Cars & Vehicles
Antifreeze and Engine Coolant
Chevy Suburban

Why would there be coolant in your exhaust?

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2006-03-19 00:27:58
2006-03-19 00:27:58

catalytic converter converts some oxides to water, so water not a surprise in and of itself. Is there Antifreeze in your exhaust moisture? are you sure it is antifreeze? are you loosing coolant reservoir level at a measurable rate? Coolant only gets into exhaust by way of the cylinder head developing a leak. from the cooling jacket into the exhaust port of a cylinder. if it was leaking into the combustion chamber, you would have coolant in your oil, and the plug would be fouled with scale. possible to attempt a leak seal with K&N Metal Block Seal, if and ONLY if the leak is NOT into a combustion chamber. Or do the right thing and get the head repaired. Or, have your intake gaskets checked for leaks. On the 3.4 the intake gasket can leak coolant into the engine.

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Related Questions


coolant from exhaust indicates a blown headgasket or a cracked head on the engine. be sure that it is coolant and not just condensation coming from exhaust before you do repairs



it sounds like your coolant over flow tank is leaking. it is a common problem with these cars. might also check your radiator for leaks or your exhaust for coolant, but if there is coolant in your exhaust that would mean blown heads


A blown head gasket could allow coolant to enter the combustion chamber from the water jacket. The coolant probably is running out the exhaust on first start-up. More often, you will notice the coolant being pumped out of the overflow as the exhaust gas pressurizes the coolant. You should look for this symptom when the engine warms up. Coolant in the exhaust on start-up and then the coolant overpressure overflow from the expansion tank or radiator happening together is almost sure indication of the head gasket failure.


Coolant leaking out from exhaust is bad news, probably a cracked head or bad head gasket or both. Be sure it is coolant that is leaking and not just plain water. Plain water is normal to drip out the exhaust, it's caused by condensation.


yes, and also usually there will be white smoke in the exhaust.


If your exhaust is getting in your coolant, you have a reeeeeeeeeeeeaaaaaaaaaaaaaaaaallllllllllllllllllyyyyyyyyyyyy major malfunction.


I know the white smoke would be caused by coolant, which would be leaking into the combustion chamber.


Bad head gasket? Oil mixing with coolant?


Could be overheated coolant or just leaked oil burning off your exhaust headers


That is condensation due to the exhaust system being cold and the heat from the engine makes the exhaust system / pipes sweat. As the exhaust system heats up then that will stop. Now you said WATER not antifreeze. If you had engine coolant running out of the exhaust then it would be the color of the antifreeze and it would be steaming WHITE and then you would have an engine problem, MAYJOR. You said water. Drive it you have no problems. That is normal.


Sounds like bad head gasket.


headgasket leak and exhaust gas is getting into the coolant


1) Your engine is overheating and the coolant is boiling. Or 2) Exhaust is leaking into the coolant, probably through a bad head gasket or cracked head.


Also losing coolant i believe. That would most likely be head gaskets. And hopefully only that.


NO there is not, That would be a AIR tube line for the emission system.


You need a special tester called a block check. You fill it with a special fluid and then use it to suck fumes out of the radiator . if the fluid turns yellow it means there is exhaust gasses in the coolant.


If you are only leaking coolant into the exhaust and use the type with copper in it, then yes, it should stop the leak. If coolant is getting into the oil or exhaust is getting into the radiator then no, none of them will do any good.


Coolant getting into the fuel or oil.


Sometimes, when head gaskets go bad, the coolant will be burnt off out of the exhaust system. That may not be noticeable at all.


Coolant can mix with the gas in the combustion chamber. This will happen if you have a blown head gasket or cracked head. Symptoms are white sweet smelling smoke at the exhaust, loss of coolant with no apparent leak, miss on one or more cylinders, & loss of power.


If the smoke is coming from the exhaust then it's coolant. If its not turning over then it could be hydrolocked from a coolant leak.


Without more investigation, the first probable cause would be a Head or Intake gasket leak. Allowing the coolant to seep into the combustion chamber and evaporating out the Exhaust



This is normal (condensation) as long as it is not engine coolant dripping out.



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