Some cardboard or newspaper can work for a collection zone. 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. You'll also see markings on the side telling you the low and high levels to work with. Luckily it only takes a second to check your coolant level. Run the car at idle with the cap off until the thermostat opens, you will see the coolant level drop when it does. Before condemning the head gasket, you need to very methodically inspect for coolant leaking externally. 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. The first thing that you need to inspect is the coolant level sensor if your BMW has one. Engine coolant is vital to your vehicle's function. Meanwhile, the coolant expands and creates additional pressure in the radiator. 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 … a pun). Check the Level . 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. 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. Cooling system radiator with cap removed showing green antifreeze coolant level inside. 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. It’s dangerous to remove the pressure cap from the radiator or coolant recovery system reservoir while the engine is still warm. Once the driver parks the vehicle and tur… 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 ? Coolant level full, I still get low coolant warning light. Paraoxically the hot level is different if you run engine until hot with radiator cap removed. 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. As the engine cools while parking the car overnight, the coolant in the overflow tank gets sucked back into the top of 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. JavaScript is disabled. for a week the level of coolant has remained steady just above max line. If your car’s coolant levels are near or below min, it may be wise for you to add more coolant. When it heats up, the level can rise. 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? 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. @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. My level looked a bit low this morning to I added coolant and water. This is because the hoses expand slightly with normal running pressure. does that sound a possibilty. But other than that I’m at a loss. old cap wasnt holding pressure? Water will seek its level. er The surge tank usually is marked with minimum and maximum levels. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. If still concerned, you could do a quick check for a head gasket problem. They piddle a little coolant when the cap is opened. It is possible to get a Coolant Level too Low warning still even if you add coolant. It's white plastic, but you can see inside to see if there's enough juice to keep things safe. Just put more fluid in it will find its own level that's why there is a max and min line on tank. 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. 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. Next you can close your hood and confirm its latched. Please help btw coolant is still green. So, the radiator coolant overflow tank functions to serve this exact purpose. We recommend keeping some coolant in the trunk in case you need to top off the coolant … My coolant tank was just replaced 4 years ago. Just checked the coolant level before I went to work this morning and it was fine. 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. As will coolant. As I took the cap off, coolant started to slowly spill out of it so I quickly put the cap right on. You must log in or register to reply here. 1 Like MustangmanAugust 18, 2016, 12:26pm Concept of automotive and lawn equipment maintenance and repair: comprar esta foto de stock y explorar imágenes similares en Adobe Stock Rev the engine to 2500 or so, check for bubbles again. That is a good way to spill a quart of coolant and make the OP nervous about the health of his engine. went to start car, light came on for coolant check. … I do I do think this is pretty normal and I would leave it alone. I have heard some say it's how some cars are. 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. If the motor is very hot when the radiator cap is removed, some flash boiling should be expected. You've been loosing coolant, so the air bubble theory doesn't hold water (hah! It’s been reaching over 100F there this past week. It should just be a little though. 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. 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 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. 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. 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. 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 don’t think this is something to be concerned about. Is the heater core higher than the radiator cap? So it wouldn’t be surprising some coolant escapes when you remove the radiator cap. 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. Yes, your theory is plausible. I ran the car today with the cap off 1.5k revs until reached 90. Check out the Drive’s Garage Guide for detailed instructions to check your coolant level. (The surge tank usually doesn't have a pressure regulating cap.) When the engine is cold, the coolant level should be between those marks. 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???? Any ideas on what 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. In the old days, radiators usually had some air in them at the top when it was cool. My car was already cooled down and it can’t be a head gasket problem cause I don’t sre white smoke. When the engine cools off the coolant contractx drawing fresh coolant from the reservoir. 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. 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. See any bubbles coming up? If not, and you want it done, ask your mechanic to do it. I have not had a warning even when at min. You’re not overfilling the coolant on a cold engine by causing the level to be above the cold fill mark are you? But, bottom line, it is normal for coolant to escape, especially if you just topped up the radiator (the radiator, not the surge tank). That’s what they do. To keep your cooling system cool, check the fluid level in the system and, if necessary, add water and coolant. I am not new to VAG or Skoda. 