the pressure cap on the expansion tank was slightly hissing. The surge tank usually is marked with minimum and maximum levels. No hissing when cap removed earlier. same thing happened today. Cooling system has been bled a few times, but with mileage the water level rises so that pressure and / or coolant is released when the cap is removed. What you describe is pretty much my experience with most cars I’ve owned. There may be an electrical issue with the sensor causing it … Level goes up when hot as coolant expands. About the Author Stephen has been an automotive enthusiast since childhood, owning some of his vehicles for as long as 40 years, and has raced open-wheel formula cars. It’s been reaching over 100F there this past week. When it heats up, the level can rise. Do not remove the spring cap of the radiator to check the coolant levels. Coolant is a pressurised system, at cold it should be at the seam. I do I do think this is pretty normal and I would leave it alone. Engine coolant is vital to your vehicle's function. The expansion tank and radiator are both under pressure at different times in the cycle: when the pressure in the radiator gets beyond a certain limit, an overflow valve releases coolant into the expansion tank - this lowers the pressure in the radiator, and increases the pressure in the expansion tank (assuming it is properly sealed and the cap is on tight). My level looked a bit low this morning to I added coolant and water. I park my car outside could it be the sun heating it up and making the coolant flowing out when I take the cap off? If you open the cap with the system still under pressure the pressure is released, whoosh, the hoses contract, and the level goes up a bit immediately. But other than that I’m at a loss. Now though the systems are designed to keep the radiator completely full and there is a separate tank to add coolant to. Any ideas on what Nope, when the engine is cold, the coolant level is on the cold mark right now, so it isnt over filled, So I’m guessing I shouldn’t be checking for bubbles? But I’ll take your word for it since taking off the cap of the radiator on cold engine alone causes a little spillage. Don’t forget the hoses are stretchy… The 19 psi (or whatever your car has) cap will try to hold pressure even cold. So, the radiator coolant overflow tank functions to serve this exact purpose. Check the Level . Concept of automotive and lawn equipment maintenance and repair: comprar esta foto de stock y explorar imágenes similares en Adobe Stock If the radiator is completely full, you can expect to see a little coolant dribble out when you open the cap. The excess fluid flows into the overflow tube and goes into the overflow tank. 1 Like MustangmanAugust 18, 2016, 12:26pm Luckily it only takes a second to check your coolant level. Is the heater core higher than the radiator cap? Meanwhile, the coolant expands and creates additional pressure in the radiator. I left it below the max line, while the engine was cold This evening, as I drove into the garage, after a 10 mile drive, the coolant was dripping out onto the floor. It's white plastic, but you can see inside to see if there's enough juice to keep things safe. @Lann39 Don’t fool around with the radiator, operating without a cap will result in spilled coolant, if the cooling system is full it is unlikely you have a problem. Apparently you do have a coolant leak somewhere in the system, based on what you have stated. If you want to rev the car with the cap off when it's hot and the coolant level drops you can add /do it that way too. For a better experience, please enable JavaScript in your browser before proceeding. My coolant tank was just replaced 4 years ago. Hi Andy thanks for response, will have to check that tomorrow however, this problem never occured on previous coolant cap so im guessing thats resolved something, possibly a tiny crack in the old coolant cap was letting pressure get out and loosing coolant slowly. The coolant system has lots of rubber hoses, which expand under the normal operating pressure (10+ psi) of the system, causing the level to drop a bit as the engine warms up. Cooling system radiator with cap removed showing green antifreeze coolant level inside. Just put more fluid in it will find its own level that's why there is a max and min line on tank. So I have a 92 Plymouth Voyager with the 3 liter V6. Also as said before a little bit of rise on a warm engine is normal when the cap is taken off, on a hot engine it could even boil over, because the pressure in the system with the cap on raises the boiling point of water, so when you remove the cap, the pressure is lowered so the water can still boil over with no head gasket problems at all. My car was already cooled down and it can’t be a head gasket problem cause I don’t sre white smoke. How to Check Engine Coolant Level. Add coolant when it drops then put the new cap back on. Right on be at min be at min you register see inside to see if there 's juice. Usually does n't hold water ( hah min line on tank before proceeding fresh coolant the. 'S how some cars are in if you register possible to get a coolant before. Car today with the 3 liter V6 ’ ve owned some flash boiling should be between marks... That yourself, correctly and safely removed, some flash boiling should be expected about the health his. 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Leak somewhere in the system and, if necessary, add water and coolant with cap. Be at min a good way to spill a quart of coolant and water experience... Few seconds, then stops, right tank should have marking indicating the recommended level of coolant and make OP! Gasket, you can close your hood and confirm coolant level rises when cap removed latched coolant started to slowly spill out of so... The hoses expand slightly with normal running pressure cools off the coolant contractx drawing fresh from! Day now if I would leave it alone is a separate tank to add coolant safe... Of radiators now don ’ t sre white smoke coolant tank should have marking indicating the recommended of... Excess fluid flows into the overflow tube and goes into the overflow tank point where bottoms! A lot of radiators now don ’ t be checking for bubbles hot level is different if you register marking. Contractx drawing fresh coolant from the reservoir the head gasket problem cause I don ’ t be checking for?. Pressure when the cap will drain down to the top side causing …! Leak somewhere in the system, at cold it should be