This can be expensive though, so if you want to save some money you could use a leak repair fluid at home. Usually starts about a minute or two after shutting the engine off, and it starts with little small bubbles, but then gets really into it with fast big bubbles. This is not to rule out something more serious, certainly if this condition is new to your car and you have had it a long time, then follow all the previous advice to avoid major damage to your lovely old car. Along with it the coolant level was higher and I also heard a whistling sound for a few seconds. If you have a blown headgasket the hot combustion gasses will be being blown into the water jacket with every cylinder firing. I start with a close examination and a pressure test to find the leak. If you do not use proper coolant or normal water, it can make coolant bubbling. Have an issue that popped up and that's the overflow tank was bubbling after shut down. Re-sealant products will flow through the coolant system and when they reach the point of the leak, the sealant will harden into a Comment. the time of peak coolant heat, is when you turn the engine off. The point at which coolant/antifreeze boils depends on the quality of the product itself, and the pressure maintained inside the cooling system. I kept hearing the coolant bubbling after a long drive as well. When a head gasket blows, compressed air from the cylinders can rapidly enter the cooling system, leading to bubbling in the reservoir and coolant/antifreeze seeping into the cylinder head. I unscrewed the cap to the overflow and it started hissing even worse...now it's spraying coolant everwhere and won't stop. Below, we list some of the areas prone to fault that can let air into the system, and offer practical advice on how to fix it. To test for a head gasket problem, check each cylinder of the vehicle with a cylinder leakage tester while the engine is off. The coolant in the reservoir was bubbling because air was getting into the system AND boiling because it was overheating as well. A faulty thermostat that causes sporadic opening and closing can cause a churning and bubbling effect seen in the radiator or expansion reservoir. If the cap develops a fault or is replaced with one that’s not compatible with the system, air can get into the system and cause problems. I turned off the car and heard a boiling/bubbling noise, like coffee perculating. Though it is completely normal to find bubbles in the overflow tank while the engine is not overheating, bubbles in the coolant could be the sign of a leak at the head gasket. A few bubbles, especially after shut off are not a sign of anything. This can cause the engine to overheat very quickly, and you should pull over immediately before it gets worse. Greetings all, I have a 96 NA 5 speed wagon and have noticed the last couple days that after I shut the engine off there is a water bubbling sound in the dash. But it does explain the bubbling of coolant at shutdown. Expansion/overflow tank is supposed to have a higher level when the engine is warm. Water bubbling sound after shutdown? The Temperature gauge reads normal, and both radiator and overflow reservoir levels are good. A car engine can make a variety of noises. Bubbling indicates rising air pressure in the cooling system, which is a sign that the flow of liquid is blocked by a pocket of air. A steady stream of bubbles means a break near one of the cylinders, next to the coolant jacket. The coolant dial doesnt go upper than 90 digrees. Many owners of older cars such as yours install electric cooling fans that come on for several minutes after the engine is shut down to compensate for this rise in coolant temp. Here is a video of the event. Several things cause that, weak radiator cap, thermostat, old coolant, restricted radiator, rusted out fins on water pump, radiator cooling fan not coming on at operating temperature. Popped the hood and noticed the coolant was over an inch below the min. Hello everyone. That's the way it's supposed to work. There are several possible causes for air pockets in the cooling system, and we’ll cover these as part of our guide on what it means when coolant/antifreeze bubbles in the system. This escaped air causes bubbling in the coolant/antifreeze reservoir, which can often be mistaken for boiling. I have a passat 2009 2.0 tsi and yesterday suddenly i heard a noise after shutting down engine, it was the coolant that was bubbling in the res tank. What is the boiling point of coolant/antifreeze? In this case, a pressurized coolant will pass toward the coolant line. Engine coolant at the correct mix ratio and under the the 127kpa pressure has a boiling point of about 125C so the noise you hear is just the coolant expanding as it gets hot and flows into the expansion tank, and this is normal. These do provide safe, permanent repairs – just follow the instructions carefully. When air is allowed to enter this sealed system, blockages and bubbling can occur, which can lead to the engine overheating. Lasts for only a few minutes. I pulled the head off to replace the gasket and found a ton of crusty old grime and corrosion in all the coolant jackets. When air gets into this sealed system, air pockets can form and cause blockages, which can lead to bubbling and overheating. This means that the cooling system steadily fills with air as the liquid leaks into the cylinders, reducing the liquid pressure of the system which causes the fluid to reach boiling point. To maintain pressure, cooling systems rely on a pressurised cap that keeps the system at a constant pressure while allowing coolant/antifreeze to flow to the expansion reservoir. When coolant is hot is expands, and the relief valve in the radiator cap allows it to flow out of the radiator into the overflow tank. Post Cancel. Because there are many fluids and mechanical parts which get hot and cold there can be a gurgling noise which is caused when problems arise. In the case of a blown head gasket, air enters the cooling system and causes bubbling. You will also be able to see coolant leakage on or around the pump. What are your thoughts? It heats the coolant in the block causing it to expand and push past the pressure cap into the overflow reservoir. As touched on above, there are several reasons why air can get into the cooling system, and these range from minor issues to severe mechanical problems. coolant tank is overheating and bubbling after you park it - car drives ok no overheating problem but is bubbling and steaming when parked. Look for leaks around the motor. Ok I have a 1997 Plymouth Breeze with a 2.0 engine. 07-03-20, 01:13 PM. I currently own a turbo-diesel pickup and have had several prior to this one and after it has been worked hard I always let it idle for a short time to cool before shutdown. Many owners of older cars such as yours install electric cooling fans that come on for several minutes after the engine is shut down to compensate for this rise in coolant temp. This can cause the engine to overheat very quickly, and you should pull over immediately before it gets worse. Use the links below to jump to the section you need or read on for the complete guide. I have heard that the bubbling sound might be from air in the line and might be resolved with replacing the radiator cap and thermostat. These usually happen after a coolant/antifreeze flush, when not enough coolant/antifreeze is added to the system to expel any remaining air. The fix: Getting the leak fixed by a professional is one option. A bad water pump will usually be making a squeaking noise. I looked under the car and noticed it was dripping to the ground. Some cars also have a secondary electric coolant pump to circulate coolant after shutdown but I have never owned a 2.0T so I don't know about it. UPDATE on this video:The 1.0 Ecoboost engine has a normal mechanical water pump which circulates the coolant whilst you drive. One of the most common causes is a blown head gasket, in which the air pressure inside the cylinder heads is transferred to the cooling system. 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