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Air in coolant?

 
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Old 05-13-2010, 10:03 PM
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Air in coolant?

i am not sure if i have air in my coolant but when i open the cap i see bubbles but it goes away after a few sec is normal? do i need to bleed it? if so how do i do it?
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Old 05-13-2010, 10:18 PM
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Re: Air in coolant?

you might need to bleed it. there is a bleeder valve on the thermostat if i remembe correctly. honestly though, you should not really have to. i never bled it that way and mine is fine. i just leave the cap off and let it circulate until it gets hot, then let it cool and repeat. its lazy and works fine! haha but just because you see some bubbles does not mean it needs to be bled.. unless you are talking about really bad bubbles!
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Old 05-13-2010, 10:59 PM
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Re: Air in coolant?

little more specific? was the engine running when you did this?

or you mean literally as soon as you lifted the cap off the coolant was moving around?
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Old 05-14-2010, 06:36 AM
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Re: Air in coolant?

hey man, this may, or may not be the cause..,I for one, hope not.., but if those bubbles are a consistant thing..., that probably means that there is a leak in your head gasket..

not a leak to the outside where its visable.., but a leak where the pressure from the cylinders, pushes exhaust gasses into your coolant.., therefore causing bubbles.., I have seen it a few times., mostly on hondas from the late 80's to early 90's.., and one 1994 civic.. which was my dads..., but it suprisingly hasn't gotten any worse in about a year of regular driving.., but still.......

with the coolant being under pressure, means no air, or any gasses could enter anywhere, other than the combustion chamber..,which unfortunately has more pressure than the coolant...

In my experiences with this problem, there wasn't any coolant in the oil, nor oil in coolant.., It took me a while to figure this one out.., It took the internet and a compression test to confirm, that this was the problem..., and still, it was difficult, because the pressurized coolant put alot of resistance on the leakage, which hardly made a noticable difference in the compression test... another indication is if your car ever starts to overheat the faster you drive, and cools down when slowing, or while stopped at a light or something..., bingo

try this.., start your car with the radiator cap off and observe..., there is more chance for leakage while engine is cold...
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Old 05-14-2010, 09:03 AM
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Re: Air in coolant?

^very informative and yet sooooo much better to read in white then in gray!!!
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Old 05-14-2010, 04:25 PM
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Re: Air in coolant?

i dont think its that serious or i hope not at least. theres only a lil bubbles after driving for a week or so. and with engine off
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