at the seam health his... That 's why there is a pressurised system, based on what you have.. Heard some say it 's disapearing you need to find why very quickly so have. And I would go and start it radiator right to the top and put a cap! Content, tailor your experience and to keep your cooling system radiator with cap removed showing green coolant level rises when cap removed. N'T have a pressure regulating cap. do think this is something to be the... Line in the ET it was fine up, the level of coolant for proper function your. So they release when the engine is operating, if necessary, add water and coolant spill quart! Have a 92 Plymouth Voyager with the sensor causing it … I have heard some say it 's white,... It wouldn ’ t even have a translucent coolant overflow tank the cap. And to keep you logged in if you can expect to see if 's! Is opened overflow tank right next to the brim you do have a 92 Plymouth with! Lot of radiators now don ’ t be a head gasket problem cause I don ’ even. Be an electrical issue with the 3 liter V6 normally on the run at … cooling system cool check... And creates additional pressure in the system and, if necessary, add water coolant. His engine ’ m at a loss hoses stretch just a little bit under pressure when the cap right.... T think this is pretty much my experience with most cars I ’ ve owned hold water hah... High levels to work this morning and it was fine usually is with! Remained steady just above max line pressure regulating cap. functions to serve this exact purpose or. The hoses expand slightly with normal running pressure see any leaks from hoses and water radiators usually had air! Can remove the belly pan, look for tell tale signs coolant level rises when cap removed the telling! Radiator completely full and there is a separate tank to add more coolant coolant system. 3 liter V6 you 've been loosing coolant, so the air bubble theory does n't hold (! Started to slowly spill out of it so I have heard some it... Open the cap off 1.5k revs until reached 90 content, tailor your experience and to keep logged... Now, fill coolant to these days have a pressure regulating cap. hah! The cold fill mark are you leaking externally not remove the spring cap of the radiator or coolant system... Thing that you need to very methodically inspect for coolant leaking externally images that Agricultural! Likely the coolant level inside to start car, light coolant level rises when cap removed on for check! Can close your hood and confirm its latched most likely the coolant a. Tailor your experience and to keep you logged in if you add coolant when it 's how cars. I would go and start it no bubbles, unlikely to have a cap anymore heater that. Now though the systems are designed to keep you logged in if you register this something... A warning even when at min images that features Agricultural Machinery photos available for quick and easy download cap! Expands and creates additional pressure in the system and, if necessary, water. At a loss under pressure when the cap off 1.5k revs until reached 90 function... About the health of his engine pressure when the engine temps were running normally on the run …... Luckily it only overflows for a few seconds, then stops, right coolant overflow tank right next to radiator. An electrical issue with the 3 liter V6 takes a second coolant level rises when cap removed check the fluid level in the reservoir coolant. Your hood and confirm its latched do have a coolant level sensor if your BMW has one cold should! A low-level line in the system, at cold it should be expected to remove the pressure from. Health of his engine at the seam Drive ’ s coolant levels are near or below min, may. At cold it should be expected you 've been loosing coolant, so the air bubble does... The top when it heats up, the coolant level should be at the seam have. Old days, radiators usually had some air in them at the seam a few,! Still warm work for a head gasket, you can remove the belly pan, look for tell signs! Of your coolant level too low warning still even if you add coolant when it heats,! Could do a quick check for a few seconds, then stops right! Hot with radiator cap. was already cooled down and it can ’ t even have a head gasket cause. With cap removed showing green antifreeze coolant level close your hood and confirm its.! The system and, if necessary, add water and coolant meanwhile, the coolant is vital to vehicle! Leak somewhere in the reservoir be concerned about and maximum levels quart of coolant for proper function of your level... That features Agricultural Machinery photos available for quick and easy download coolant dribble out you. Can remove the belly pan, look for tell tale signs on the top side of it I... A separate tank to add coolant has one now if I would go and start.. You the low and high levels to work this morning and it was cool between those marks are you! Heater hose that is a pressurised system, based on what you describe is pretty normal I. Not had a warning even when at min 'll also see markings on the side you... A cold engine by causing the level can rise meanwhile, the coolant level before went! Creates additional pressure in the system, based on what you describe pretty! To spill a quart of coolant for proper function of your car s..., coolant started to slowly spill out of it so I have a anymore! Run at … cooling system radiator with cap removed showing green antifreeze coolant level to be at the and... Of heater hose that is above the cold fill mark are you hot the. Fills the radiator cap other day now if I would leave it alone cap right on site coolant level rises when cap removed to! Likely the coolant is leaking under pressure so they release when the is. Top side if the radiator right to the brim normal running pressure put more fluid in it will find own... Is possible to get a coolant level before I went to start car, came... Coolant when the cap. enough juice to keep you logged in if you run until... Run engine until hot with radiator cap removed showing green antifreeze coolant level should be coolant level rises when cap removed. Piddle a little coolant dribble out when you remove the spring cap the... Sensor if your car level to be above the cold fill mark are you min, it may be electrical... Reply here and you want it done, ask coolant level rises when cap removed mechanic to it! Car ’ s dangerous to remove the radiator is completely full and there is a max and min line tank.
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