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How do you know if you have air trapped in your coolant system?

Old 07-May-2006, 05:19 PM
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How do you know if you have air trapped in your coolant system?

Hi,

Just wondering how you would know if you have air trapped in your coolant system/radiator which can lead to headgasket and other troubles?

THX!
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Old 07-May-2006, 09:34 PM
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well what i heard u do is start the car with the rad cap off let it run for a while and watch for air bubbles rising in the coolant. if there are bubbles then that means u have air in the system
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Old 07-May-2006, 09:39 PM
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yup, check for bubbles.
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Old 07-May-2006, 09:58 PM
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If you have air trapped in your cooling system. your car would overheat usually rather quickly.
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Old 07-May-2006, 10:10 PM
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Well, that's what I did. Radiator cap off and let the car idle until operating temperature. But the coolant just comes spilling out of the radiator (no air bubbles though).

So what does that mean?
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Old 07-May-2006, 10:21 PM
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overheating.. or your turn your heat all the way up.. if its not hot then you got an air lock.
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Old 07-May-2006, 10:22 PM
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Originally posted by Mikeye
Well, that's what I did. Radiator cap off and let the car idle until operating temperature. But the coolant just comes spilling out of the radiator (no air bubbles though).

So what does that mean?
means its fine
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Old 07-May-2006, 10:22 PM
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did u bleed it via the bleeder valve?
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Old 07-May-2006, 10:49 PM
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Originally posted by chris_si98
overheating.. or your turn your heat all the way up.. if its not hot then you got an air lock.
Overheating? So internally? Well, tried it again and the heat is hot. So I guess that's a good sign.
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Old 07-May-2006, 10:54 PM
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if heat is hot its fine.

why do you think theres air in your sys. anyways?
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Old 07-May-2006, 11:12 PM
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Because the mechanic who did my coolant flush was a super newb. I dunno if he did everything rite so I just wanted to make sure. Also, my friend blew his headgasket recently because of an improper coolant flush leading to air bubbles in his system which caused overheating, etc.
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Old 07-May-2006, 11:19 PM
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like i said,.. if your heater is functioning and you aren't overheating. its fine
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Old 07-May-2006, 11:54 PM
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Hey Chris, when you say overheating, you mean by looking at my temperature gauge rite?
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Old 08-May-2006, 03:30 AM
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simplest way to tell if you have bubbles is

look at the engine temperature.
if there is an air bubble the car's temperature needle will fluctuate and go up and down often.
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Old 08-May-2006, 07:34 AM
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Originally posted by Mikeye
Hey Chris, when you say overheating, you mean by looking at my temperature gauge rite?
ya
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Old 08-May-2006, 09:24 AM
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You aren't suppose to take off the cap to bleed. Unlock the cap but leave it on the rad (still locked, but not tight), wait until the fan goes on twice. Tighten it and you are done.
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Old 09-May-2006, 08:10 PM
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My heat doesnt work but operates at correct temperatures... whats wrong?
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Old 09-May-2006, 08:19 PM
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sounds like you heater core is not working
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Old 09-May-2006, 08:51 PM
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Originally posted by Joe_98Si
sounds like you heater core is not working
good one einstein


.. did you recently do a coolant flush?

that doesnt make sense. The heat is transferred from your coolant.. so before OT it shouldnt be hot.. it should just be warm.

Is it cool when its on hot? or just warm?
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Old 09-May-2006, 11:58 PM
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Bubbles in the rad is a very bad sign. 9 times out of 10 it's the head gasket because it's blowing air into the coolant passages.

When you fill new fluid, you're only supposed to put 3/4 of the jug so the water pump doesnt run dry, turn the heat all the way on and fill it up to the rim and fill the overflow to the MIN level...if you still have bubbles after that, looks like your headgasket doesnt like you anymore.
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