Welcome to the North American Subaru Impreza Owners Club Thursday November 21, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 08-29-2019, 10:16 AM   #1
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default 2008 Impreza 2.5i bubbling in the overflow tank

Around 3 months ago I replaced the head gaskets, timing belt, water pump, thermostat, radiator, etc on my Impreza. All has been good up until now. Last Saturday I was driving into the office for some out of hours work (the joy of IT no one tells you about) and the temp light started flashing red. First time I've ever seen that, pulled off at the nearest has station and when I opened the lid for the overflow tank I could see a bubble every second or so. Once I got done working for the day I pulled off the radiator cap, topped off the radiator and started the car. At that point I saw no bubbles in the radiator. Drove home without incident but when I got home the bubbles were back in the overflow tank. Put a new radiator cap on because it's an inexpensive thing to try. Still happening. Did I mess up putting the head gaskets in or did I not purge the cooling system properly when I refilled it? If it helps, my normal commute is 1.5 miles each way to the train station. When I have to drive in to the office it's around 50 miles each way.
* Registered users of the site do not see these ads.
smccloud is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-29-2019, 01:34 PM   #2
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

When up to temperature, sounds like there's just enough gap to allow combustion gasses into the coolant. When things cool off, the gap closes, no bubbles. Did you have the heads or block checked for flatness?
yarrgh is offline   Reply With Quote
Old 08-29-2019, 02:09 PM   #3
Blktrax
Scooby Specialist
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: West, NC
Vehicle:
2002 WRX 224K Mi.

Default

If you didnít measure the heads for flatness or have them machined likely the heads were warped from the previous gaskets.

Alternatively if the proper torque and sequence wasnít followed would also lead to head gasket failure.

3rd and somewhat rare possibility depending on the heads condition and if they were overheated, sometimes internal cracks happen in the head itself, and only open up as the metal heats up.
Blktrax is offline   Reply With Quote
Old 09-01-2019, 09:00 PM   #4
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

I think I missed a step on one side when I torqued the heads. Sounds like I get to replace the head gaskets again

Not sure where I be can even get there heads machined, I don't think there is a machine shop anywhere me :+
smccloud is offline   Reply With Quote
Old 09-02-2019, 11:57 AM   #5
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

I had traded my car for my dad's pickup for the weekend because the wife kids and I went camping. He noticed that the lower radiator hose was weeping done, could that be part of the issue too?
smccloud is offline   Reply With Quote
Old 09-04-2019, 07:36 AM   #6
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

And it was the lower radiator hose being slightly loose
smccloud is offline   Reply With Quote
Old 09-04-2019, 01:39 PM   #7
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

good to hear you found the culprit. thx for following up.
yarrgh is offline   Reply With Quote
Old 09-04-2019, 03:21 PM   #8
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

Quote:
Originally Posted by yarrgh View Post
good to hear you found the culprit. thx for following up.
Actually my dad found the culprit. Thankfully he was willing to look at it while we had his truck so we could bring the bikes camping over Labor Day weekend. Helps that he used to be an ASE Certified Master Technician.
smccloud is offline   Reply With Quote
Old 09-23-2019, 09:03 PM   #9
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

And looks like I was to soon to call it solved. When I start it up now I can smell a little bit of coolant being burnt. Only on startup though. Oil looks good and the coolant isn't dropping to fast. Guess I'm doing head gaskets again in the near future....

These any good? I'm on a tight budget. https://www.rockauto.com/en/catalog/...head+bolt,5308
smccloud is offline   Reply With Quote
Old 09-24-2019, 02:33 PM   #10
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

You can reuse the bolts.
yarrgh is offline   Reply With Quote
Old 09-24-2019, 07:42 PM   #11
smccloud
Scooby Newbie
 
Member#: 442552
Join Date: Mar 2016
Default

Quote:
Originally Posted by yarrgh View Post
You can reuse the bolts.
Reuse torque to yield bolts? Doesn't sound like a good idea to me. Plus my kids ride in it, I'd rather go longer without something I want/need than put them at risk of being stranded.
smccloud is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:00 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.