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Old 03-30-2012, 09:48 PM   #1
teefivetee
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2005 sti

Default Possible hg?

so ive been bleeding my car trying to get all the air out, my overflow tank keeps getting air bubbles here and there... not every drive, maybe every other drive or every other other drive.

ive prolly read every article google has to offer on this topic, and i dont know what to think, i did the block test, came back Neg...

i bled it for a little over an hour with a No Spill Funnel, no air was coming out, at all towards the end, so figured i was done.

3 drives later these bubbles surface in my overflow....my 2 big questions are this...

1. are the bubbles normal?

2. If it was a HG, wouldnt the bubbles come in on every drive? not jsut certain ones?

thanks guys, appreciate the help


BTW: has a new rad cap, water pump and hoses, just did the pump in the beginning of the month, also the coolant does expand, and does get sucked back in when it cools down too
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Old 03-31-2012, 10:10 AM   #2
blackfang
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I have seen block test come back negative and there was a blown HG. One way we would check this out is we just used a funnel that screwed onto the radiator and added coolant and if the HG was blown, you would see lots of bubbles and not just one or two either.
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Old 03-31-2012, 01:00 PM   #3
teefivetee
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Yeah I'm just not too sure here. Im not losing any coolant at all. It just bubbles a little when I reach where I was going and I Pop the hood right after I park

Thinking maybe a hose leak somewhere ? Idk. I just figured it run weaker or something if.it was the hg
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Old 03-31-2012, 08:55 PM   #4
Bacon117
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Do a pressure test on the cooling system. If the cooling system isn't holding pressure, the coolant has to be going somewhere. Find out where it's going, you have your leak.
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Old 03-31-2012, 09:36 PM   #5
teefivetee
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Quote:
Originally Posted by Bacon117 View Post
Do a pressure test on the cooling system. If the cooling system isn't holding pressure, the coolant has to be going somewhere. Find out where it's going, you have your leak.

thats the crazy thing tho bacon, im not losing anything at all, overflow or the rad...
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Old 04-01-2012, 12:58 PM   #6
teefivetee
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Also...just noticed my bottom.rad hose is always cold....
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Old 04-02-2012, 08:45 AM   #7
Bacon117
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Then I'm confused what bubbles you are getting. Do you mean the coolant is boiling? Did you replace the thermostat? What is your temperature gauge reading? Are you completely certain the coolant system is holding pressure? If it's not, the boiling point of the coolant drops, and you could be boiling. What is your mix of coolant to water?
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Old 04-02-2012, 09:18 AM   #8
teefivetee
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Just repxlaced with an oem stat, 50/50 mix. It's holding pressure and I never overheating.


I'm so confused
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Old 04-02-2012, 09:27 AM   #9
Bacon117
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If everything is good, no overheating, no pressure loss, no bubbles of exhaust, don't worry about it. If it IS a HG, it will certainly let you know eventually. Just don't let the car overheat.
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Old 04-02-2012, 12:29 PM   #10
teefivetee
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yeah, whats normal coolant expansion to you running onm a 50.50 setup...

i started today when it was cold like right under halfway b.w the full and min mark...

and after a few drives today, id say after about 45 min of on and off driving its marginally above the max point

normal? id figure itd only keep going up if i kept driving today, but i wont be driving for a few hours now....ur thoughts?
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Old 04-02-2012, 12:58 PM   #11
Bacon117
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Sounds normal. The overflow will be fuller when hot, and lower when cold. Completely normal, and means everything is work ok. As long as it doesn't overflow, or empty out completely on it's own. You are fine.
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Old 04-02-2012, 04:22 PM   #12
teefivetee
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Quote:
Originally Posted by Bacon117 View Post
Sounds normal. The overflow will be fuller when hot, and lower when cold. Completely normal, and means everything is work ok. As long as it doesn't overflow, or empty out completely on it's own. You are fine.

ah word, awesome. if anything seems abnormal maybe ill go get a new rad cap and see if that does anything, other than that, hopefully this is it
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