Why is coolant coming out from the exhaust pipe of a car?

[LeAthena]

The reasons for coolant coming out from the exhaust pipe of a car are as follows: Excessive coolant: If the coolant exceeds the marked line on the reservoir, it may overflow during driving. Thermostat failure: A faulty thermostat can cause the water temperature to rise excessively. When the water temperature is too high, the coolant cannot enter the engine's water passages for major circulation. As a result, the coolant circulates only within the radiator (minor circulation), leading to overflow. If the water passage in the engine cylinder head gasket is damaged, high-temperature and high-pressure exhaust gases from the combustion chamber can enter the cooling system through the damaged area. This causes a rapid increase in temperature and pressure within the system, forcing these high-temperature and high-pressure gases to be released.

[Ava]

If you notice coolant coming out of the exhaust pipe, it's definitely not a minor issue. This usually indicates an internal engine coolant leak, most commonly caused by a blown head gasket or a cracked engine block, allowing coolant to mix into the combustion chamber and exit with the exhaust gases. I remember encountering this problem before – when the AC was turned on, there was a sweet smell and white smoke from the tailpipe, which clearly indicated coolant leakage. If not repaired promptly, it can damage the engine block or even cause overheating and stalling. The safest approach is to stop driving immediately and have the car towed to a repair shop for inspection. Don’t try to fix it yourself to save money, as it could make things worse. Make it a habit to check the coolant level monthly—if it’s low, it might be an early warning sign. Addressing it early can save you both money and hassle.

[DeHarrison]

I've encountered a similar issue with my car where the antifreeze leaked into the exhaust pipe. This usually happens when the cylinder head gasket fails, allowing coolant to seep into the combustion chamber and get expelled with the exhaust. You might notice symptoms like reduced power, thick white smoke from the tailpipe, and a strange odor. My advice is to stay calm - first, stop the vehicle and check the coolant reservoir. If the level has dropped significantly, the problem is likely internal, so don't simply add water for testing. Then have a professional use a diagnostic tool to measure cylinder compression and pinpoint the issue. While the repair (typically involving head gasket replacement) isn't cheap, delaying could lead to complete engine failure. Remember, this isn't a minor problem - safety comes first.

[MalachiMarie]

Antifreeze coming out of the exhaust pipe is very dangerous, mainly due to a failed cylinder head gasket or internal engine cracks, causing coolant to leak into the combustion chamber and mix with exhaust gases. When I see this situation, I advise people to stop the car immediately and not continue driving, as it can easily damage the catalytic converter or harm the cylinders. For repairs, the engine needs to be disassembled to replace the cylinder head gasket or fix the cracked areas, with costs ranging from hundreds to thousands. Regular maintenance should include periodic checks of the cooling system to prevent seal aging from causing trouble.