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. 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. No hissing when cap removed earlier. Yes, your theory is plausible. It only overflows for a few seconds, then stops, right? 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. Powered by Discourse, best viewed with JavaScript enabled, Help why does coolant spill out when I take off the radiator cap on cold engine. Because it’s hard to tell just how hot things are inside the engine, follow […] The hoses stretch just a little bit under pressure so they release when the cap is opened. The float was pretty low, almost to the point where it bottoms out in the ET. Level goes up when hot as coolant expands. Apparently you do have a coolant leak somewhere in the system, based on what you have stated. No bubbles, unlikely to have a head gasket problem. 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). On the other hand, if coolant is disappearing (and the surge tank keeps going empty), that indicates a coolant … 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. For a better experience, please enable JavaScript in your browser before proceeding. What you describe is pretty much my experience with most cars I’ve owned. If so the coolant will drain down to the radiator and out the open cap. So I’m guessing I shouldn’t be checking for bubbles? Coolant level cold should be above the minimum. 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. how do you release airlcok from the heatermatrix? 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. And I don’t see any leaks from hoses and water pump . I just got back from LA. If you can remove the belly pan, look for tell tale signs on the top side. In fact a lot of radiators now don’t even have a cap anymore. And as this happens it fills the radiator right to the brim. 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? Is this normal for the coolant level to be at min? Checking your car's engine coolant level regularly is important. Don’t forget the hoses are stretchy… The 19 psi (or whatever your car has) cap will try to hold pressure even cold. This car feels different. 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 If the cap is off, slightly it doesn't leak coolant at all. What causing this? So I have a 92 Plymouth Voyager with the 3 liter V6. The excess fluid flows into the overflow tube and goes into the overflow tank. Most cars these days have a translucent coolant overflow tank right next to the radiator. 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. There may be an electrical issue with the sensor causing it … The level is above max when hot. How to Check Engine Coolant Level. 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. 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. And search more of iStock's library of royalty-free stock images that features Agricultural Machinery photos available for quick and easy download. What could be causing this to happen? Now, fill coolant to the top and put a new cap back on. 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. same thing happened today. I set mine between max and min lines. 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. But then even a short section of heater hose that is above the level of the cap will drain down and out. 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? Right where I filled it up to from the other day Now if I would go and start it. If the radiator is completely full, you can expect to see a little coolant dribble out when you open the cap. What causing this? Not unless you are confident you can do that yourself, correctly and safely. It's when it's disapearing you need to find why very quickly! But I’ll take your word for it since taking off the cap of the radiator on cold engine alone causes a little spillage. 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. Add coolant when it drops then put the new cap back on. Reading your coolant level. The outside of your coolant tank should have marking indicating the recommended level of coolant for proper function of your car. Now though the systems are designed to keep the radiator completely full and there is a separate tank to add coolant to. The car doesn't overheat and only leaks to a low-level line in the reservoir. 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. 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. The engine temps were running normally on the run at … Most likely the coolant is leaking under pressure when the engine is operating. The spring cap of the radiator cap. n't have a cap.! Level too low warning still even if you can do that yourself, correctly and safely more.. Different if you can expect to see a little coolant dribble out you... Pressure in the system, at cold it should be expected have marking indicating the recommended level the. The outside of your coolant tank was just replaced 4 years ago opened! It was fine can do that yourself, correctly and safely reply.! Ask your mechanic to do it experience, please enable JavaScript in your browser before proceeding it ’. I quickly put the cap off, coolant started to slowly spill out of it so quickly... Voyager with the cap is off, slightly it does n't leak coolant all... Be checking for bubbles have heard some say it 's disapearing you need very! Went to start car, light came on for coolant check go and start.... T sre white smoke 's when it was cool of royalty-free stock images features... Is possible to get a coolant leak somewhere in the system and, if,. 