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05 STi cooling issue
05 STi cooling issue
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Old 11-23-14, 11:50 AM   #11
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Default Re: 05 STi cooling issue

Okay, thanks for your help!
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Old 11-24-14, 01:11 PM   #12
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Default Re: 05 STi cooling issue

After driving my car hard I noticed that the bubbling has returned and coolant is overflowing my overflow tank. This overflow tank is a powerade bottle with a hose going from the cap to about 1" off of the bottom. If there is air in my system, will the overflow aid in releasing the trapped air?
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Old 11-24-14, 03:29 PM   #13
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Default Re: 05 STi cooling issue

I'm not sure about a powerade bottle, but trapped air generally doesn't overflow the overflow. It usually bubbles out air then sucks in coolant until all the air is bled out. Overheating or a bad cap that can cause a spillover though. In the STI's case having the caps reversed can cause issues too.
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Old 11-24-14, 04:33 PM   #14
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Default Re: 05 STi cooling issue

Caps are where they should be and temp reads okay. This has me stumped.
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Old 11-25-14, 01:16 PM   #15
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Default Re: 05 STi cooling issue

After some thought, I came up with a good theory I think. Since I have a larger radiator, shouldn't I need larger overflow tank that can handle the excess coolant that the larger radiator holds?

Also, is the overflow bottle supposed to be air tight as well?

Edit: found this link (Coolant overflowing - NASIOC)
The last post by Element Tuning covers these two questions.

Last edited by STixSpeed; 11-25-14 at 02:25 PM.
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Old 11-25-14, 08:42 PM   #16
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Default Re: 05 STi cooling issue

I don't know on the first part.

On the second part no you do not want the overflow tank to be air tight.
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Old 09-22-15, 09:36 PM   #17
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Default Re: 05 STi cooling issue

Hello everyone
I'm new to the forum and this question may have been answered but my 05 Sti started to overheat and started dumping coolant out of the passenger side front of the motor any thoughts? It looks like a little faucet pooring out of the plastic cover on the bottom left facing the engine
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Old 09-23-15, 09:41 AM   #18
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Default Re: 05 STi cooling issue

Coolant bypass pipe rusted and leaking would be my first thought.
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