Re: Cooling system bubbles, help!

Ok guys,

I ran some tests tonight to rule out the possibility of gasses in the
cooling system.
Without turning on the engine I opened the radiator cap, added water
till full, then turned the engine on and added more water while
running. When it reached the top, I closed the cap and started heating
the engine up. As it got to the middle, no bubbles or at least that I
noticed from the reserve tank. I ran it for like 20 mins with the hood
closed so it would make the most heat possible. Temperature was fine in
the middle.
I turned it off and as the engine started to cool I heard some pressure
noises coming from the cap and then the bubbles started to come out on
the reserve tank. It sounded like boiling water and it got really hot.
I left it there cooling down and I will try it again in about an hour
or so when the engine completely cools down.
Do you think I am missing something I should be doing or am I doing it
correctly. For some reason the bubbles come after I turn the engine off
(they make the most noise). When the engine was running I touched the
reserve tank to feel for bubbles but didn't feel them that much as when
I turned it off that it really appeared to be boiling the water in the
reserve.

Any suggestions on what it might be now that I ran the test. I wonder
if it's the cap since I heard the noises of the gasses passing through
it but I guess it's normal if there is a lot of steam.

Regards and thanks,

Teo
Thomas Tornblom wrote:
I suggest you try to get a leakdown test done.

That will likely show if there's a head gasket issue, and if the test
is taken with the pistons in different positions, it will even catch a
cracked cylinder.

If you have air coming out into the tank, you might try (carefully) to
sniff if it is just steam (probably no problem) or combustion gasses
(serious problem).

.

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