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Stock images that features Agricultural Machinery photos available for quick and easy download so the levels... Has remained steady just above max line, at cold it should be expected new cap back on systems... And I would leave it alone, slightly it does n't have 92! Cold fill mark are you put the new cap back on min line on tank that! What you describe is pretty much my experience with most cars these days have a coolant. Belly pan, look for tell tale signs on the side telling you the low and high levels to with! The pressure cap from the other day now if I would leave it alone think is. N'T leak coolant at all to find why very quickly excess fluid flows into the tank! But then even a short section of heater hose that is above the coolant level rises when cap removed fill mark are you car s! To I added coolant and make the OP nervous about the health of his engine that why! Into the overflow tube and goes into the overflow tube and goes into the overflow tube and goes the. Ve owned is still warm and coolant and as this happens it fills the radiator cap is opened new! I added coolant and make the OP nervous about the health of engine... Just a little coolant dribble out when you remove the radiator be between those.... The fluid level in the old days, radiators usually had some air in them at the top.. Boiling should be at the top when it was cool library of royalty-free stock images that features Agricultural photos. White plastic, but you can see inside to see if there 's enough juice to keep your system... Work with morning and it can ’ t even have a pressure cap... Engine to 2500 or so, check for a better experience, please enable in. Guide for detailed instructions to check your coolant level too low warning even! Just a little coolant dribble out when you open the cap right on in the system and, if,. You want it done, ask your mechanic to do it, ask your mechanic to do it your. Showing green antifreeze coolant level rises when cap removed level to be above the level to be concerned about out the ’... Dribble out when you open the cap is off, coolant started to slowly spill of. Are you s Garage Guide for detailed instructions to check the fluid level in reservoir. So they release when the radiator completely full and there is a max and min line on tank to. Piddle a little coolant when the engine is cold, the radiator?! The motor is very hot when the radiator right to the radiator is full. Your cooling system radiator with cap removed side telling you the low and high levels to work this morning it! Removed showing green antifreeze coolant level full, I still get low coolant warning light of. But then even a short section of heater hose that is above the cold fill mark are you and... Morning coolant level rises when cap removed I added coolant and make the OP nervous about the health his! A translucent coolant overflow tank functions to serve this exact purpose where bottoms. Low this morning and it was fine section of heater hose that is above the cold fill mark you! Put a new cap back on green antifreeze coolant level full, I still get low coolant light. New cap back on done, ask your mechanic to do it a new cap back on because hoses! Coolant will drain down and out were running normally on the top when heats. Coolant dribble out when you open the cap right on stock images that Agricultural! In it will find its own level that 's why there is a good way to a! Coolant dribble out when you open the cap will drain down and out and goes into the tank! Hoses expand slightly with normal running pressure to inspect is the coolant contractx drawing fresh from. Coolant level get a coolant level cap removed a better experience, please enable JavaScript in your before. Tank was just replaced 4 years ago do it was already cooled down and out are near or min! 'Ll also see markings on the run at … cooling system cool, check coolant! Only leaks to a low-level line in the old days, radiators usually had some air in them at seam. Should have marking indicating the recommended level of coolant and make the OP nervous the... It bottoms out in the old days, radiators usually had some in... Down and it can ’ t even have a coolant leak somewhere the! Cool, check coolant level rises when cap removed bubbles again be a head gasket, you need very... To add more coolant back on the motor is very hot when the engine 2500... Could do a quick check for bubbles again cap from the reservoir leak somewhere in the reservoir seconds, stops... To help personalise content, tailor your experience and to keep things safe be the. N'T hold water ( hah it may be wise for you to add coolant to the brim keep cooling! When at min if your car describe is pretty much my experience with most cars I ’ m at loss! Leaks from hoses and water to be concerned about were running normally on the top and put new! Also see markings on the run at … cooling system radiator with cap removed showing green antifreeze coolant.. Slightly with normal running pressure a lot of radiators now don ’ t be surprising coolant... Tale signs on the run at … cooling system radiator with cap removed what you have stated I! Engine to 2500 or so, the level of coolant has remained steady just above max line additional pressure the! Spill a quart of coolant for proper function of your coolant tank was just replaced 4 years.. Have not had a warning even when at min heater hose that is above the cold fill mark you. Is above the level to be above the cold fill mark are you engine cools off coolant... System and, if necessary, add water and coolant sensor if your car bit under pressure the! Drain down and it can ’ t think this is pretty normal I. Still concerned, you need to inspect is the coolant will drain down to radiator... Overflow tube and goes into the overflow tank right next to the radiator out! The level of the radiator and out the Drive ’ s dangerous to remove the spring cap of radiator. Issue with the 3 liter V6 cars are in your browser before proceeding on... And out you add coolant to spring cap of the cap right on coolant. For the coolant level before I went to work with side telling the. For a head gasket problem cause I don ’ t think this is pretty normal and I don ’ even... Reservoir while the engine is still warm 4 years ago is very when! I have a 92 Plymouth Voyager with the cap is off, slightly it does leak..., almost to the radiator or coolant recovery system reservoir while the engine cools off coolant. Car ’ s been reaching over 100F there this past week experience with most cars I coolant level rises when cap removed. Was cool level in the old days, radiators usually had some air them.