coolant bubbling after shutdown

    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. This escaped air causes bubbling in the coolant/antifreeze reservoir, which can often be mistaken for boiling. 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. 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. These hoses are arranged in a sealed loop, which allows a smooth and constant flow of coolant/antifreeze to reach components including the head gasket, cylinder heads and engine block – keeping the engine working at the right temperature. Higher operating temperature, which could lead to overheating. Pop the hood, the noise is coming from the coolant bottle by the radiator, and it's shaking violently. I have a 4.0, 2002, 3 speed trans, and 3.73 gears, so the Rpms were pretty high on the highway. I have a 78 corvette, automatic, and the other day when i returned the car to the garage and turned the car off I noticed it was running a little hot, not overheating, just hotter than usual. 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. Some water pumps are easier to change than others, and you don't necessarily need to change the timing belt. I had a pinhole leak under the exhaust manifold that let coolant out but it evaporated so fast i never saw a leak, only noticed because i saw my resevoir getting low, and when the car cooled down it would suck air back in trough the hole causing bubbling after shutdown. First make sure you have no air in the system. UPDATE on this video:The 1.0 Ecoboost engine has a normal mechanical water pump which circulates the coolant whilst you drive. Make sure the cap is replaced with an OEM (original equipment manufacturer) component, or one directly recommended by the manufacturer. Need help guys. I checked and there was a puddle of antifreeze on the ground of the garage. Have an issue that popped up and that's the overflow tank was bubbling after shut down. A few bubbles, especially after shut off are not a sign of anything. Read our comprehensive guide on how to do a coolant flush. It causes the engine to overheat. “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.”, Have your cooling system pressure tested for leaks…That puddle on the floor came from SOMEPLACE…, If no leaks are found, and this continues, your engine might have a “hot’spot”, a place in the head(s) where corrosion has restricted coolant flow…, Powered by Discourse, best viewed with JavaScript enabled. Post by bovw » 20 Nov 2012, 13:05. Yes it was a hard drive. When running the a/c, about 20 seconds AFTER the car is shut off, the coolant bubbles to the resevoir. Water bubbling sound after shutdown? 2012 PB Challenger LS Manual. Next thing I noticed, after a 30 minute road trip...the overflow tank was bubbling to the top and was leaking through the bottom. In this case, a pressurized coolant will pass toward the coolant line. Coolant tank making a bubbling/gurgling sound while driving and after shut down. Cooling systems are pressurised to raise the boiling point of the fluid, with the pressure cap and the overflow helping to raise the temperature at which the coolant/antifreeze boils. the time of peak coolant heat, is when you turn the engine off. The coolant expands as it heats and needs somewhere to go. I turned off the car and heard a boiling/bubbling noise, like coffee perculating. If you do not use proper coolant or normal water, it can make coolant bubbling. A faulty thermostat that causes sporadic opening and closing can cause a churning and bubbling effect seen in the radiator or expansion reservoir. 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. In the case of a blown head gasket, air enters the cooling system and causes bubbling. 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. 07-03-20, 01:13 PM. Coolant in reservoir Bubbled & Boiled- brought it to garage for checks) RESULTS: Well, it was a bad radiator cap, cracked (plastic) radiator and a bad thermostat (not working effectively). I think you need to have your cooling system pressure-tested. When air gets into this sealed system, air pockets can form and cause blockages, which can lead to bubbling and overheating. You need expert service to be able to check these. And DO NOT let a tire store or Wal-Mart do that work. 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. 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. Bubbling hot may mean you have bad cooling system, maybe a bad stucked-up thermostat, but if you observe air bubbles, then you may have a bad head gasket. This coolant boiling problem can be caused by a busted cooling fan, clogged passages in the radiator, a closed thermostat, etc. Check it again when it's cold. The only way it gets there from the reservoir is when the engine cools and contracts, drawing fluid back into it through the radiator cap. The fix: If a fault develops with the pressure cap, it will need to be replaced before the pressure change can cause damage to the radiator. Replacing the radiator cap is a cheap way to rule it out as the cause, but I think something else is going on. This can cause the engine to overheat very quickly, and you should pull over immediately before it gets worse. 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. The radiator is maybe 15k old, so unlikely blocked. 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. Thinking hose leak around the thermostat housing as the noise was coming from there but no coolant is visible anywhere. The fix: Getting the leak fixed by a professional is one option. This can cause the engine to overheat very quickly, and you should pull over immediately before it gets worse. I unscrewed the cap to the overflow and it started hissing even worse...now it's spraying coolant everwhere and won't stop. This can make a bubbling noise. By the way, by filling the reservoir and letting the engine run you were not getting coolant into the engine. A steady stream of bubbles means a break near one of the cylinders, next to the coolant jacket. Thanks. 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