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Coolant bubbling in resevoir

Coolant bubbling in resivoir

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I assume the coolant is not actually boiling and that the coolant is bubbling even when the engine is relatively cold. If so this would indicate a blown head gasket. Exhaust gases are escaping from a cylinder into the coolant passageways at the head gasket junction

Posted on Jun 03, 2010

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2004 Dodge Durango 5.7 hemi over heating i have replaced radiator,fan clutch, hoses, radiator cap, 3 thermostats and water pump whats next


Sounds like head gasket has gone. Hot gas from the fuel combustion is being forced through holes in the head gasket into the cooling system, causing hot bubbles in the coolant, sniff the bubbles blowing out of the reservoir, does it smell like fuel?

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Oil in resevoir, and radiator


If you have engine oil in the coolant, probably a bad head gasket leak. Any evidence of coolant on the oil dipstick? A bad head gasket will show up as low compression on one cylinder, or in two adjacent cylinders. So have the compression tested.

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All that needs to be done is "burp" the system of the air bubble inside the heater core.(be sure that the vacuum lines are connected to the heater control valve)


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Park the truck on a steep incline so the front is angled up at about a 30* angle.
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Usually about 2 quarts.
After one cycle of hot and then cool,the resevoir/overflow bottle will cycle and pull the bubble out of the system.

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1 Answer

Gs300 coolant is bubbling in resevoir,but temp is fine ?


Get coolant temp sensor checked.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

Click the link below :-----


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http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

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Where's the power steering fill resevoir


The resivoir is on or near the pump. The pump is driven by a belt. So follow the belts and you will find the pump and resivoir.

Jan 05, 2011 | 1989 Chevrolet Astro Cargo

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Heater core leak, could be core


needs to be pressure checked... to locate the leak acuratly, use water to fill coolant resivoir, then pressure test it, look for blowing bubbling coolant leak.

Jan 02, 2011 | 1998 Cadillac DeVille

1 Answer

Last night I was driving my 1996 volvo 850 and white smoke came out from under the passenger side of the hood. I added coolant because the resevoir was empty. The coolant bubbled a lot. This afternoon I...


it could be a blown head gasket or could be a stuck thermostat causing the coolant to bowel and the only place to go is out the resevoir bottle pull your oil dipstick check to see if you can see little water bubbles in the oil on the stick this kinda gives you an idea if the head gasket is blown because most of the time the coolant will mix with the oil if the thermostat is stuck close it will lead to a blown head gasket if you dont get it taken care of also you may have a slow leak in the water pump and once the level gets low its going to bowel whats left and the stem will come out the over flow tube on the bottle

Sep 18, 2010 | 1995 Volvo 850

1 Answer

Water coolant resevoir "bubbles" and temp gauge fluctuates


Check your radiator cap...the rubber seal maybe bad...and as for your guage...check the coolant temp switch or sensor...One controls the fan, and the other controls the guage..

Nov 30, 2009 | 2002 Mazda Protege

1 Answer

97 deville overheating after having to replace coolant resevoir.Once you let it cool and cycle fluid w/cap off resevoir,it will start forcefully bubbling out and temp.info center reading starts climing...


Gas bubbles in the coolant resevoir while the motor is running indicates a blown head gasket.
If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.

I think you need the head gasket replaced.

Oct 08, 2009 | 1997 Cadillac DeVille

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